(PDF) POWER AMPLIFIER SERVICE MANUAL · module en arriÈre. to prevent electric shock do not remove top or bottom covers. no user serviceable parts inside. refer servicing to qualified - DOKUMEN.TIPS (2023)

Power Base-2 & 800CSL Amplifier Service Manual

1

POWER BASE-2® & 800CSL™

POWER AMPLIFIER

SERVICE MANUAL

K-SVCPB21-95

CSL™ is a trademark and Power Base-2,® ODEP,® and Crown® areregistered trademarks of Crown International, Inc.

Mailing Address:P.O. Box 1000

Elkhart, IN U.S.A. 46515-1000

Shipping Address:57620 C.R. 105

Elkhart, IN U.S.A. 46517

©1995 by CROWN INTERNATIONAL, INC.

Power Base-2 & 800CSL Amplifier Service Manual

2

À PRÉVENIR LE CHOCÉLECTRIQUE N’ENLEVEZPAS LES COUVERTURES.

RIEN DES PARTIESUTILES À L’INTÉRIEUR.

DÉBRANCHER LA BORNEAVANT D’OUVRIR LA

MODULE EN ARRIÈRE.

TO PREVENT ELECTRIC SHOCK DONOT REMOVE TOP OR BOTTOM

COVERS. NO USER SERVICEABLEPARTS INSIDE. REFER SERVICING

TO QUALIFIED SERVICEPERSONNEL. DISCONNECT

POWER CORD BEFORE REMOVINGREAR INPUT MODULE TO ACCESS

GAIN SWITCH.

CAUTION AVIS

WARNINGTO REDUCE THE RISK OF ELECTRIC

SHOCK, DO NOT EXPOSE THISEQUIPMENT TO RAIN OR MOISTURE!

The information furnished in this manual does not include all ofthe details of design, production, or variationsof the equipment.Nor does it cover every possible situation which may arise duringinstallation, operation ormaintenance. If you need specialassistance beyond the scope of this manual, please contact theCrownTechnical Support Group.

Mail: P.O. Box 1000 Elkhart IN 46515-1000Shipping: 57620 C.R.105 Elkhart IN 46517

Phone: (800) 342-6939/(219) 294-8200FAX: (219) 294-8301

Power Base-2 & 800CSL Amplifier Service Manual

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Introduction.............................................................4Scope......................................................................4Warranty..................................................................4Parts........................................................................5Specifications.......................................................... 6VoltageConversion .................................................7Circuit Theory.......................................................... 8TestProcedures ....................................................13Mechanical Parts Listing .......................................17Module Information............................................... 20Q42647-0 OutputModule (MT/MA) ...................... 21Q42717-1 Output Module(MT/MA #2) .................. 22Q42871-6 Output Module (TO-3PMT/MA) ........... 23Q42966-4 Output Module (TO-3P #2)................... 24Q43015-9 Output Module (THC)........................... 25Q43203-1 Output Module (THC #2)...................... 26Q42665-2 Main Module (Original)......................... 27Q42683-5 Main Module (#2)................................. 29Q42818-3 Main Module (3rd Gain)....................... 31Q43059-7 Main Module (THC).............................. 34

Table of Contents

Power Base-2 & 800CSL Amplifier Service Manual

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CrownTechnical Support Group

Factory ServiceParts Department

Mailing Address:PO Box 1000

Elkhart, IN USA 46515-1000

Shipping Address:57620 C.R. 105

Elkhart, IN USA 46517

Phone: (219) 294-8200Toll Free: (800) 342-6939

FAX: (219) 294-8301

This manual contains service information on Crownpoweramplifiers. It is designed to be used in conjunc-tion with theapplicable Owner's Manual. However,some important information isduplicated in this Ser-vice Manual in case the Owner's Manual isnot readilyavailable.

NOTE: THE INFORMATION IN THIS MANUAL IS INTENDEDFOR USE BY ANEXPERIENCED TECHNICIAN ONLY!

SCOPEThis Service Manual includes several sections.Thesesections include Parts Ordering, Specifications, Volt-ageConversion, Circuit Theory, Factory Test Proce-dures, MechanicalParts Lists, and Module Parts Lists.Schematics are attached. Notethat component partswith circuit board comprise a complete module.Mod-ule part numbers are always associated with a spe-cific circuitboard, although an unpopulated circuitboard may be built up withdifferent parts to createdifferent modules. Note that Crown doesnot sell blank(unpopulated) circuit boards.

Each of the compact audio power amplifiers aredesigned forprofessional or commercial use. Provid-ing high power amplificationfrom 20Hz to 20KHz withminimum distortion, they feature balancedinputs withbridged and parallel monophonic capability.Specificfeatures vary depending on model family.

WARRANTYEach Owner's Manual contains basic policies as re-latedto the customer. In addition it should be statedthat this servicedocumentation is meant to be usedonly by properly trained servicepersonnel. Becausemost Crown products carry a 3 Year FullWarranty(including round trip shipping within the UnitedStates),all warranty service should be referred to the CrownFactoryor Authorized Warranty Service Center. Seethe applicable Owner’sManual for warranty details. Tofind the location of the nearestAuthorized ServiceCenter or obtain instructions for receiving CrownFac-tory Service please contact the Crown Technical Sup-port Group(within North America) or your Crown/Amcron Importer (outside NorthAmerica).

Introduction

Power Base-2 & 800CSL Amplifier Service Manual

5

Parts

shipment on a C.O.D. or pre-payment (check or creditcard)basis.

TERMSNormal terms are pre-paid. Net-30 Days applies toonly thosefirms having pre-established accounts withCrown. If pre-paying, theorder must be packed andweighed before a total bill can beestablished, afterwhich an amount due will be issued andshipmentmade upon receipt of pre-payment. New parts re-turned forcredit are subject to a 10% re-stocking fee,and authorization fromthe Crown Parts Departmentmust be obtained before returning partsfor credit.

Crown is not a general parts warehouse. Parts sold bythe CrownParts Department are solely for servicingCrown/Amcron products.Part prices and availabil-ity are subject to change withoutnotice.

GENERAL INFORMATIONLater sections include both mechanical andelectricalparts lists for this product. The parts listed arecurrentas of the date printed. Crown reserves the right tomodifyand improve its products for the benefit of itscustomers.

PART NUMBERING SYSTEMSAs of the printing of this manual, Crownis using twonumbering systems. The elder system always useseightcharacters. The first character is a letter. Com-mon letters usedare C, D, H, M, P, and Q. The secondthrough sixth characters arenumbers. The numbersbuild sequentially (for each prefix letter) asnew partsare added to our parts inventory system. (In somecasesthere will be a space then a four characternumber after the prefixletter; the space is considereda character.) The seventh characteris usually a hy-phen, though it may be a letter to indicate arevision orspecial note. The last character is called acheck-digit,and is useful to Crown for internal tracking.

Crown is in the process of converting to a new partnumbersystem. Length may vary from eight to twelvecharacters. There isstill a letter prefix, then fivenumbers. These five numbersidentify a type of part.The seventh character is a hyphen.Remaining char-acters identify the details of the type of partidentifiedby the first part of the number.

STANDARD AND SPECIAL PARTSMany smaller electrical and electronicparts used byCrown are stocked by and available fromelectronicsupply houses. However, some electronic parts thatappearto be standard are actually special. A partordered from Crown willassure an acceptable re-placement. Structural items such as modulesandpanels are available from Crown only.

ORDERING PARTSWhen ordering parts, be sure to give theproductmodel, and include a description and part number(CPN/DPN)from the parts listing. Price quotes areavailable on request.

SHIPMENTShipment will be normally made by UPS or bestothermethod unless you specify otherwise. Shipments aremade to andfrom Elkhart, Indiana USA, only. Estab-lished accounts with Crownwill receive shipmentfreight prepaid and will be billed. All otherswill receive

CrownParts Department

Mailing Address:PO Box 1000

Elkhart, IN USA 46515-1000

Shipping Address:57620 C.R. 105

Elkhart, IN USA 46517

Phone: (219) 294-8210or: (219) 294-8211

Toll Free: (800) 342-6939FAX: (219) 294-8301

Power Base-2 & 800CSL Amplifier Service Manual

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Specifications

Unless noted otherwise, all specifications are basedon drivingan 8 ohm load per channel, both channelsdriven, the sensitivityswitch in the 26dB position, theAC supply is 120VAC at 60Hz. Crownspecificationsare guaranteed through the warranty period (normally3years). Because our testing methods are more strin-gent than ourpublished specifications, every Crownamplifier will exceed itspublished specifications.

POWERPower8 Ohm Stereo—320W/Ch4 Ohm Stereo—400W/Ch8 Ohm BridgeMono—965W4 Ohm Parallel Mono—680W2 Ohm Parallel Mono—955W

Load Impedances: Rated for 16, 8, 4, and 2 (parallelmono only)Ohm operation; safe with all types of loads,even totally reactiveloads.

AC Mains: 120VAC at 60 Hz with standard 3 wiregrounded 15Aconnector with single voltage trans-former and fan for NorthAmerican units; 100VAC,120VAC, 220VAC, and 240VAC at 50 or 60 Hzwhenequipped with universal transformer, applicable fan,and otherapplicable hardware with country specificpower cord. Note that at50 Hz fan speed is reduced.

PERFORMANCEFrequency Response: ±0.1dB from 20 Hz to 20 kHz at1Watt.

Phase Response: ±10° from 10 Hz to 20 kHz at 1 Watt.

Signal to Noise Ratio: Better than 105 dB (A-weighted)below max.average power from 20 Hz to 20 kHz.

Total Harmonic Distortion (THD): 1000 from 10 Hz to 400 Hz.

DC Offset:

Power Base-2 & 800CSL Amplifier Service Manual

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Voltage Conversion

Note: The only versions of thisproduct produced at theCrownFactory with international volt-age capabilities built in areCSLversions built specifically forsale outside the UnitedStates.

P16P10

P15

P14

P13

P12

P11

P9

P8

P7

P6

P5

P4

P3

P2

P1

P22

P21

P18 P17

P19

P20

F1F100

BRN

BLU

100V Connections:P10 to P15P11 to P14P7 to P12

120V Connections:P10 to P16P11 to P14P7 to P13

220V Connections:P10 to P15P9 to P14P8 to P13

240V Connections:P10 to P16P9 to P14P8 to P13

For list of applicabletransformer, fuse F100,fanformer, andpowercord refer to voltage-parts cross-reference.

S1 Power Switch

PB/CSL Universal Fuse Board

Specific parts are required for the PB-2/800CSL inorder to beused at different international line volt-ages. Refer also toMechanical Parts Lists.

100 to 120V AC Mains:20A Fuse A10285-280.5A Low Voltage SupplyFuse A10285-7Power Transformer (Universal) D 7599-0PowerTransformer (United States) D 6748-4Transmotor 120V 50 HzH43338-5Transmotor 120V 60 Hz H43065-4

220V to 240V AC Mains:10A Fuse A10285-260.5A Low Voltage SupplyFuse A10285-7Power Transformer D 7599-0Transmotor 120V 50HzH43338-5

Power Base-2 & 800CSL Amplifier Service Manual

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Theory

OVERVIEWIt should be noted from the outset that the PB-1and460CSL amplifiers are electrically and mechanicallyidenticalproducts. The only differences, from a ser-vice perspective, arecosmetic. For the purposes ofservicing the products, it should alsobe known thatthe CSL version has been on the market since1992.Since the PB amplifiers have been in production sincethemid-1980’s there are a number of electrical andmechanical partsassociated with the older PB modelsonly. It is also important torealize that over time Crownhas introduced numerous improvements toPB/CSLamplifiers. Though often changes are minor, and aremade for avariety of reasons, a few changes have hada significant impact onthe operation of the circuitry.This manual is up to date as of thetime of writing. Foradditional information regarding theseamplifiers, re-fer to the applicable Technical Notes providedbyCrown for this product.

This section of the manual explains the general opera-tion of atypical Crown power amplifier. Topics cov-ered include Front End,Grounded Bridge, and ODEP.Due to variations in design from vintageto vintage(and similarities with other products Crown) the theoryofoperation remains simplified.

FEATURESPower Base/CSL amplifiers utilize numerousCrowninnovations including grounded bridge and ODEPtechnologies.Cooling techniques make use of thewhat is essentially airconditioner technology. Air flowsbottom to top, and front to side.Air flows a shortdistance across a wide heatsink. This type of airflowprovides significantly better cooling than the “windtunnel”technology used by many other manufactur-ers. Output transistorsare of the metal can type ratherthan plastic case. This allows fora significantly higherthermal margin for the given voltage andcurrentratings. All devices used are tested and graded toensuremaximum reliability. Another electronic tech-nique used is negativefeedback. Almost all poweramplifiers utilize negative feedback tocontrol gainand provide stability, but Crown uses multiplenestedfeedback loops for maximum stability and greatlyimproveddamping. Most Crown amplifiers have damp-ing in excess of 1000 inthe bass frequency range. Thisfeedback, along with our compensationand ultra-lowdistortion output topology, make Crownamplifierssuperior.

Features specific to the Power Base/CSL Series’ in-

clude a single core transformer (one primary with twoindependentungrounded secondaries), a full time fullspeed fan which alsoserves as the low voltagetransformer, slew rate limiting, and audiomuting fordelay or protective action. This amplifier can operateineither a Bridged or Parallel Mono mode as well asdual (stereo). Asensitivity switch allows selection ofinput voltage required forrated output. Level controlsare rear mounted. The only indicatorprovided tells theoperator that the low voltage supply isenergized. Ingeneral, the packaging of this model is designedformaximum watt/price/weight/size value. It is the mostbasicgrounded bridge amplifier series now availablefrom Crown.

For additional details refer to the specification section,or tothe applicable Owner’s Manual.

FRONT END OPERATIONThe front end is comprised of three stages:BalancedGain Stage (BGS), Variable Gain Stage (VGS), andthe ErrorAmp. Figure 1 shows a simplified diagram ofa typical front end withvoltage amplification stages.

Balanced Gain Stage (BGS)Input to the amplifier is balanced. Theshield may beisolated from chassis ground by an RC networktointerrupt ground loops (early models did not have theGround Liftfeature) via the Ground Lift Switch. Thenon-inverting (hot) side ofthe balanced input is fed tothe non-inverting input of the firstop-amp stage. Theinverting (negative) side of the balanced input isfedto the inverting input of the first op-amp stage. Apotentiometeris provided for common mode rejectionadjustment. Electrically, theBGS is at unity gain.(From an audio perspective, however, thisstageactually provides +6dB gain if a fully balanced signalisplaced on its input.) The BGS is a non-invertingstage. It’s outputis delivered to the Variable GainStage.

Variable Gain Stage (VGS)Note: Older models only had two frontend stages.The functions of this stage were combined,primarily,with those of the third.

From the output of the BGS, the signal goes to the VGSwhere gainis determined by the position of the Sen-sitivity Switch, and levelis determined by the levelcontrol. VGS is an inverting stage withthe input beingfed to its op-amp stage. Because gain after thisstageis fixed at 26dB (factor of 20), greater amplifier sensi-

Power Base-2 & 800CSL Amplifier Service Manual

9

Theory

tivity is achieved by controlling the ratio of feedback toinputresistance. The Sensitivity Switch sets the inputimpedance to thisstage and varies the gain such thatthe overall amplifier gain is 26dB, or is adjustedappropriately for 0.775V or 1.4V input to attainratedoutput. Note that earlier models (before main modulesbuiltwith D 7911-7 board) did not support the 1.4Vsensitivity.

Error AmpThe inverted output from the VGS is fed to thenon-inverting input of the Error Amp op-amp stage throughan ACcoupling capacitor and input resistor. Amplifieroutput is fed backvia the negative feedback (NFb)loop resistor. The ratio of feedbackresistor to inputresistor fixes gain from the Error Amp input totheoutput of the amplifier at 26 dB. Diodes preventoverdriving theError Amp. Because the Error Ampamplifies the difference betweeninput and outputsignals, any difference in the two waveformswillproduce a near open loop gain condition which in turnresults inhigh peak output voltage. The output of theError Amp, called theError Signal (ES) drives theVoltage Translators.

VOLTAGE AMPLIFICATIONThe Voltage Translator stage separates theoutput ofthe Error Amp into balanced positive and negativedrivevoltages for the Last Voltage Amplifiers (LVAs),translating thesignal from ground referenced ±15V to±Vcc reference. LVAs providethe main voltage ampli-fication and drive the High Side outputstages. Gainfrom Voltage Translator input to amplifier output isafactor of 25.2.

Voltage TranslatorsA voltage divider network splits the ErrorSignal (ES)into positive and negative drive signals for thebal-anced voltage translator stage. These offset referencevoltagesdrive the input to the Voltage Translatortransistors. A nested NFbloop from the output of theamplifier mixes with the inverted signalriding on theoffset references. This negative feedback fixes gainatthe offset reference points (and the output of the ErrorAmp) at afactor of -25.2 with respect to the amplifieroutput. The VoltageTranslators are arranged in acommon base configuration fornon-inverting voltagegain with equal gain. They shift the audiofrom the±15V reference to VCC reference. Their outputs drivetheirrespective LVA.

Also tied into the Voltage Translator inputs are ODEPlimitingtransistors and control/protection transistors.The ODEP transistorssteal drive as dictated by theODEP circuitry (discussed later). Thecontrol/protec-tion transistors act as switches to totally shuntaudio toground during the turn-on delay, or during a DC/LF orFaultprotective action.

Last Voltage Amplifiers (LVAs)The Voltage Translator stagechannels the signal tothe Last Voltage Amplifiers (LVA's) in abalancedconfiguration. The +LVA and -LVA, with theirpush-pulleffect through the Bias Servo, drive the fullycomple-mentary output stage. The LVAs are configured ascommonemitter amplifiers. This configuration pro-vides sufficient voltagegain and inverts the audio. Thepolarity inversion is necessary toavoid an overallpolarity inversion from input jack to output jack,and it

+

-

+

-

+

-

BGS VGS ErrorAmp

AudioInputs

Vol

tage

Div

ider

NFb Loop

+-ODEP

Mute

+15V

-15V

+VCC

-VCC

NPN Outputs (+HS)

PNP Outputs (-HS)

Q100

Q103

Q121

Q122

Q101

Q102

Q105

Q110

VoltageTranslators

LVA's

Figure 1. Typical Amplifier Front End and Voltage AmplificationStages.

Power Base-2 & 800CSL Amplifier Service Manual

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allows the NFb loop to control Error Amp gain byfeeding back toits non-inverting input (with its polarityopposite to the output ofthe VGS). With the addedvoltage swing provided by the LVAs, thesignal thengains current amplification through theDarlingtonemitter-follower output stage.

GROUNDED BRIDGE TOPOLOGYFigure 2 is a simplified example of thegroundedbridge output topology. It consists of four quadrantsofthree deep Darlington (composite) emitter-followerstages perchannel: one NPN and one PNP on theHigh Side of the bridge (drivingthe load), and oneNPN and one PNP on the Low Side of thebridge(controlling the ground reference for the rails). Theoutputstages are biased to operate class AB+B forultra low distortion inthe signal zero-crossing regionand high efficiency.

High Side (HS)The High Side (HS) of the bridge operates muchlikea conventional bipolar push-pull output configuration.As theinput drive voltage becomes more positive, theHS NPN conducts anddelivers positive voltage to theload. Eventually the NPN devicesreach full conduc-tion and +Vcc is across the load. At this timethe HSPNP is biased off. When the drive signal is negativegoing,the HS PNP conducts to deliver -Vcc to the loadand the HS NPN stageis off.

Theory

+

-

+Vcc (Positive Rail)

-Vcc (Negative Rail)

Load(speaker)

Inputsignal

HIGH SIDE LOW SIDE

Inverting Op-amp

Figure 2. Crown Patented Grounded Bridge Topology

The output of the +LVA drives the base of predriverdevice.Together, the predriver and driver form thefirst two parts of thethree-deep Darlington and arebiased class AB. They provide outputdrive throughthe bias resistor, bypassing the output devices,atlevels below about 100mW. An RLC network betweenthe predriver anddriver provide phase shift compen-sation and limit driver basecurrent to safe levels.Output devices are biased class B, justbelow cutoff.At about 100mW output they switch on to conducthighcurrent to the load. Together with predriver and driver,theoutput device provide an overall class AB+Boutput.

The negative half of the HS is almost identical to thepositivehalf, except that the devices are PNP. Onedifference is that thePNP bias resistor is slightergreater in value so that PNP outputdevices run closerto the cutoff level under static (no signal)conditions.This is because PNP devices require greaterdrivecurrent.

HS bias is regulated by Q18, the Bias Servo. Q18 is aVbemultiplier which maintains approximately 3.3VVce under staticconditions. The positive and negativehalves of the HS output are inparallel with this 3.3V.With a full base-emitter on voltage dropacrosspredrivers and drivers, the balance of voltage resultsinapproximately .35V drop across the bias resistors in

Power Base-2 & 800CSL Amplifier Service Manual

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the positive half, and about .5V across the bias resistorin thenegative half. Q18 conduction (and thus bias) isadjustable.

A diode string prevents excessive charge build upwithin the highconduction output devices when off.Flyback diodes shunt back-EMFpulses from reactiveloads to the power supply to protect outputdevicesfrom dangerous reverse voltage levels. An outputterminatingcircuit blocks RF on output lines fromentering the amplifierthrough its output connectors.

Low Side (LS)The Low Side (LS) operates quite differently.Thepower supply bridge rectifier is not ground refer-enced, nor isthe secondary of the main transformer.In other words, the highvoltage power supply floatswith respect to ground, but ±Vcc remainconstant withrespect to each other. This allows the power supplytodeliver +Vcc and -Vcc from the same bridge rectifierand filter asa total difference in potential, regardlessof their voltages withrespect to ground. The LS usesinverted feedback from the HS outputto control theground reference for the rails (±Vcc). Both LSquad-rants are arranged in a three-deep Darlington and arebiasedAB+B in the same manner as the HS.

When the amplifier output swings positive, the audio isfed to anop-amp stage where it is inverted. Thisinverted signal is delivereddirectly to the bases of thepositive (NPN) and negative (PNP) LSpredrivers. Thenegative drive forces the LS PNP devices on(NPNoff). As the PNP devices conduct, Vce of the PNPDarlingtondrops. With LS device emitters tied toground, -Vcc is pulled towardground reference.Since the power supply is not ground referenced(andthe total voltage from +Vcc to -Vcc is constant) +Vccis forcedhigher above ground potential. This contin-ues until, at thepositive amplifier output peak, -Vcc =0V and +Vcc equals the totalpower supply potentialwith a positive polarity. If, for example,the powersupply produced a total of 70V from rail to rail(±35VDCmeasured from ground with no signal), the amplifieroutputwould reach a positive peak of +70V.

Conversely, during a negative swing of the HS outputwhere HS PNPdevices conduct, the op-amp wouldoutput a positive voltage forcingLS NPN devices toconduct. This would result in +Vcc swingingtowardground potential and -Vcc further from ground poten-tial. Atthe negative amplifier output peak, +Vcc = 0Vand -Vcc equals thetotal power supply potential with

Theory

a negative polarity. Using the same example as above,a 70Vsupply would allow a negative output peak of -70V. In summary, apower supply which produces atotal of 70VDC rail to rail (or ±35VDCstatically) iscapable of producing 140V peak-to-peak at theampli-fier output when the grounded bridge topology isused. Thevoltage used in this example are relativelyclose to the voltages ofthe PB-1/460CSL.

The total effect is to deliver a peak to peak voltage tothespeaker load which is twice the voltage producedby the powersupply. Benefits include full utilization ofthe power supply (itconducts current during bothhalves of the output signal;conventional designsrequire two power supplies per channel, onepositiveand one negative), and never exposing any outputdevice tomore than half of the peak to peak outputvoltage (which does occurin conventional designs).

Low side bias is established by a diode string whichalso shuntsbuilt up charges on the output devices.Bias is adjustable viapotentiometer. Flyback diodesperform the same function as the HSflybacks. Theoutput of the LS is tied directly to chassis groundviaground strap.

OUTPUT DEVICE EMULATION PROTECTION(ODEP)To further protect theoutput stages, a specially devel-oped ODEP circuit is used. Itproduces a complexanalog output signal. This signal is proportionalto thealways changing safe-operating-area margin of theoutputtransistors. The ODEP signal controls the Volt-age Translator stageby removing drive that mayexceed the safe-operating-area of theoutput stage.

ODEP senses output current by measuring the volt-age droppedacross LS emitter resistors. LS NPNcurrent (negative amplifieroutput) and +Vcc aresensed, then multiplied to obtain a signalproportionalto output power. Positive and negative ODEP voltagesareadjustable via two potentiometers. Across ±ODEPare a PTC and athermal sense (current source). ThePTC is essentially a cutoffswitch that causes hardODEP limiting if heatsink temperatureexceeds a safemaximum, regardless of signal level. The thermalsensecauses the differential between +ODEP and –ODEP to decrease asheatsink temperature increases.An increase in positive outputsignal output into a loadwill result in –ODEP voltage dropping; anincrease innegative output voltage and current will cause+ODEPvoltage to drop. A complex RC network between the

Power Base-2 & 800CSL Amplifier Service Manual

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Theory

±ODEP circuitry is used to simulate the thermal barri-ersbetween the interior of the output device die(immeasurable bynormal means) and the time delayfrom heat generation at the dieuntil heat dissipates tothe thermal sensor. The combined effects ofthermalhistory and instantaneous dynamic power level resultin anaccurate simulation of the actual thermal condi-tion of the outputtransistors.

NEGATIVELOW SIDEOUTPUT

PNP STAGE

POSITIVELOW SIDEOUTPUT

NPN STAGE

NEGATIVEHIGH SIDEOUTPUT

PNP STAGE

POSITIVEHIGH SIDEOUTPUT

NPN STAGE

HIGH SIDEBIAS

SERVO

+LVA-1

-LVA-1

+VOLTAGETRANSLATOR

-VOLTAGETRANSLATOR

OUTPUTDEVICE

EMULATIONPROTECTION

ERRORAMP

VGSBGS

BALANCEDINPUTS

INVERTINGBRIDGE

BALANCE

LOW SIDEBIAS

DIODESTRING

-1

-1

MAIN NEGATIVE FEEDBACK (NFb) LOOP

Figure 3. Typical Crown Amplifier Basic Block Diagram (OneChannel Shown)

Power Base-2 & 800CSL Amplifier Service Manual

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Checkout Procedures

GENERAL INFORMATIONThe following test procedures are to be usedto verifyoperation of this amplifier. DO NOT connect a loadorinject a signal unless directed to do so by the proce-dure. Thesetests, though meant for verification andalignment of the amplifier,may also be very helpful introubleshooting. For best results, testsshould beperformed in order.

All tests assume that AC power is from a regulated 120VACsource. Test equipment includes an oscillo-scope, a DMM, a signalgenerator, loads, and I.M.D.and T.H.D. noise test equipment.

STANDARD INITIAL CONDITIONSLevel controls fullyclockwise.Stereo/Mono switch in Stereo.Sensitivity switch in 26 dBfixed gain position.It is assumed, in each step, that conditions oftheamplifier are per these initial conditions unless other-wisespecified.

TEST 1: DC OFFSETSpec: 0 VDC, ±10 mV.Initial Conditions:Controls per standard, inputs shorted.Procedure: Measure DC voltageat the output connec-tors (rear panel). There is no adjustment foroutputoffset. If spec is not met, there is an electricalmalfunc-tion. Slightly out of spec measurement is usually duetoU104/U204 out of tolorance.

TEST 2: OUTPUT BIAS ADJUSTMENTSpec: 300 to 320 mVDC.InitialConditions: Controls per standard, heatsink tem-perature less than40°C.Procedure: Measure DC voltages on the output moduleacross R02,adjust R26 if necessary. Measure DCvoltages on the output moduleacross R21, adjust R23if necessary. Repeat for second channel.

TEST 3: ODEP VOLTAGE ADJUSTMENTSpec: Cold Bias Per Charts Below±0.1V DC.Initial Conditions: Controls per standard, heatsink atroomtemperature 20 to 30°C (68 to 86°F). Note: Thisadjustment shouldnormally be performed within 2minutes of turn on from ambient(cold) conditions. Ifpossible measure heatsink temperature, if notmea-sure ambient room temperature. Use this informationwhenreferencing the chart below. The following is alist of ODEP BiasVoltages VS. Temperature.

°F °C V–ODEP V+ODEP66 18.9 –10.31 11.4168 20.0 –10.26 11.367021.1 –10.20 11.3072 22.2 –10.14 11.2474 23.3 –10.09 11.1976 24.4–10.03 11.1377 25.0 –10.00 11.1078 25.6 –9.97 11.0780 26.7 –9.9111.0182 27.8 –9.86 10.9684 28.9 –9.80 10.9086 30.0 –9.74 10.848831.1 –9.69 10.7990 32.2 –9.63 10.7392 33.3 –9.57 10.6794 34.4 –9.5110.61

–ODEP Procedure: Measure pin 6 of U100 and, ifnecessary, adjustR121 to obtain V–ODEP as specifiedabove. Measure pin 6 of U200 and,if necessary,adjust R221 to obtain V–ODEP as specified above.+ODEPProcedure: Measure pin 6 of U103 and, ifnecessary, adjust R132 toobtain V+ODEP as specifiedabove. Measure pin 6 of U203 and, ifnecessary,adjust R232 to obtain V+ODEP as specified above.

Power Base-2 & 800CSL Amplifier Service Manual

14

TEST 4: AC POWER DRAWSpec: 90 Watts maximum quiescent.InitialConditions: Controls per standard.Procedure: With no input signaland no load, measureAC line wattage draw. If current draw isexcessive,check for high AC line voltage or high bias voltage.

TEST 5: COMMON MODE REJECTIONSpec at 100 Hz: –70 dB.Spec at 20kHz: –50 dB.Initial Conditions: Controls per standard.Procedure: Noload. Inject a 0 dBu 100 Hz sine waveinto each channel, one channelat a time, with invertingand non-inverting inputs shorted together.At theoutput measure less than –44 dBu. Inject a 0 dBu 20kHz sinewave into each channel, one channel at atime, with inverting andnon-inverting inputs shortedtogether. At the output measure lessthan –24 dBu.Adjust R921 or R1021, if necessary, to obtaintherequired measurements. (In older units the adjust-ments are doneusing N100/N200.)

TEST 6: VOLTAGE GAINSpec: ±3% when the Sensitivity Switch is setfor 26dBgain, ±6% when the Sensitivity Switch is set for 0.775Vor1.4V sensitivity.Initial Conditions: Controls perstandard.Procedure: No load connected. Inject a 0.775 VAC 1kHz sinewave with the Sensitivity Switch in the 26 dBposition. Measure 15.5VAC ±0.07 VAC at the ampli-fier output. Inject a 0.775 VAC 1 kHzsine wave with theSensitivity Switch in the 0.775V position.Measure 50.6VAC ±1.5 VAC at the amplifier output. Inject a 1.4 VAC1kHz sine wave with the Sensitivity Switch in the 1.4Vposition.Measure 50.6 VAC ±1.5 VAC at the amplifieroutput. Return theSensitivity Switch to the 26 dBposition.

TEST 7: PHASE RESPONSESpec: ±10° at 1 Watt.Initial Conditions:Controls per standard, 8 ohm load oneach channel.Procedure: Injecta 1 kHz sine wave and adjust for 1Watt output (2.8 VAC). Checkinput and output signalsagainst each other, input and outputsignals must bewithin 10° of each other.

TEST 8: LEVEL CONTROLSSpec: Level controlled by levelcontrols.Initial Conditions: Controls per standard.

Checkout Procedures

Procedure: No Load. Inject a 1 kHz sine wave. Withlevel controlsfully clockwise you should see full gain.As controls are rotatedcounterclockwise, observesimilar gain reduction in each channel.When com-plete, return level controls to fully clockwiseposition.

TEST 9: CURRENT LIMITSpec: Current Limit at 20 ±2 AmpsInitialConditions: Controls per standard.Procedure: Load each channel to 1Ohm. Inject a 1 kHzdifferentiated (or 10% duty cycle) square waveandincrease output level until current limit occurs. Currentlimitshould occur at 20 ±2 Amps. Observe clean (nooscillations) currentclipping.

TEST 10: SLEW RATE & 10 KHZ SQUARE WAVESpec:>13V/µS.Initial Conditions: Controls per standard.Procedure:Load each channel to 8 ohms. Inject a 10kHz square wave to obtain40 volts peak-to-peak ateach output. Observe the slope of thesquare wave. Itshould typically measure 17 to 25 V/µS. Also,thesquare wave must not include overshoot, ringing, orany type ofoscillation.

TEST 11: CROSSTALKSpec:

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Checkout Procedures

Procedure Capacitive: Load each channel to 8 ohms inparallelwith 2 µF. Inject a 20 kHz sine wave with 30VAC output for 10seconds.Procedure Inductive: Load each channel to 8 ohms inparallelwith 159 µHenries. Inject a 1 kHz sine wavewith 15 VAC output for10 seconds.Procedure Torture: Load each channel with theprimary(red and black leads) of a DC-300A transformer (D5781-6).Inject a 10 Hz sine wave at sufficient outputlevel to cause 3 to 5flyback pulses, for 10 seconds.Procedure Short: Inject a 60 Hz sinewave at 5 VAC.After establishing signal, short the output for 10sec-onds.

TEST 14: ODEP LIMITINGSpec: No oscillation on ODEP Limiting waveform;either channel controls limiting in Parallel Mono Mode.InitialConditions: Controls per standard; rag or otherobstruction blockingfan so that it does not turn.Procedure: Load the amplifier to 4ohms on eachchannel. Inject a 60 Hz sine wave and adjust for 35Vrmsat the output. After a few minutes observe a waveform similar toFigure 4. Remove the input signal fromboth channels and allow theamplifier to cool for a fewminutes. Switch the amplifier toParallel Mono andremove the load from Channel 1. Inject the signalintoChannel 1 and observe that ODEP limiting occurs atthe output ofboth channels. Remove the load fromChannel 2, and install the loadon Channel 1. Again,observe that both channels limit. Return allamplifiercontrols to standard initial conditions. Remove thefanobstruction.

TEST 15: LF PROTECTIONSpec: Amplifier mutes for lowfrequency.Initial Conditions: Controls per standard.Procedure: Noload. Inject a 0.5 Hz 6 volt peak-to-peaksquare wave into eachchannel and verify that eachchannel cycles into mute.

TEST 16: SIGNAL TO NOISE RATIOSpec: 100 dB (105 dB A-weighted)below rated 8 ohmpower.Initial Conditions: Controls per standard.Short inputs.Procedure: Load each channel to 8 ohms. Measurelessthan 400 µV at the output of each channel (or –100dB from referenceof +36.25 dBu).

TEST 17: TURN ON TRANSIENTSSpec: No dangerous transients.InitialConditions: Controls per standard.Procedure: From an off condition,turn on the amplifierand monitor the output noise at the time ofturn on.Note: Turn on noise may increase significantly iftheamplifier is cycled off and on.

TEST 18: TURN OFF TRANSIENTSSpec: No dangeroustransients.Initial Conditions: Controls per standard.Procedure:From an on condition, turn off the amplifierand monitor the outputnoise at the time of turn off.Note: Turn off noise may increasesignificantly if theamplifier is cycled off and on.

TEST 19: INTERMODULATION DISTORTIONSpec at 0 dB Output:0.01%.Spec at –35 dB Output: 0.05%.Initial Conditions: Controls perstandard.Procedure: Load each channel to 8 ohms. Inject aSMPTEstandard IM signal (60 Hz and 7 kHz sine wavemixed at 4:1 ratio) at320 Watts (41.0 VAC). With an IManalyzer measure less than 0.01%IMD. Repeat test at–35 dB (reference 320 Watts or 41.0 VAC) andmea-sure less than 0.05% IMD.

TEST 20: CLIPPINGSpec: No protective action during test.InitialConditions: Controls per standard.Procedure: Load each channel to 8ohms. Inject a 1 kHzsine wave at each input and drive output 6 dBinto clipfor 10 seconds. The amplifier should not activateanyprotective circuits (ODEP, Fault, or LF Protection).

Figure 4. ODEP Limiting Wave Form

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Checkout Procedures

POST TESTINGAfter completion of testing, if all tests aresatisfactory,the amplifier controls should be returned to theposi-tions required by customer. If conditions are unknownorunspecified, factory settings are as follows:Level Controls: 9 to11 O’Clock.Sensitivity Switch: 0.775V U.S., 1.4VInternational.Stereo/Mono Switch: Stereo.Ground Lift: Lift.Power:Off.

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Mechanical (Non-Module) Parts

SUPPLIMENTAL ITEMSCPN ITEM QTYD 4137-2 Nylon Thumbscrew Washer4C 3342-0 Feet, Black Self-Stick 4A10087-71012 10-32 .75 Machine(Rack Screw) 4

120VAC/60HZ NORTH AMERICA PRODUCT ONLYCPN ITEM QTYA10089-10832Screw, 8-32 2.0 Ph Machine 4A10285-28 Fuse, 20A 3AB (120V Units)1A10285-7 Fuse, .5A AGC 1.25x.25 (LVPS) 1D 6748-4 PB-2 PowerTransformer 1A10089-10832 Screw, 8-32 2.0 Ph Mach 4A10101-19Washer, Fiber (XFMR Assby) 2H42873-2 Fanformer Assembly 1P10426-8Fuse Board (International Only) 1P10125-6 Fuse Board (U.S. Only)1

FANFORMER MECHANICAL ASSEMBLYCPN ITEM QTYC 7062-0 Screw,6-32-5/16 Flat Mach 2C 9939-7 Fan Blade, 4 inch CCW 1D 8439-8 FanBracket 1

FILTER CAPACITOR MOUNTING ASSEMBLY (ONE PER CHANNEL)CPN ITEMQTYA10095-4 Washer, #10 Ext. Lock 2A10098-5 Belleville SpringWasher 2C 8433-2 C126/C226 10,000µF 110V 1C 8752-5 D117/D217 35A400V Bridge Rectifier 1C 9870-4 Screw, 10-32-.38 Pan 2D 6764-1Washer, Shoulder 2D 8438-0 Bracket, Capacitor Mounting 1

FUSE BOARD ASSEMBLYCPN ITEM QTYC 5060-6 Fuse Clip, PC Mount #9264P10426-8 Fuse Board (International Only) 1P10125-6 Fuse Board(U.S. Only) 1

LED ASSEMBLYCPN ITEM QTYC 4342-9 Enable LED, Amber 1P10068B4 LEDBoard 1

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Mechanical (Non-Module) Parts

OUTPUT ASSEMBLY (ONE PER CHANNEL)CPN ITEM QTYA10100-4 Washer, #6Flat Zinc 2A10315-1 Screw, 6-32-.56 Hex Washer Head 12C 4751-1 NPNOutput Device 4C 5826-0 S100/S200 Thermal Sense LM334Z 1C 6492-0PNP Output Device 4C 7326-9 Solder Lug, #6 Tin 2C 8573-5 PNP DriverDevice TO-3P 2C 8574-3 NPN Driver Device TO-3P 2C 8813-5 Q318/Q418Bias Servo MPSA18/MPS8097 1C 9327-9 Rivet, Plastic 2C 9491-9 Screw,6-32-.312 Taptite Pan Ph 13D 7665-9 Clip, TO-3P Mounting 2D 7666-7Bracket, TO-3P Heatsink 2D 7796-2 Silpad Insulator 1D 7797-0 OutputThru-Hole Pad Insulator 1D 8197-2 Paper Shroud 1D 8264-0 PTCThermal Sensor 1F12019-0 Diode Heatsink Slug 1M21324-5 Heatsink,Aluminum 2

Output Module (See Module List) 1

BACK PANEL ASSEMBLYCPN ITEM QTYA10214-7 Strain Relief (PowerCord) 1C 2823-0 Dual Binding Post Assembly 1D 7074-4 Power Cord(3-14 15A USA) 1M21208J9 Back Panel 1A10019-8 Nut, #8 32-2 Captive2

CHASSIS FRONT ASSEMBLYCPN ITEM QTYA10031-1 Nut, 8-32 Captive4A10090-70806 Screw, 8-32-.375 Mach Ph Oval (Grille) 3A10090-70808Screw, 8-32-.5 Mach Ph Oval 4A10101-5 Washer, Nylon (Grille)3A10110-70605 Screw, 6-32-.312 Taptite Ph (Cover) 20A10173-1 Clip,Grille Filter 3D 6944-9 Air Filter 1D 8465J2 End Cap 2D 8501-5Cover, Top 1D 8548-6 Cover, Bottom 1F11130-6 Front Panel OverlayPB-2 1F11979J5 Front Panel Overlay 800CSL 1F12435J7 Grille 1

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Mechanical (Non-Module) Parts

MAIN CHASSIS ASSEMBLYCPN ITEM QTYA10086-70806 Screw, 8-32-.37Mach Rd Ph 2A10094-3 Washer, #6 Black Star 3A10094-6 Washer, #8Black Star 4A10094-8 Washer, #10 Tooth Lock 10A10099-5 Washer, #8Nylon Shoulder 4A10109-10822 Screw, 8-18-1.375 Pan Ph 2A10110-70812Screw, 8-32-.75 Taptite Pan Ph 2A10192-1 Snap Bushing .5 4C 1811-6Tie Wrap 4C 3163-0 Solder Lug #6 505 1C 6487-0 Power Switch 22ARocker 2 Pole 1C 6912-7 Tension Retainer Board Support 2C 6913-5Spacer Nut, 1 inch 2C 6914-3 Spacer Nut, .75 inch 2C 8341-7 FerriteBead 2C 9491-9 Screw, 6-32-.312 Taptite Pan 4C 9953-8 Screw,6-20-.312 Taptite Pan Black 6D 7600-6 Ground Strap (DBP to Chassis)1D 7784-8 Label, Sensitivity Switch 1D 8002-4 Label, F2 FuseReplacement 1D 8067-7 Label, F1 Fuse Replacement 1F10787J3 BackPanel Plate 1M21082J8 Chassis 1

Main Module (See Module List) 1

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Module Information

MODULE HISTORYSince its introduction in 1986, the PB-1 hasgonethrough a number of updates and revisions. Over thecourse ofits history some of these changes haveresulted in upgrading tonewer modules. What followsis a historical breakdown of PB-1modules. It shouldalso be noted that the 460CSL was introduced in1992and therefor modules obsoleted before that time werenever usedin the CSL version.

OUTPUT MODULES:Q42647-0Original Output Module. No longeravailable.Q42717-1Output Module: 12 resistor small predriver. Lastout-put module for PB-2 for use with TO-220 packagedrivertransistors.Q42871-6TO-3P Driver Output Module. Not for use in THCunits,not retrofittable into TO-220 driver transistorunits.Q42966-4TO-3P Driver #2 Output Module. Not for use inTHCunits, not retrofittable into TO-220 driver transistorunits. Mayreplace this or Q42871-6 only.Q43015-9THC Output Module with TO-3Pdrivers. Not retrofittableto any older units. Does not requirespecial mainmodule for THC ODEP recompensation. Also im-proved biasstability.Q43203-1THC #2 Output Module. Replaces Q42967-2only.Electrically identical, but larger screw head platespreventshorting which could occur with the first THCoutput module.

MAIN MODULES:Q42665-2Original Main Module for PB-2. No longeravailable.Q42683-5Main #2 for PB-2. No longeravailable.Q42818-7Third Gain Main Module. Same circuit board astheuniversal PC board used in MT-600/1200, MA-600/1200, and PB-1(Q42776-7), except that PB-2 re-quired some unique componentvalues. Added thirdgain stage and ground lift switch. Can replaceall oldermodules. Note that if this module is being used toreplacean older module, you may have to slide theground lift switch to theleft (ground lift position) andclip off the plastic switchprotrusion in order for themodule to properly fit in theunit.Q43059-7THC Main Module built on D 7993-5 circuit board.Onthis module the boost circuit has been deleted, thethird position(1.4V) is added to the Sensitivity Switch,and additional faultcircuitry has been added to themodule. Although it is possible tomodify any older unitto accept this module, it is recommended thattheQ42818-7 be used to replace main modules in all olderunits, andthis module be used only as a replacementfor itself.

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Q42647-0 Output Module Parts List (P10137-1 Board)

Q42647-0 Output Module (MT/MA Original) for PB-2:

CAPACITORSC01 C 3978-1 .047µFC02 C 6804-6 .1µFC03 C 6804-6.1µFC04 C 3996-3 .0047µFC05 C 6807-9 .001µFC06 C 6806-1 .01µFC07 C6807-9 .001µFC08 C 6809-5 220pFC09 C 6810-3 180pF

DIODESD01 C 2851-1 1N4004D02 C 2851-1 1N4004D03 C 2851-11N4004D04 C 2851-1 1N4004D05 C 2851-1 1N4004D06 C 2851-1 1N4004D07C 2851-1 1N4004D08 C 2851-1 1N4004D09 C 2851-1 1N4004D10 C 2851-11N4004D11 C 2851-1 1N4004D12 C 2851-1 1N4004

INDUCTORSL00 C 6592-6 Output CoilL01 C 3510-2 470µHL02 C 3510-2470µH

TRANSISTORSQ17 C 3810-6 NPN MPSA43Q19 C 3578-9 PNP MPSA93

RESISTORSR00 A10266-7501 75R01 A10266-4711 470R02 C 7778-1 5.6flame proofR03 C 6486-2 .2 5WR04 C 6486-2 .2 5WR06 C 6486-2 .25WR07 C 6486-2 .2 5WR09 C 7779-9 22 flame proofR10 A10266-4711470R11 A10266-2R73 2.7 1WR12 A10266-2R73 2.7 1WR13 A10266-750175R14 A10266-2R73 2.7 1WR16 C 6486-2 .2 5WR17 C 6486-2 .2 5WR19 C6486-2 .2 5WR20 C 6486-2 .2 5WR21 C 7778-1 5.6 flame proofR22 C7779-9 22 flame proofR23 C 6844-2 250 Pot LS BiasR24 A10266-133113KR25 A10266-2221 2.2KR26 C 6844-2 250 Pot HS BiasR27 A10266-3911390R28 A10266-1331 13KR30* A10265-10201* 102*

MISC.Board P10137-1Jumpers C 5868-2 0 Ohm Jumper (8)Clips D6414-3 Q17/19 Hold DownJ500 J600 C 7057-0 10 Pos. Connector

Note: R30 is 102 Ohms in most units, though in somecases adifferent value may be used to match theinstalled S100/S200 LM334(C5826-0) device grade.This is the standard value and is used withthe mostcommon LM334 grade, green. If the LM334 is markedwith ablue dot, R30 should be a 107 Ohm resistor(A10265-10701); if it ismarked with a yellow dot thenR30 should be a 100 Ohm resistor(A10265-10001).

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Q42717-1 Output Module Parts List (P10233-8 Board)

Q42717-1 Output Module (MT/MA #2) for PB-2:

CAPACITORSC01 C 3978-1 .047µFC02 C 3218-2 .22µFC03 C 3218-2.22µFC04 C 8534-7 .0047µFC05 C 6807-9 .001µFC06 C 6806-1 .01µFC07 C6807-9 .001µFC08 C 6810-3 180pFC09 C 6809-5 220pF

DIODESD01 C 2851-1 1N4004D02 C 2851-1 1N4004D03 C 2851-11N4004D04 C 2851-1 1N4004D05 C 2851-1 1N4004D06 C 2851-1 1N4004D07C 2851-1 1N4004D08 C 2851-1 1N4004D09 C 2851-1 1N4004D10 C 2851-11N4004D11 C 2851-1 1N4004D12 C 2851-1 1N4004

INDUCTORSL00 C 6592-6 Output CoilL01 C 3510-2 470µHL02 C 3510-2470µH

TRANSISTORSQ17 C 3810-6 NPN MPSA43Q19 C 3578-9 PNP MPSA93

RESISTORSR00 A10266-7501 75R01 A10266-4711 470R02 C 7778-1 5.6.5W Flame ProofR03 C 6486-2 .2 5WR04 C 6486-2 .2 5WR05 C 6486-2 .25W

R06 C 6486-2 .2 5WR07 C 6486-2 .2 5WR08 C 6486-2 .2 5WR09 C7779-9 22 .5W Flame ProofR10 A10266-4711 470R11 A10266-2R73 2.71WR12 A10266-1204 12 2WR13 A10266-7501 75R14 A10266-1204 12 2WR15 C6486-2 .2 5WR16 C 6486-2 .2 5WR17 C 6486-2 .2 5WR18 C 6486-2 .25WR19 C 6486-2 .2 5WR20 C 6486-2 .2 5WR21 C 7778-1 5.6 .5W FlameProofR22 C 7779-9 22 .5W Flame ProofR23 C 6844-2 250 Pot LS BiasR24A10266-1331 13KR25 A10266-2221 2.2KR26 C 6844-2 250 Pot HS BiasR27A10266-3911 390R28 A10266-1331 13KR30* A10265-10201* 102*R35A10266-1204 12 2WR36 A10266-1204 12 2WR37 A10266-1204 12 2WR38A10266-1204 12 2WR39 A10266-1204 12 2WR40 A10266-1204 12 2W

MISC.Board P10233-8Jumpers C 5868-2 0 Ohm .25WClips D 6414-3Q17/Q19 Hold DownJ500 J600 C 7057-0 10 Pin Header

Note: R30 is 102 Ohms in most units, though in somecases adifferent value may be used to match theinstalled S100/S200 LM334(C5826-0) device grade.This is the standard value and is used withthe mostcommon LM334 grade, green. If the LM334 is markedwith ablue dot, R30 should be a 107 Ohm resistor(A10265-10701); if it ismarked with a yellow dot thenR30 should be a 100 Ohm resistor(A10265-10001).

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Q42871-6 Output Module (MT/MA TO-3P Driver) for PB-2/800CSL:

CAPACITORSC01 C 8511-5 .047µFC02 C 7964-7 .22µFC03 C 7964-7.22µFC04 C 8534-7 .0047µFC05 C 8534-7 .0047µFC06 C 6806-1 .01µFC07C 6807-9 .001µFC08 C 6810-3 180pFC09 C 6809-5 220pFC43 C 6806-1.01µF

DIODESD01 C 2851-1 1N4004D02 C 2851-1 1N4004D03 C 2851-11N4004D04 C 2851-1 1N4004D05 C 2851-1 1N4004D06 C 2851-1 1N4004D07C 2851-1 1N4004D08 C 2851-1 1N4004D09 C 2851-1 1N4004D10 C 2851-11N4004D11 C 2851-1 1N4004D12 C 2851-1 1N4004

INDUCTORSL00 C 6592-6 1.3µH Output CoilL01 C 3510-2 470µHL02 C3510-2 470µH

TRANSISTORSQ17 C 3810-6 NPN MPSA43/42Q19 C 3578-9 PNP MPSA93

RESISTORSR00 A10266-7501 75R01 A10266-4711 470R02 C 7778-1 5.6flame proofR03 C 6486-2 .2 5WR04 C 6486-2 .2 5WR05 C 6486-2 .25W

R06 C 6486-2 .2 5WR07 C 6486-2 .2 5WR08 C 6486-2 .2 5WR09 C7779-9 22 flame proofR10 A10266-4711 470R11 A10266-2R73 2.7 1WR12A10266-1204 12 2WR13 A10266-7501 75R14 A10266-1204 12 2WR15 C6486-2 .2 5WR16 C 6486-2 .2 5WR17 C 6486-2 .2 5WR18 C 6486-2 .25WR19 C 6486-2 .2 5WR20 C 6486-2 .2 5WR21 C 7778-1 5.6 flameproofR22 C 7779-9 22 flame proofR23 C 6844-2 250 Pot LS BiasR24A10266-1331 13KR25 A10266-2221 2.2KR26 C 6844-2 250 Pot HS BiasR27A10266-3911 390R28 A10266-1331 13KR29 A10266-5101 51R30*A10265-10201* 102*R35 A10266-1204 12 2WR36 A10266-1204 12 2WR37A10266-1204 12 2WR38 A10266-1204 12 2WR39 A10266-1204 12 2WR40A10266-1204 12 2W

MISC.Board P10305-4Jumpers C 5868-2 0 Ohm .25W, Qty 7Clips D6414-3 Q17/Q19 Hold DownBeads C 8341-7 Emitter Q17/Q19J500 J600 C7057-0 10 Pin Header

*Note: R30 is 102 Ohms in most units, though in somecases adifferent value may be used to match theinstalled S100/S200 LM334(C5826-0) device grade.This is the standard value and is used withthe mostcommon LM334 grade, green. If the LM334 is markedwith ablue dot, R30 should be a 107 Ohm resistor(A10265-10701); if it ismarked with a yellow dot thenR30 should be a 100 Ohm resistor(A10265-10001).

Q42871-6 Output Module Parts List (P10305-4 Board)

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Q42966-4 Output Module Parts List (P10305-4 Board)

Q42966-4 Output Module (TO-3P Driver #2) for PB-2/800CSL:

CAPACITORSC01 C 8511-5 .047µFC02 C 7964-7 .22µFC03 C 7964-7.22µFC04 C 8534-7 .0047µFC05 C 6807-9 .001µFC06 C 6806-1 .01µFC07 C6807-9 .001µFC08 C 6810-3 180pFC09 C 6809-5 220pFC43 C 6806-1.01µF

DIODESD01 C 2851-1 1N4004D02 C 2851-1 1N4004D03 C 2851-11N4004D04 C 2851-1 1N4004D05 C 2851-1 1N4004D06 C 2851-1 1N4004D07C 2851-1 1N4004D08 C 2851-1 1N4004D09 C 2851-1 1N4004D10 C 2851-11N4004D11 C 2851-1 1N4004D12 C 2851-1 1N4004

INDUCTORSL00 C 6592-6 Output CoilL01 C 3510-2 470µHL02 C 3510-2470µH

TRANSISTORSQ17 C 3810-6 NPN MPSA43Q19 C 3578-9 PNP MPSA93

RESISTORSR00 A10266-7501 75R01 A10266-4711 470R02 C 7778-1 5.6flame proofR03 C 6486-2 .2 5WR04 C 6486-2 .2 5WR05 C 6486-2 .25W

R06 C 6486-2 .2 5WR07 C 6486-2 .2 5WR08 C 6486-2 .2 5WR09 C7779-9 22 flame proofR10 A10266-4711 470R11 A10266-2R73 2.7 1WR12A10266-1204 12 2WR13 A10266-7501 75R14 A10266-1204 12 2WR15 C6486-2 .2 5WR16 C 6486-2 .2 5WR17 C 6486-2 .2 5WR18 C 6486-2 .25WR19 C 6486-2 .2 5WR20 C 6486-2 .2 5WR21 C 7778-1 5.6 flameproofR22 C 7779-9 22 flame proofR23 C 6844-2 250 Pot LS BiasR24A10266-1331 13KR25 A10266-2221 2.2KR26 C 6844-2 250 Pot HS BiasR27A10266-3911 390R28 A10266-1331 13KR29 A10266-5101 51R30*A10265-10201* 102*R35 A10266-1204 12 2WR36 A10266-1204 12 2WR37A10266-1204 12 2WR38 A10266-1204 12 2WR39 A10266-1204 12 2WR40A10266-1204 12 2W

MISC.Board P10305-4Jumpers C 5868-2 0 Ohm Jumper (7)Clips D6414-3 Q17/19 Hold DownJ500 J600 C 7057-0 10 Pos. ConnectorBEAD C8341-7 Over emitter of Q19

Note: R30 is 102 Ohms in most units, though in somecases adifferent value may be used to match theinstalled S100/S200 LM334(C5826-0) device grade.This is the standard value and is used withthe mostcommon LM334 grade, green. If the LM334 is markedwith ablue dot, R30 should be a 107 Ohm resistor(A10265-10701); if it ismarked with a yellow dot thenR30 should be a 100 Ohm resistor(A10265-10001).

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Q43015-9 Output Module for Through Hole Chassis (THC)PB-2/800CSLunits:

CAPACITORSC01 C 8511-5 .047µFC02 C 7964-7 .22µFC03 C 7964-7.22µFC04 C 8534-7 .0047µFC05 C 8534-7 .0047µFC06 C 6806-1 .01µFC07C 6807-9 .001µFC08 C 6810-3 180pFC09 C 6809-5 220pFC43 C 6806-1.01µF

DIODESD01 C 2851-1 1N4004D02 C 2851-1 1N4004D03 C 2851-11N4004D04 C 2851-1 1N4004D05 C 2851-1 1N4004D06 C 2851-1 1N4004D07C 2851-1 1N4004D08 C 2851-1 1N4004D09 C 2851-1 1N4004D10 C 2851-11N4004D11 C 2851-1 1N4004D12 C 2851-1 1N4004

INDUCTORSL00 C 6592-6 Output CoilL01 C 3510-2 470µHL02 C 3510-2470µH

TRANSISTORSQ17 C 3810-6 NPN MPSA43Q19 C 3578-9 PNP MPSA93

RESISTORSR00 A10266-7501 75R01 A10266-4711 470R02 C 7778-1 5.6.5W Flame ProofR03 C 6486-2 .2 5W

R04 C 6486-2 .2 5WR06 C 6486-2 .2 5WR07 C 6486-2 .2 5WR09 C7779-9 22 .5W Flame ProofR10 A10266-4711 470R11 A10266-2R73 2.71WR12 A10266-1204 12 2WR13 A10266-7501 75R14 A10266-1204 12 2WR16 C6486-2 .2 5WR17 C 6486-2 .2 5WR19 C 6486-2 .2 5WR20 C 6486-2 .25WR21 C 7778-1 5.6 .5W Flame ProofR22 C 7779-9 22 .5W FlameProofR23 C 6844-2 250 Pot LS BiasR24 A10266-1331 13KR25 A10266-22212.2KR26 C 6844-2 250 Pot HS BiasR27 A10266-3911 390R28 A10266-133113KR29 A10266-5101 51R30* A10265-10201* 102*R35 A10266-1204 122WR36 A10266-1204 12 2WR37 A10266-1204 12 2WR38 A10266-1204 122WR39 A10266-1204 12 2WR40 A10266-1204 12 2W

MISC.Board P10341-9Jumpers C 5868-2 0 Ohm (Qty 8)Clips D 6414-3Q17/Q19 Hold DownJ500 J600 C 7057-0 10 Pin Header

*Note: R30 is 102 Ohms in most units, though in somecases adifferent value may be used to match theinstalled S100/S200 LM334(C5826-0) device grade.This is the standard value and is used withthe mostcommon LM334 grade, green. If the LM334 is markedwith ablue dot, R30 should be a 107 Ohm resistor(A10265-10701); if it ismarked with a yellow dot thenR30 should be a 100 Ohm resistor(A10265-10001).

Q43015-9 Output Module Parts List (P10341-9 Board)

Power Base-2 & 800CSL Amplifier Service Manual

26

Q43203-1 Output Module (THC #2) for PB-2/800CSL Units:

CAPACITORSC01 C 8511-5 .047µFC02 C 7964-7 .22µFC03 C 7964-7.22µFC04 C 8534-7 .0047µFC05 C 8534-7 .0047µFC06 C 6806-1 .01µFC07C 6807-9 .001µFC08 C 6810-3 180pFC09 C 6809-5 220pFC43 C 6806-1.01µF

DIODESD01 C 2851-1 1N4004D02 C 2851-1 1N4004D03 C 2851-11N4004D04 C 2851-1 1N4004D05 C 2851-1 1N4004D06 C 2851-1 1N4004D07C 2851-1 1N4004D08 C 2851-1 1N4004D09 C 2851-1 1N4004D10 C 2851-11N4004D11 C 2851-1 1N4004D12 C 2851-1 1N4004

INDUCTORSL00 C 6592-6 Output CoilL01 C 3510-2 470µHL02 C 3510-2470µH

TRANSISTORSQ17 C 3810-6 NPN MPSA43Q19 C 3578-9 PNP MPSA93

RESISTORSR00 A10266-7501 75R01 A10266-4711 470R02 C 7778-1 5.6.5W Flame ProofR03 C 6486-2 .2 5W

R04 C 6486-2 .2 5WR06 C 6486-2 .2 5WR07 C 6486-2 .2 5WR09 C7779-9 22 .5W Flame ProofR10 A10266-4711 470R11 A10266-2R73 2.71WR12 A10266-1204 12 2WR13 A10266-7501 75R14 A10266-1204 12 2WR16 C6486-2 .2 5WR17 C 6486-2 .2 5WR19 C 6486-2 .2 5WR20 C 6486-2 .25WR21 C 7778-1 5.6 .5W Flame ProofR22 C 7779-9 22 .5W FlameProofR23 C 6844-2 250 Pot LS BiasR24 A10266-1331 13KR25 A10266-22212.2KR26 C 6844-2 250 Pot HS BiasR27 A10266-3911 390R28 A10266-133113KR29 A10266-5101 51R30* A10265-10201* 102*R35 A10266-1204 122WR36 A10266-1204 12 2WR37 A10266-1204 12 2WR38 A10266-1204 122WR39 A10266-1204 12 2WR40 A10266-1204 12 2W

MISC.Board P10397-1Jumpers C 5868-2 0 Ohm (Qty 7)Clips D 6414-3Q17/Q19 Hold DownJ500 J600 C 7057-0 10 Pin Header

*Note: R30 is 102 Ohms in most units, though in somecases adifferent value may be used to match theinstalled S100/S200 LM334(C5826-0) device grade.This is the standard value and is used withthe mostcommon LM334 grade, green. If the LM334 is markedwith ablue dot, R30 should be a 107 Ohm resistor(A10265-10701); if it ismarked with a yellow dot thenR30 should be a 100 Ohm resistor(A10265-10001).

Q43203-1 Output Module Parts List (P10397-1 Board)

Power Base-2 & 800CSL Amplifier Service Manual

27

Q42665-2 Main Module Parts List (D 6910-0 Board)

Q42665-2 Main Module (Original) for PB-2:

CAPACITORSC1 C 4303-1 1000uFC2 C 3913-8 470uFC3 C 4303-11000uFC4 C 6802-0 .47uFC100 C200 C 5311-3 22uFC101 C201 C 2821-410pFC103 C203 C 6805-3 .022uFC104 C204 C 6805-3 .022uFC105 C205 C6950-7 82pFC106 C206 C 6950-7 82pFC108 C208 C 6812-9 47pFC112 C212C 6803-8 .12uFC113 C213 C 6802-0 .47uFC114 C214 C 3729-8 100uF16VC115 C215 C 3729-8 100uF 16VC116 C216 C 6802-0 .47uFC117 C217 C6803-8 .12uFC118 C218 C 6812-9 47pFC122 C222 C 6811-1 100pFC123C223 C 6811-1 100pFC124 C224 C 6809-5 220pFC125 C225 C 3729-8 100uF16VC127 C227 C 3729-8 100uF 16VC128 C228 C 6803-8 .12uFC133 C233 C6814-5 12pFC134 C234 C 6805-3 .022uFC135 C235 C 6805-3 .022uFC136C236 C 6808-7 470pFC137 C237 C 6808-7 470pFC138 C238 C 6814-512pFC139 C239 C 6814-5 12pFC140 C240 C 6812-9 47pFC141 C241 C6812-9 47pF

C242 C 5162-0 3-12pF Trim

DIODESD1 C 2851-1 1N4004D2 C 2851-1 1N4004D3 C 2851-1 1N4004D4 C2851-1 1N4004D5 C 2851-1 1N4004D6 C 2851-1 1N4004D7 C 2851-11N4004D104 D204 C 2851-1 1N4004D105 D205 C 2851-1 1N4004D106 D206 C2851-1 1N4004D107 D207 C 2851-1 1N4004D108 D208 C 3181-2 1N4148D109D209 C 3181-2 1N4148

D110 D210 C 3181-2 1N4148D111 D211 C 5061-4 1N3070D112 D212 C3181-2 1N4148D113 D213 C 3181-2 1N4148D114 D214 C 3181-2 1N4148D115D215 C 3181-2 1N4148D120 D220 C 3181-2 1N4148D121 D221 C 3181-21N4148D122 D222 C 3181-2 1N4148D123 D223 C 5061-4 1N3070

NETWORK RESISTORSN100 N200 D 4669-4 Balanced Input TrimN101 N201D 6081-0 Resistor Network-BN102 N202 D 6082-8 ResistorNetwork-C

TRANSISTORSQ100 Q200 D 2961-7 SEL 2N3859AQ101 Q201 C 3578-9MPSA93Q102 Q202 C 3810-6 MPSA43/A42Q103 Q203 C 3786-8 PN4250AQ104Q204 C 3625-8 2N4125Q105 Q205 C 3578-9 MPSA93Q106 Q206 C 3625-82N4125Q107 Q207 C 3786-8 PN4250AQ108 Q208 D 2961-7 SEL 2N3859AQ109Q209 D 2961-7 SEL 2N3859AQ110 Q210 C 3810-6 MPSA43/A42Q111 Q211 D2961-7 SEL 2N3859AQ112 Q212 C 3625-8 2N4125Q113 Q213 C 3625-82N4125Q115 Q215 D 2962-5 MPS8097Q116 Q216 C 3786-8 PN4250AQ117 Q217D 2961-7 SEL 2N3859AQ118 Q218 D 2961-7 SEL 2N3859AQ119 Q219 C3625-8 2N4125Q120 Q220 C 3625-8 2N4125

RESISTORSR1 A10265-10031 100K 1%R5 A10266-3323 3.3K 1WR100 R200C 6893-9 5K POTR101 R201 A10265-49911 4.99KR102 R202 A10266-10211KR103 R203 A10265-10031 100K 1%R104 R204 A10266-2721 2.7KR105 R205A10266-2721 2.7KR106 R206 A10266-1231 12KR107 R207 A10266-473147KR108 R208 A10266-1021 1KR109 R209 A10266-8201 82 OHMR110 R210A10266-4731 47K

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R111 R211 A10266-1231 12KR112 R212 A10266-5131 51KR113 R213A10266-4721 4.7KR114 R214 A10266-4721 4.7KR115 R215 A10266-5141510KR116 R216 A10266-3351 3.3MR117 R217 A10266-4731 47KR118 R218A10266-2711 270 OHMR119 R219 A10266-3011 300 OHMR120 R220A10266-2711 270 OHMR121 R221 C 5062-2 100K TRIMMERR122 R222A10266-2741 270KR123 R223 A10266-1232 12K .5WR124 R224 A10266-68216.8KR125 R225 C 7782-3 100 OHMR126 R226 C 7782-3 100 OHMR127 R227A10266-6821 6.8KR128 R228 A10266-1031 10KR129 R229 A10266-1041100KR130 R230 A10266-1041 100KR131 R231 A10266-1031 10KR132 R232 C5062-2 100K TRIMMERR133 R233 A10266-2741 270KR134 R234 A10266-123212K .5WR135 R235 C 7782-3 100 OHMR136 R236 A10266-6821 6.8KR137R237 C 7782-3 100 OHMR138 R238 A10266-6821 6.8KR139 R239A10266-1021 1KR140 R240 A10266-8201 82 OHMR141 R241 A10266-1541150KR142 R242 A10266-1541 150KR146 R246 A10266-1031 10KR147 R247 C7781-5 200 OHMR148 R248 A10266-2721 2.7KR149 R249 C 7781-5 200OHMR150 R250 A10266-2721 2.7KR151 R251 A10266-1031 10KR152 R252A10266-1231 12KR154 R254 A10266-1011 100 OHMR156 R256 A10266-13211.3KR157 R257 A10266-1321 1.3KR158 R258 A10266-9121 9.1KR159 R259A10266-1031 10K

R161 R261 A10266-4701 47 OHMR162 R262 A10266-4701 47 OHMR165R265 A10265-53611 5.36K 1%R146 R246 A10265-53611 5.36K 1%R167 R267A10266-1021 1KR168 R268 A10265-95301 953 OHMR170 R270 A10266-10211KR171 R271 A10265-95301 953 OHM

SWITCHESS3 C 6841-8 4PDTS100 C 6781-6 6P3T

IC’SU1 C 5095-2 MC7815U2 C 5096-0 MC7915U100 U200 C 6911-9 UPA75PNPU103 U203 C 6910-1 UPA76 NPNU104 U204 C 6900-2 MC34084P

MISC.BOARD D 6304B2J1 C 7593-4 5 PIN HEADERJ2 C 4508-5 16 PINSOCKETJ9 C 7527-2 6 PIN HEADERJ10 C 7592-6 4 PIN HEADERJ11 C 7077-8WIRE RETAINERJ100 J200 C 6777-4 PHONE JACKJ500 J800 D 6619-7 10"RIBBON ASSYJ600 J700 D 6620-5 6" RIBBON ASSYMOUNTS U1, U2:

(2) C 1889-2 6-32 NUT(2) C 2176-3 6-32 X .5 SCREW(2) C 5341-0HEATSINK(2) C 5594-4 STAR WASHER

MOUNTS U104, U204:(2) C 3450-1 14 Pin Socket

COVERS FOR J100, J200:(2) C 6778-2 Cover, Phone Jack

Additional Parts(1) C 7077-8 3-Cond Wire Retain

Q42665-2 Main Module Parts List (D 6910-0 Board)

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29

Q42683-5 Main Module Parts List (D 6910-0 Board)

Q42683-5 Main Module (#2) for PB-2:

CAPACITORSC1 C 3913-8 470uFC2 C 3913-8 470uFC3 C 4303-1 1000uFC4C 6802-0 .47uFC100 C200 C 5311-3 22uFC101 C201 C 2820-6 5pFC103C203 C 6805-3 .022uFC104 C204 C 6805-3 .022uFC105 C205 C 6812-947pFC106 C206 C 6812-9 47pFC108 C208 C 6814-5 12pFC112 C212 C6803-8 .12uFC113 C213 C 6802-0 .47uFC114 C214 C 3729-8 100uF16VC115 C215 C 3729-8 100uF 16VC116 C216 C 6802-0 .47uFC117 C217 C6803-8 .12uFC118 C218 C 6814-5 12pFC122 C222 C 6811-1 100pFC123C223 C 6812-9 47pFC124 C224 C 6812-9 47pFC125 C225 C 3729-8 100uF16VC127 C227 C 3729-8 100uF 16VC128 C228 C 7706-2 .1uFC130 C 6814-512pFC133 C233 C 6814-5 12pFC134 C234 C 6805-3 .022uFC135 C235 C6805-3 .022uFC136 C236 C 6808-7 470pFC137 C237 C 6808-7 470pFC138C238 C 6814-5 12pFC139 C239 C 6814-5 12pFC140 C240 C 6812-947pFC141 C241 C 6812-9 47pF

C242 C 5162-0 3-12pF TrimC144 C244 C 5362-6 2.2uFC145 C245 C6814-5 12pFC146 C246 C 6809-5 220pFC147 C247 C 6806-1 .01uFC148C248 C 6810-3 180pFC149 C249 C 6808-7 470pFC152 C252 C 6809-5220pFC153 C253 C 5362-6 2.2uF

DIODESD1 C 2851-1 1N4004D2 C 2851-1 1N4004D3 C 2851-1 1N4004D4 C2851-1 1N4004

D5 C 2851-1 1N4004D6 C 2851-1 1N4004D7 C 2851-1 1N4004D104 D204C 2851-1 1N4004D105 D205 C 2851-1 1N4004D106 D206 C 2851-11N4004D107 D207 C 2851-1 1N4004D108 D208 C 3181-2 1N4148D109 D209 C3181-2 1N4148D110 D210 C 3181-2 1N4148D111 D211 C 5061-4 1N3070D112D212 C 3181-2 1N4148D113 D213 C 3181-2 1N4148D114 D214 C 3181-21N4148D115 D215 C 3181-2 1N4148D120 D220 C 3181-2 1N4148D121 D221 C3181-2 1N4148D122 D222 C 3181-2 1N4148D123 D223 C 5061-4 1N3070

NETWORK RESISTORSN100 N200 D 4669-4 Balanced Input TrimN101 N201D 6081-0 Resistor Network-BN102 N202 D 6082-8 ResistorNetwork-C

TRANSISTORSQ100 Q200 D 2961-7 SEL 2N3859AQ101 Q201 C 3578-9MPSA93Q102 Q202 C 3810-6 MPSA43/A42Q103 Q203 C 3786-8 PN4250AQ104Q204 C 3625-8 2N4125Q105 Q205 C 3578-9 MPSA93Q106 Q206 C 3625-82N4125Q107 Q207 C 3786-8 PN4250AQ108 Q208 D 2961-7 SEL 2N3859AQ109Q209 D 2961-7 SEL 2N3859AQ110 Q210 C 3810-6 MPSA43/A42Q111 Q211 D2961-7 SEL 2N3859AQ112 Q212 C 3625-8 2N4125Q113 Q213 C 3625-82N4125Q115 Q215 D 2962-5 MPS8097Q116 Q216 C 3786-8 PN4250AQ117 Q217D 2961-7 SEL 2N3859AQ118 Q218 D 2961-7 SEL 2N3859AQ119 Q219 C3625-8 2N4125Q120 Q220 C 3625-8 2N4125Q121 Q221 C 3786-8PN4250A

RESISTORSR1 A10265-53621 53.6K 1%R4 A10265-46421 46.4K 1%R5A10266-3323 3.3K 1W

Power Base-2 & 800CSL Amplifier Service Manual

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R100 R200 C 7409-3 5K POTR101 R201 A10265-49911 4.99KR102 R202A10266-1021 1KR103 R203 A10265-10031 100K 1%R104 R204 A10266-27212.7KR105 R205 A10266-2721 2.7KR106 R206 A10266-1231 12KR107 R207A10266-6831 68KR108 R208 A10266-1021 1KR109 R209 A10266-8201 82OHMR110 R210 A10266-6831 68KR111 R211 A10266-1231 12KR112 R212A10266-5131 51KR113 R213 A10266-4721 4.7KR114 R214 A10266-47214.7KR115 R215 A10266-5141 510KR116 R216 A10266-3351 3.3MR117 R217A10266-4731 47KR118 R218 A10266-2711 270 OHMR119 R219 A10266-3011300 OHMR120 R220 A10266-2711 270 OHMR121 R221 C 5062-2 100KTRIMMERR122 R222 A10266-2741 270KR123 R223 A10266-1232 12K .5WR124R224 A10266-6821 6.8KR125 R225 C 7782-3 100 OHMR126 R226 C 7782-3100 OHMR127 R227 A10266-6821 6.8KR128 R228 A10266-1031 10KR129 R229A10266-1041 100KR130 R230 A10266-1041 100KR131 R231 A10266-103110KR132 R232 C 5062-2 100K TRIMMERR133 R233 A10266-2741 270KR134R234 A10266-1232 12K .5WR135 R235 C 7782-3 100 OHMR136 R236A10266-6821 6.8KR137 R237 C 7782-3 100 OHMR138 R238 A10266-68216.8KR139 R239 A10266-1021 1KR140 R240 A10266-8201 82 OHMR141 R241A10266-1541 150KR142 R242 A10266-1541 150KR146 R246 A10266-103110KR147 R247 C 7781-5 200 OHMR148 R248 A10266-2721 2.7KR149 R249 C7781-5 200 OHMR150 R250 A10266-2721 2.7KR151 R251 A10266-103110KR152 R252 A10266-1231 12KR153 R253 C 5869-2 ZERO OHMR156 R256A10266-1321 1.3KR157 R257 A10266-1321 1.3K

R158 R258 A10266-9121 9.1KR159 R259 A10266-1031 10KR161 R261A10266-4701 47 OHMR162 R262 A10266-4701 47 OHMR167 R267 A10266-10211KR168 R268 A10265-95301 953 OHMR170 R270 A10266-1021 1KR171 R271A10265-95301 953 OHMR174 R274 A10265-38311 3.83K 1%R175 R275A10265-16911 1.69K 1%R176 R276 A10266-1041 100KR177 R277 C 5062-2TRIM POTR178 R278 A10266-1231 12KR179 R279 A10266-4731 47KR180 R280A10266-4711 470 OHMR181 R281 A10266-4721 4.7KR182 R282 A10266-220122 OHMR183 R283 A10266-2051 2M

SWITCHESS3 C 7363-2 4PDTS100 C 6781-6 6P3T

IC’SU1 C 5095-2 MC7815U2 C 5096-0 MC7915U100 U200 C 6911-9 UPA75PNPU103 U203 C 6910-1 UPA76 NPNU104 U204 C 6900-2 MC34084P

INTERCONNECTSJ2 C 4508-5 16 PIN SOCKETJ9 C 7527-2 6 PINHEADERJ10 C 7592-6 4 PIN HEADERJ11 C 7526-4 3 PIN HEADERJ100 J200 C6777-4 PHONE JACKJ500 J800 D 6619-7 10" RIBBON ASSYJ600 J700 D6620-5 6" RIBBON ASSY

MISC.BOARD D 6910-0MOUNTS U1, U2:

(2) C 1889-2 6-32 NUT(2) C 2176-3 6-32 X .5 SCREW(2) C 5341-0HEATSINK(2) C 5594-4 STAR WASHER

MOUNTS U104, U204:(2) C 3450-1 14 PIN SOCKET

COVERS FOR J100, J200:(2) C 6778-2 Phone Jack Cover

STRAIN RELIEF:(4) C 1811-6 CABLE TIE

Q42683-5 Main Module Parts List (D 6910-0 Board)

Power Base-2 & 800CSL Amplifier Service Manual

31

Q42818-7 Main Module Parts List (D 7251-8 Board)

Q42818-7 Main Module (3rd Gain) for PB-2/800CSL:

CAPACITORSC1 C 3913-8 470uFC2 C 3913-8 470uFC4 C 6802-0 .47uFC5C 6806-1 .01uFC6 C 6806-1 .01uFC7 C 6094-9 33uFC8 C 6806-1.01uFC100 C200 C 5311-3 22uFC101 C201 C 2820-6 5pFC103 C203 C6805-3 .022uFC104 C204 C 6804-6 .1uFC105 C205 C 6812-9 47pFC106C206 C 6812-9 47pFC108 C208 C 6814-5 12pFC112 C212 C 6803-8.12uFC113 C213 C 6802-0 .47uFC114 C214 C 8026-4 100uF 35VC115 C215C 8026-4 100uF 35VC116 C216 C 6802-0 .47uFC117 C217 C 6803-8.12uFC118 C218 C 6814-5 12pFC122 C222 C 6811-1 100pFC123 C223 C6812-9 47pFC124 C224 C 6812-9 47pFC125 C225 C 8026-4 100uF 35VC127C227 C 8026-4 100uF 35VC128 C228 C 7706-2 .1uF 100VC130 C230 C6813-7 27pFC133 C233 C 6814-5 12pFC134 C234 C 6805-3 .022uFC135C235 C 6805-3 .022uFC136 C236 C 6808-7 470pFC137 C237 C 6808-7470pFC138 C238 C 6814-5 12pFC139 C239 C 6814-5 12pFC140 C240 C6812-9 47pFC141 C241 C 6812-9 47pFC144 C244 C 8026-4 100uF 35VC145C245 C 6814-5 12pFC146 C246 C 6809-5 220pFC147 C247 C 6806-1.01uFC148 C248 C 6810-3 180pFC 149 C249 C 6808-7 470pFC152 C252 C6809-5 220pFC153 C253 C 6804-6 .1uF

DIODESD1 C 2851-1 1N4004D2 C 2851-1 1N4004D3 C 2851-1 1N4004D4 C2851-1 1N4004D5 C 2851-1 1N4004D6 C 2851-1 1N4004D7 C 2851-11N4004D8 C 3181-2 1N4148D9 C 3549-0 1N916B 10VD104 D204 C 2851-11N4004D105 D205 C 2851-1 1N4004D106 D206 C 2851-1 1N4004D107 D207 C2851-1 1N4004D108 D208 C 3181-2 1N4148D109 D209 C 3181-2 1N4148D110D210 C 3181-2 1N4148D111 D211 C 5061-4 1N3070D112 D212 C 3181-21N4148D113 D213 C 3181-2 1N4148D114 D214 C 3181-2 1N4148D115 D215 C3181-2 1N4148D120 D220 C 3181-2 1N4148D121 D221 C 3181-2 1N4148D122D222 C 3181-2 1N4148D123 D223 C 5061-4 1N3070D124 D224 C 5061-41N3070

NETWORK RESISTORSN100 N200 D 4669-4 Balanced Input TrimN101 N201D 6081-0 Resistor Network-BN102 N202 D 6082-8 ResistorNetwork-C

TRANSISTORSQ1 C 7458-0 2N4123Q2 C 3625-8 2N4125Q100 Q200 D2961-7 SEL 2N3859AQ101 Q201 C 3578-9 MPSA93Q102 Q202 C 3810-6MPSA43/A42Q103 Q203 C 3786-8 PN4250AQ104 Q204 C 3625-8 2N4125Q105Q205 C 3578-9 MPSA93Q106 Q206 C 3625-8 2N4125Q107 Q207 C 3786-8PN4250AQ108 Q208 D 2961-7 SEL 2N3859AQ109 Q209 D 2961-7 SEL2N3859AQ110 Q210 C 3810-6 MPSA43/A42Q111 Q211 D 2961-7 SEL2N3859AQ112 Q212 C 3625-8 2N4125Q113 Q213 C 3625-8 2N4125Q115 Q215D 2962-5 MPS8097

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Q116 Q216 C 3786-8 PN4250AQ117 Q217 D 2961-7 SEL 2N3859AQ118Q218 D 2961-7 SEL 2N3859AQ119 Q219 C 3625-8 2N4125Q120 Q220 C3625-8 2N4125Q121 Q221 C 7458-0 2N4123Q122 Q222 C 7458-0 2N4123

RESISTORSR1 A10265-53621 53.6KR2 A10266-2402 24 OHMR3A10266-2402 24 OHMR4 A10265-46421 46.4KR5 A10266-3321 3.3KR11A10266-5621 5.6KR12 A10266-4331 43KR13 A10266-1021 1KR14A10266-8221 8.2KR15 A10266-6211 620 OHMR101 R201 A10265-499114.99KR102 R202 A10266-1021 1KR103 R203 A10266-1041 100KR104 R204A10266-2721 2.7KR105 R205 A10266-2721 2.7KR106 R206 A10266-123112KR107 R207 A10266-6831 68KR108 R208 A10266-1021 1KR109 R209A10266-8201 82 OHMR110 R210 A10266-6831 68KR111 R211 A10266-123112KR112 R212 A10266-5131 51KR113 R213 A10266-4721 4.7KR114 R214A10266-4721 4.7KR115 R215 A10266-5141 510KR116 R216 A10266-33513.3MR117 R217 A10266-4731 47KR118 R218 A10266-2711 270 OHMR119 R219A10266-3011 300 OHMR120 R220 A10266-2711 270 OHMR121 R221 C 5062-2100K TRIMMERR122 R222 A10266-2741 270KR123 R223 A10266-1231 12KR124R224 A10266-6821 6.8KR125 R225 C 7782-3 100 OHMR126 R226 C 7782-3100 OHMR127 R227 A10266-6821 6.8KR128 R228 A10266-1031 10KR129 R229A10266-1041 100KR130 R230 A10266-1041 100KR131 R231 A10266-103110KR132 R232 C 5062-2 100K TRIMMERR133 R233 A10266-2741 270K

R134 R234 A10266-1231 12KR135 R235 C 7782-3 100 OHMR136 R236A10266-6821 6.8KR137 R237 C 7782-3 100 OHMR138 R238 A10266-68216.8KR139 R239 A10266-1021 1KR140 R240 A10266-8201 82 OHMR141 R241A10266-1541 150KR142 R242 A10266-1541 150KR146 R246 A10266-103110KR147 R247 C 7781-5 200 OHMR148 R248 A10266-2721 2.7KR149 R249 C7781-5 200 OHMR150 R250 A10266-2721 2.7KR151 R251 A10266-103110KR152 R252 A10266-1231 12KR153 R253 C 5868-2 ZERO OHMR156 R256A10266-1321 1.3KR157 R257 A10266-1321 1.3KR158 R258 A10266-91219.1KR159 R259 A10266-1031 10KR161 R261 A10266-4701 47 OHMR162 R262A10266-4701 47 OHMR167 R267 A10266-1021 1KR168 R268 A10265-95301953 OHMR170 R270 A10266-1021 1KR171 R271 A10265-95301 953 OHMR174R274 A10265-24921 24.9KR175 R275 A10265-14721 14.7KR176 R276A10265-24921 24.9KR179 R279 A10266-4731 47KR180 R280 A10266-4711470 OHMR181 R281 A10266-4721 4.7KR182 R282 A10266-2201 22 OHMR183R283 A10266-2421 2.4KR185 R285 A10266-2421 2.4KR186 R286A10266-1051 1MR187 R287 A10265-52321 52.3K

SWITCHESS2 C 7325-1 DPDT SIDES3 C 7363-2 DPDT GOLDS100 C 6781-66P3T

IC’SU1 C 5095-2 MC7815U2 C 5096-0 MC7915U100 U200 C 6911-9 UPA75PNPU103 U203 C 6910-1 UPA76 NPNU104 U204 C 6900-2 MC34084P

Q42818-7 Main Module Parts List (D 7251-8 Board)

Power Base-2 & 800CSL Amplifier Service Manual

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INTERCONNECTSJ1 C 7593-4 HEADER 5 PINJ2 C 4508-5 16 PIN SOCKETJ9C 7527-2 HEADER 6 PINJ10 C 7592-6 HEADER 4 PINJ11 C 7526-4 HEADER 3PINJ100 J200 C 6777-4 PHONE JACKJ500 J800 D 6619-7 10" RIBBONASSYJ600 J700 D 6620-5 6" RIBBON ASSY

MISC.BOARD D 7251-8MOUNTS U1, U2:

(2) C 1889-2 6-32 NUT(2) C 2176-3 6-32 X .5 SCREW(2) C 5341-0HEATSINK(2) C 5594-4 STAR WASHER

MOUNTS U104, U204:(2) C 3450-1 14 PIN SOCKET

COVERS FOR J100, J200:(2) C 6778-2 Phone Jack Cover

STRAIN RELIEF:(4) C 1811-6 CABLE TIE

Q42818-7 Main Module Parts List (D 7251-8 Board)

Power Base-2 & 800CSL Amplifier Service Manual

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Q43059-7 Applicability: Main Module for Through HoleChassis(THC) PB-2/800CSL units.

CAPACITORSC1 C 4303-1 1000µFC2 C 3913-8 470µFC4 C 6802-0 .47µFC5C 6806-1 .01µFC6 C 6806-1 .01µFC7 C 8897-8 .1µFC100 C200 C 5311-322µFC101 C201 C 2821-4 10pFC103 C203 C 6805-3 .022µFC104 C204 C6805-3 .022µFC105 C205 C 6812-9 47pFC106 C206 C 6812-9 47pFC107C207 C 8897-8 .1µFC108 C208 C 6814-5 12pFC109 C209 C 7417-6.0033µFC110 C210 C 5362-6 2.2µFC111 C211 C 8897-8 .1µFC112 C212 C6803-8 .12µFC113 C213 C 8991-9 .47µFC114 C214 C 8854-9 100µFC115C215 C 8854-9 100µFC116 C216 C 8991-9 .47µFC117 C217 C 6803-8.12µFC118 C218 C 6814-5 12pFC119 C219 C 6802-0 .47µFC120 C220 C8897-8 .1µFC122 C222 C 6811-1 100pFC123 C223 C 6812-9 47pFC124 C224C 6812-9 47pFC129 C229 C 6814-5 12pFC130 C230 C 6813-7 27pFC133C233 C 6813-7 27pFC134 C234 C 6805-3 .022µFC135 C235 C 6805-3.022µFC136 C236 C 6808-7 470pFC137 C237 C 6808-7 470pFC138 C238 C6813-7 27pFC139 C239 C 6813-7 27pFC140 C240 C 6812-9 47pFC141 C241C 6812-9 47pFC144 C244 C 8576-8 100µFC145 C245 C 6812-9 47pFC146C246 C 6812-9 47pFC147 C247 C 6806-1 .01µFC148 C248 C 6810-3180pFC149 C249 C 6808-7 470pFC150 C250 C 6806-1 .01µF

Q43059-7 Main Module Parts List (D 7993-5 Board)

C151 C251 C 6806-1 .01µFC152 C252 C 6950-7 82pF 5%C153 C253 C8897-8 .1µFC154 C254 C 8426-6 .1µF 250VC155 C255 C 8897-8 .1µFC156C256 C 8897-8 .1µFC157 C257 C 6806-1 .01µF

DIODESD1 C 2851-1 1N4004D2 C 2851-1 1N4004D3 C 2851-1 1N4004D4 C2851-1 1N4004D5 C 2851-1 1N4004D6 C 2851-1 1N4004D7 C 2851-11N4004D108 D208 C 3181-2 1N4148D109 D209 C 3181-2 1N4148D110 D210 C3181-2 1N4148D111 D211 C 5061-4 1N3070D112 D212 C 3181-2 1N4148D113D213 C 3181-2 1N4148D120 D220 C 3181-2 1N4148D121 D221 C 3181-21N4148D122 D222 C 3181-2 1N4148D123 D223 C 5061-4 1N3070D124 D224 C3181-2 1N4148D125 D225 C 3181-2 1N4148D126 D226 C 5061-4 1N3070D127D227 C 5061-4 1N3070D129 D229 C 3181-2 1N4148D130 D230 C 3181-21N4148D131 D231 C 3181-2 1N4148D132 D232 C 3181-2 1N4148

TRANSISTORSQ100 Q200 D 2961-7 NPN 2N3859AQ101 Q201 C 3578-9 PNPMPSA93Q102 Q202 C 3810-6 NPN MPSA43Q103 Q203 C 3786-8 PNPPN4250Q105 Q205 C 3578-9 PNP MPSA93Q106 Q206 C 3625-8 NPN2N4125Q107 Q207 C 3786-8 PNP PN4250Q108 Q208 D 2961-7 NPN2N3859AQ109 Q209 D 2961-7 NPN 2N3859AQ110 Q210 C 3810-6 NPNMPSA43Q112 Q212 C 3625-8 NPN 2N4125Q113 Q213 C 3625-8 NPN2N4125Q115 Q215 D 2962-5 NPN MPS8097Q116 Q216 C 3786-8 PNPPN4250Q117 Q217 D 2961-7 NPN 2N3859AQ118 Q218 D 2961-7 NPN2N3859A

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Q43059-7 Main Module Parts List (D 7993-5 Board)

Q119 Q219 C 3625-8 NPN 2N4125Q120 Q220 C 3625-8 NPN 2N4125Q121Q221 C 7458-0 NPN 2N4123Q122 Q222 C 7458-0 NPN 2N4123Q123 Q223 C7458-0 NPN 2N4123Q124 Q224 C 3625-8 NPN 2N4125

RESISTORSR1 A10265-53621 53.6K 1%R2 C 7340-0 24 5WR3 C 7340-0 245WR4 A10265-46421 46.4K 1%R5 A10266-3321 3.3KR7 A10266-1041 100KR8A10266-2031 20KR9 A10266-5121 5.1KR16 A10266-5121 5.1KR17A10266-2031 20KR18 A10266-1041 100KR100 R200 C 7409-3 5K LevelPotR101 R201 A10265-49911 4.99K 1%R102 R202 A10266-5111 510R103R203 A10265-10031 100K 1%R104 R204 A10266-2721 2.7KR105 R205A10266-2721 2.7KR106 R206 A10266-1231 12KR107 R207 A10266-683168KR108 R208 A10266-8211 820R109 R209 A10266-6801 68R110 R210A10266-6831 68KR111 R211 A10266-1231 12KR113 R213 A10266-47214.7KR118 R218 C 7780-7 270 Flame ProofR119 R219 A10266-3011 300R120R220 C 7780-7 270 Flame ProofR121 R221 C 5062-2 100K Pot(-ODEP)R122 R222 A10266-2741 270KR123 R223 A10266-1232 12K .5WR124R224 A10266-6821 6.8KR125 R225 C 7782-3 100 Flame ProofR126 R226 C7782-3 100 Flame ProofR127 R227 A10266-6821 6.8KR128 R228A10266-1031 10KR129 R229 A10266-1041 100KR130 R230 A10266-1041100KR131 R231 A10266-1031 10KR132 R232 C 5062-2 100K Pot(+ODEP)R133 R233 A10266-2741 270KR134 R234 A10266-1232 12K .5WR135R235 C 7782-3 100 Flame ProofR136 R236 A10266-6821 6.8KR137 R237 C7782-3 100 Flame Proof

R138 R238 A10266-6821 6.8KR139 R239 A10266-8211 820R140 R240A10266-6801 68R141 R241 A10266-1541 150KR142 R242 A10266-1541150KR143 R243 A10266-1041 100KR144 R244 A10266-1041 100KR145 R245A10266-1851 1.8MR146 R246 A10266-1031 10KR147 R247 C 7781-5 200 .5WFlame PrfR148 R248 A10266-2721 2.7KR149 R249 C 7781-5 200 .5W FlamePrfR150 R250 A10266-2721 2.7KR151 R251 A10266-1031 10KR152 R252A10266-1231 12KR153 R253 JUMPER JUMPERR154 R254 C 8261-7 121K0.1%R155 R255 A10266-1321 1.3KR156 R256 A10266-1321 1.3KR157 R257A10266-1321 1.3KR158 R258 A10266-9121 9.1KR159 R259 A10266-10211KR160 R260 C 8260-9 10K 0.1%R161 R261 A10266-4701 47R162 R262A10266-4701 47R163 R263 C 8261-7 121K 0.1%R164 R264 C 8260-9 10K0.1%R165 R265 C 8261-7 121K 0.1%R166 R266 A10266-1851 1.8MR167 R267A10265-10011 1K 1%R168 R268 A10265-95301 953 1%R170 R270A10265-10011 1K 1%R171 R271 A10265-95301 953 1%R173 R273 C 8260-910K 0.1%R174 R274 A10265-24921 24.9K 1%R175 R275 A10265-11521 11.5K1%R176 R276 A10265-24921 24.9K 1%R177 R277 A10265-40221 40.2K1%R179 R279 A10266-1321 1.3KR180 R280 A10266-4711 470R181 R281A10266-4721 4.7KR182 R282 A10266-2201 22R183 R283 A10266-24212.4KR184 R284 A10266-4741 470KR185 R285 A10266-2421 2.4KR186 R286A10266-2751 2.7MR187 R287 A10266-3631 36KR188 R288 A10266-363136KR189 R289 A10266-2731 27KR190 R290 A10266-2051 2MR191 R291A10266-3331 33KR192 R292 A10266-1031 10K

Power Base-2 & 800CSL Amplifier Service Manual

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Q43059-7 Main Module Parts List (D 7993-5 Board)

R193 R293 A10266-1031 10KR194 R294 A10266-1041 100KR195 R295A10266-3021 3KR196 R296 A10266-4721 4.7KR197 R297 A10266-103110KR198 R298 A10266-4721 4.7KR199 R299 A10266-1031 10KR909 R1009A10266-4741 470KR910 R1010 A10266-4741 470KR911 R1011 A10266-15211.5KR912 R1012 A10266-4711 470R913 R1013 A10266-1051 1MR915 R1015A10266-1001 10R916 R1016 A10266-1001 10R917 R1017 A10266-1002110KR918 R1018 A10266-10021 10KR919 R1019 A10266-10021 10KR920 R1020A10266-10021 10KR921 R1021 C 9079-2 200 Pot (CMR Null)

SWITCHESS2 C 7325-1 Ground LiftS3 C 7960-5 SensitivityS4 C6781-6 Stereo/Mono

IC’SU1 C 5095-2 UA7815U2 C 5096-0 UA7915U100 U200 C 6911-9UPA75U101 U201 C 4345-2 LM339U102 U202 C 4345-2 LM339U103 U203 C6910-1 UPA76U104 U204 C 7558-7 MC33079P

MISC.Board D 7993-5Socket C 3450-1 14 PinNut A10102-5 Hex6-32Heatsink C 5341-0 TO-220Torq. Spreader C 6541-4Washer C 8973-7#6, SplitScrew C 9067-7 StainlessJ1 C 7593-4 5 Pin HeaderJ11 C7526-4 3 Pin HeaderJ12 C 7873-0 2 Pin HeaderJ100 J200 C 6777-4Phone JackCover C 6778-2 Phone Jack CoverJ500 J800 D 6619-7 10 InchRibbonJ600 J700 D 6620-5 6 Inch Ribbon