JBL 7130 Manual

JBL 7130
INSTALLATION
AND SERVICE
MANUAL

Owners Instructions
Architectural Specifications
The 7130compressor/Iimiter shall haveanoutputcapacityof
+18dBmfrom20Hz-20kHz,±1dBandtotalharmonicdistor-
tion shall be less than0.25%to+18dBm,20Hz-20kHzineither
thecompressionorlimitingmodewithupto30dBofgain
reduction.
The unit shall accepthighimpedance,unbalancedmicrophones.
The microphonepreamplifiercircuitry shall employfieldeffect
transistors forlow noise. The compressor shall becapableofany
combinationofline-line,mic-mic,orline-micoperation. Bal-
anced inputs shall bepossiblebyusingoptionalinputtrans-
formers. Outputs shall betransformerisolatedordirectfor
connection toa balancedorunbalanced600ft line.
The compressor/limiter shall beequippedwitha selectorswitch
toplacetheunitinoneofthreemodesofoperation:OUT,
COMPRESS, orLIMIT.Thenormalthresholdofcompression
shall be0 dBmoutput.Aninputlevelcontrol shall varythegain
whentheselectorswitchisintheOUTmode.It shall also deter-
minetherelativethresholdwhentheunitisinthe COMPRESS
or LIMITmode.Two switches shall beprovidedfortheselection
ofthreereleasetimesandthreeattacktimes.
The unit shall beequippedwitha meter,governedbya function
selector switch, whichindicatesamountof compression oroutput
level indB.Whenindicatingoutputlevel,threeranges shall be
selectable sothat0 VUonthemeter corresponds toanoutput
level of0 dBm,+4dBm,or+8dBm,unbalanced,and+2dBm,
+6dBm,or+10dBmbalancedoutput.Theunit shall operate
on120/240V AC,50/60Hz.
The unit shall beJBLModel7130.
JBL continuallyengagesinresearchrelatedtoproductimprovement.
Newmaterials,productionmethodsanddesignrefinementsareIntro-
duced intoexistingproductswithoutnoticeastoroutineexpression
ofthephilosophy.Forthis reason, anycurrentJBLproductmaydiffer
insome respects fromitspublisheddescription,butwillalwaysequalor
exceed theoriginaldesignspecifications unless otherwisestated.
PRODUCT SPECIFICATIONS
MaximumGain
DirectInput(Unbalanced)1
Line 30dB,high2
Microphone62dB,highZ
Balanced Input1
Line with519584dB,lowZ
Transformer
Microphonewith30dB,highZ
5901Transformer
Output Characteristics
OutputImpedance
Direct40-80ft, unbalanced
(20Hz-20kHz)
Balanced 400-600ft
(20-20kHz)
MaximumOutputLevel+18dBm
Input Characteristics
InputImpedance
DirectInput(Unbalanced)
Line 15kft
Microphone51kft
Balanced Input
Line with519515kft
Transformer
Microphonewith5901800ft
Transformer
NormalInputLevel
DirectInput(Unbalanced)1
Line 170mVRMSminimum
(-13.5 dBm)
Microphone
InputPad0 5.4mVRMSminimum
(-41.5 dBm)'
InputPad-1530mVRMSminimum
(-28.1 dBm)
InputPad-30163mVRMSminimum
(-13.1 dBm)
Balanced Input1
Line with5195190mVRMSminimum
Transformer (—12.5 dBm)
Microphone1
InputPad0 0.38mVRMSminimum
(-66.2 dBm)
InputPad-152.15mVRMSminimum
(-51.2 dBm)
InputPad-3011.8mVRMSminimum
(-36.2 dBm)
2
InputOverload
DirectInput(Unbalanced)
Line 11.5V RMS (+23.5 dBm)
Microphone
InputPad0 120mVRMS (-16.2 dBm)
InputPad-15650mVRMS(-1.2dBm)
InputPad-303.65V RMS (+13.5 dBm)
Balanced Input
Line with51953.32V (+13.5 dBm)
Transformer
Microphone
InputPad0 9.2mVRMS (-39.5 dBm)
InputPad-1553mVRMS (-24.5 dBm)
InputPad-30270mVRMS(-9.5dBm)
Frequency Response
DirectOutput1
DirectInput
Line +0,-1dB,10Hz-50kHz
Microphone+0.25,-1dB,10Hz-47kHz
Balanced Input1
Line with5195+1,-2dB,30Hz-20kHz
Transformer
Microphonewith5901+1,-2dB,30Hz-20kHz
Transformer
Balanced Output
DirectInput1
Line +0,-1dB,10Hz-30kHz
Microphone+0,-1dB,10Hz-28kHz
Balanced Input1
Line with5195+1,-2dB,10Hz-20kHz
Transformer
Microphonewith5901+1,-2dB,30Hz-20kHz
Transformer
TotalHarmonicDistortion30.2%,20Hz-20kHz
@ ratedoutput
1 4
IntermodulationDistortion»
(SMPTE)
DirectOut
DirectInput(unbalanced)
Line 0.005%
Microphone0.03%
Balanced Input
Line 0.007%
Microphone0.06%
Balanced Output
DirectInput(unbalanced)
Line 0.0065%
Microphone0.06%
Balanced Input
Line 0.0085%
Microphone0.06%
3 5
Equivalent InputNoise'
DirectInput1
Line -100dBm
Microphone—126dBm
1

Balanced Input1
Line with 5195-99dBm
Transformer
Microphone with 5901133.5dBm
Transformer
Compress/Limiter Functions
AttackTime
Fast 400 MS
Medium 3.0ms
Slow 140ms
Release Time
Fast 30dB/s
Medium 8 dB/s
Slow 4 dB/s
Controls
Input 1 & 2 Audiotaper,rotary
OutputAudiotaper,rotary
ThresholdAudiotaper,rotary
Attack3-positionslideswitch
Fast
Medium
Slow
Function3-positionslideswitch
Out
Compress
Limit
Meter Range3-positionslideswitch
OdB
+4dB
+8dB
Meter Select2-positionslideswitchgain
reduction
Line out
MicrophoneAttenuator3-positionslideswitch
OdB
-15dB
-30dB
Release 3—positionslideswitch
Fast
Medium
Slow
Mic1/Line& Mic2/LinePush-lock/push-release
Indicators
PowerOnGreenLED
Meter Illuminated
PowerRequirements
Line Voltage 120/240 V AC, 50/60 Hz
Wattage 15wattsmaximum
Connectors
Line lnput(2) Screwterminalboard
Microphonelnputs(2)FemaleXL-typesocket,
positivelocking
OutputScrewterminalboard
Accessory Transformer 9-pin femalesocket
Dimensions
FrontPanel483mmx 88mm
19inx 3 15/32in
DepthofControls19mm
3/4in
DepthBehindPanel178mm
7in
Weight
Net4 kg
9lb
Shipping5.4kg
12lb
Mounting 2 EIAstandardrack spaces
PanelFinishSemi-glossbakedenamel,darkgray;
white nomenclature
Accessories
Model 5195matching/briding
transformer
Model 5901microphonetransformer
Installation
The7130issuitableeitherforrackmountingintwoEIArack
spaces without additionalbracingorventilation,orforcounter-
topplacement.A full setofmountinghardwareispackaged with
each unit.Allexternalconnectionsaremadeontherearpanel,
Figure2.
OperatingTemperature
Themaximumallowableambienttemperatureforthe7130
is 60°C(140°F).
OperatingControls
Alloperatingswitches,meter,thresholdandlevelcontrols,
exceptforMIC/LINEinputselectorswitches,arelocatedon
the front panel,Figure1.
Input Connections
Input connectionstothe7130maybeeitherdirectcoupledor
transformerisolatedattheXL-typesocketsorscrewterminal
boards, Figure2.
Directcouplingisaccomplishedbyconnectingeitherthecenter
conductorofa shieldedcabletoDIRECT(line input) andthe
shield toGND,orthecenterconductorofa shieldedcableto
pin#2(XL-typeconnector)andtheshieldtopin#1.
For transformerisolatedinputs,a 5901universalmicrophone
transformer(formicrophoneinputs)ora 5195matching/bridging
transformer(forlineinputs),Figure3 and5,maybe used.
Transformerisolationisaccomplishedbyconnectingtheclear
conductorofa twoconductorshieldedcabletoHI(lineinput),
theblackconductortotheLOandtheshieldtoGND,orthe
clear conductorofa twoconductorshieldedcabletopin#3
(XL-typeconductor),theblacktopin#2andtheshieldto
pin#1.
OutputConnections
Outputconnectionstothe7130maybeeitherdirectcoupledor
transformerisolatedatthescrewterminalboard,Figure2.
Directcouplingisaccomplishedbyconnectingthecenter con-
ductorofa shieldedcabletoDIRECTandtheshieldtoGND.
Transformerisolated output isaccomplishedbyconnectingthe
clear conductorofa twoconductorshieldedcabletotheHI,
theblackconductortotheLOandtheshieldtoGND.
InstallationofMicrophoneorLineTransformer
Toinstalltheoptionaltransformers.Figure3 or5, (Model 5195
or5901):
1. Removethetwocopperjumpersbetweenterminals8 & 9
and4 & 5.
NOTE: Removeonlythejumpers from the 9-pin socket
inwhichtheoptionaltransformeristobe used.
2. InstalltheoptionaltransformerperFigure4.
NOTES: 1.600n source.
2. Measuredat0.5%THD.
3.ATTACKand RELEASE timessettoslow.
4. At+18 dBm.
5.Requiresa 20 Hz—20 kHzequivalentbandwidth filter.
2

SWITCH SELECTS
INPUTOPTION
FIGURE 4
JUMPER INSTALLATION
1. Removetheoptionaltransformer from theappropriate
9-pin socket.
2. Installtwo#12AWGcopperjumpersperFigure6.
JUMPER
(PINS8 & 9)
JUMPER
(PINS4 & 5)
OPTIONAL
INPUTTRANSFORMER
(5195or5901)
SWITCH SELECTS
INPUTOPTION
3
FIGURE 3
JUMPER
(PINS8 & 9)
JUMPER
(PINS4 & 5)
JUMPER
(PINS8 & 9)
JUMPER
(PINS4 & 5)
5195
5901

Input1 Controlseitherlinelevelormicro-
phoneinputleveldependingon
positionofMIC1/LINEpush-lock/
push-release switch.
NOTE: WheneithertheJBL
5901or5195transformeris
used, theINPUT1 control
cannot beusedtoprevent
transformersaturationif
excessive inputsignallevels
occur. See SPECIFICATIONS
(Input Characteristics)for
maximuminput.
OutputProvidessimultaneousattenuation
ofallinputchannelsusinga con-
tinuouslyvariablepotentiometer
marked from 0 to10.
Attack Selects oneofthreefixedattack
Medium times:
Fast Slow past
400MS
Medium 3.0ms
Slow 140ms
Input2 Controlseitherlinelevelormicro-
phoneinputleveldependingon
positionofMIC1/LINEpush-lock/
push-release switch.
NOTE: WheneithertheJBL
5901or5195transformeris
used, theINPUT2 control
cannot beusedtoprevent
transformersaturationif
excessive inputsignallevels
occur. See SPECIFICATIONS
(Input Characteristics) for
maximuminput.
Function Compress Selects anyoneofthreeoptional
OutLimitmodesof7130
Meter Select Selects VUmeterfunction.
Gain Reduction
Line Out
Threshold Adjustablecontrolwhich sets the
levelabovewhichcompressionor
limiting occurs.
Power SwitchAppliespower
Push-Lock/Push-Release to7130.
MICAttenuatorReducesgain15dBor30dBon
Pad Switchescorrespondingmicrophoneinput
0dB-30dBchannelstoallowtheuseofhigh-
-15dBimpedancemicrophoneswithout
introducingdistortion.
NOTE: Themicattenuator
padchangesthefeedbackin
theinputstage;itcannotbe
used topreventinputsatura-
tion if excessive inputsignal
levels occur,butdoesnot
effectpossiblesaturationof
optional5901universalinput
transformer.
VU Meter Displayseitheroutputorgain
reductioninvolumeunits(VU).
Meter isilluminatedwhensecondary
voltageisapplied.
Release Selects oneofthreefixedrelease
Medium times:
Fast SlowFast400us
Medium 3.0ms
Slow 140ms
FIGURE 7
LED PowerOnIndicatespowerapplied'tounit.
IndicatorLight
Meter Range Selects full-scalerangeofmeter.
+4dBCalibratedasfollows:
+8 dB 0 dB
METER METER OUTPUT OUTPUT
RANGE
DISPLAY
REF. n
VOLTAGE
0dBm 0 0dBm
0.775V
+4dBm 0 +4dBm 1.129V
+8dBm 0 +8dBm 1.948V
4

Line/MIC2 - Input- Line/MIC1 9-pin socketrequiringeithertwo
copper jumpersbetweenpins4 & 5
and8 & 9,ora JBL5901universal
microphoneinputtransformeror
5195matching/bridgingtrans-
formerallowingforeithera
balanced orunbalancedinput.
OutputUnbalanced600SI director600n
balanced uptoanoutputlevelof
+18 dBm.
Input1 & Balancedinputimpedanceof 15kft
Input2 uptoa levelof+21dBwithout
optional5195matching/bridging
transformer.
Balanced inputimpedanceof600ft
using a 620ft resistorconnectedto
terminalsHIandLO,uptoa level
of+21dBm with optional5195
transformer.
Unbalanced 15k ft input
impedanceor600ft input
impedanceusinga 620ft
resistor connectedtoterminals
GNOand DIRECT.
MIC1 Push-lock/push-release switch
Line allowinginputtobeusedforeither
microphoneorline.
MIC2 Push-lock/push-release switch
Line allowinginputtobeusedforeither
microphoneorline
MIC2 - Input- MIC1 Balancedinputimpedanceof600O.
using a 620n resistorconnectedto
terminalsHIandLO,uptoa level
of+21dBm with optional5195
transformer.
NOTE: WhentheJBL5901
universal microphoneinput
transformeris used, the
microphonepadandcontrol
cannot beusedtoprevent
transformersaturationif
excessive inputsignallevels
occur. See SPECIFICATIONS
(Input Overload)formaxi-
muminput.
FIGURE 2
5

LIMITER MODE
COMPRESSOR MODE
6
A. Controlsetto
B. Input signal, 0 dBm.
C. Controlsetto
D.Controllevelsetfor-1-10dBmat
A. Controlsetto
B. Controlsetto
C. Input signal, 0 dBm.
D.Controllevelsetfor+10dBmat

Service andMaintenanceInstructions
Thefollowingproceduresaredesignedto assist intheisolation
ofmalfunctions.Theoperationsdescribedshouldbeundertaken
onlyafteraninvestigationofallexternalconnectionsandadjust-
mentshasindicated,beyondreasonabledoubt, that theproblem
is actuallyinternal.
WARNING:Disconnectthe7130 from thepowersource
beforeperformingserviceoperationsorreplacing
components.
VoltageConversion
The7130canbeoperated from either120V ACor240V AC,
50/60 Hz source. Thelinevoltageselector,a Molex commoning
connector, Figure7,changestheprimaryconnectionsofthe
powertransformer.Usethefollowingproceduretochangethe
voltagerange:
MOLEX
COMMONING
CONNECTOR
WARNING
THISSECTIONOFTHEMANUAL
CONTAINS SERVICE INSTRUCTIONS
FOR USEBYQUALIFIED SERVICE
PERSONNEL ONLY.
1. Removethefour screws whichholdthetopcovertothe
chassis.
2. Toconvert from 120V ACto240V AC,removeonlythe
followingwires,showninFigure8 andTable2:
3. Removethefrosted spacers from thecommoningconnec-
tor, spaces 7 and8.
4.Insertthetwocoloredcodedwiresremoved from step2,
Table2 andinsertthemperFigure9,Table3:
WHT
(PowerSW-S1a)
BLK/WHT
(PowerSW-S1a)
BLK/WHT
(PowerXfmr)
SPACER
BRN/WHT
(PowerXfmr)
YEL
(Power SW-S 1b)
SPACER
BLK
(PowerCord)
GRN
(PowerXfmr)
SPACER
WHT
(PowerCord)
.SPACER
BLK
(PowerXfmr)
SPACER
BRN
(PowerXfmr)
SPACER
YEL
(PowerXfmr)
BLK
(Power SW-S 1b)
SPACER
GRN
(Vumeter)
FIGURE 8
FIGURE 7
7

TABLE 2 (120 V ACcommoningwirecode)
Comming
WARNING
THISSECTION OF THE MANUAL
CONTAINS SERVICE INSTRUCTIONS
FOR USE BY QUALIFIED SERVICE
PERSONNEL ONLY.
Connector
Wire
Spacer
Terminal
Color
Wire Origin Required
1
Wht PowerCord
2 Wht PowerSwitch
3
Yes
4 Blk/Wht PowerSwitch
5
Blk
PowerTransformer
>6
Blk/Wht PowerTransformer
<
7
Yes
8
Yes
>9
Brn
PowerTransformer
<
10 Brn/Wht PowerTransformer
11
Yes
12
Yel
PowerSwitch
13
Yel
PowerTransformer
14
Yes
15
Blk
PowerSwitch
16
Blk
PowerCord
17
Yes
18 Grn PowerTransformer
19 Grn Meter/LED
Assy.
20
Yes
NOTE: > 8t<denotes commoningconnector terminal
changes required to changelinevoltage from 120V AC
to 240V AC.SeeTable 3 andmanualinstructions for cor-
rectprocedures.
TABLE 3 (240 V ACcommoningwirecode)
Comming
Connector
Wire
Spacer
Terminal
Color
Wire Origin Required
1
Note 1.
PowerCord
2 Wht PowerSwitch
3
Yes
4 Blk/Wht PowerSwitch
5
Blk PowerTransformer
6
Yes
> 7 Blk/Wht PowerTransformer
<
> 8
Brn
PowerTransformer
<
9
Yes
10 Brn/Wht PowerTransformer
11
Yes
12
Yel PowerTransformer
13
Yel
PowerSwitch'
14 • Yes
15
Blk
PowerSwitch
16
Note 1. PowerCord
17 Yes
18 Grn PowerTransformer
19 Grn Meter/LED
Assy.
20
Yes
WHT
(Power SW-S1a)
BLK/WHT
(Power SW-S1a)
SPACER
BRN
(Power Xfmr)
BRN/WHT
(Power Xfmr)
YEL
(Power Xfmr)
SPACER
NOTE 1.
(Power Cord)
GRN
(Power Xfmr)
SPACER
NOTE 1.
(Power Cord)
SPACER
BLK
(Power Xfmr)
BLK/WHT
(Power Xfmr)
SPACER
SPACER
YEL
(Power SW-S1b)
BLK
(Power SW-S1D)
SPACER
GRN
, (Vumeter)
NOTE 1. Based on localregulations.
FIGURE 9
JMOTES: 1. Based on localregulations.
2. > & <denotescommoningconnector terminal
changes required to changelinevoltage from 240V AC,
to 120V AC.SeeTable 2 andmanualinstructions
forcorrectprocedures.
8

5.Insertthefrosted spacers into spaces 6 and9.
6.Changethelinecordand/orattachmentplugtomatch
thesupplysourcereceptacle,orusea 120V to240V AC
adapter(notprovided).Theadapteraswellasthepower
supply cord/orattachmentplugusedfor240V ACmode
intheU.S.,CanadaandJapanshallbebothULlistedand
CSA certifiedforusewithsaidpowersourcereceptacle
andwiredperTable3.Foruseinothercountries,adapter,
linecordand/orattachmentplugselectionshallbebased
onlocalregulations.
7.Incountriesrequiringlinecordshavingwirecodesdifferent
fromthosenoted inStep#6,thefollowingsuggestions
apply.
A. Removetheexistingpowercordfromthe chassis, andbe
carefulnottodamagetheMolexcrimpterminal.Ifa
newMolexcrimpterminalisnotavailable,follow
steps B throughH.Ifa Molex1457-1isavailable,
followstepsI throughM.
B. Cuttheexistingsinglewireofthepowercordhavingthe
Molexcrimpterminal38mm(1.5in).Stripthecutend
ofthewire5 mm (3/16in)andtin.
C. ObtainanElectrovertsinglestrip, 6E/1 DSorequivalent.
D.Usingtheoriginalpowercordasa wireguide,stripthe
outercoveringfromthenewpowercordandcuteach
wiretotheappropriatelength,perthelocalwiringcode.
E. Strip5 mm (3/16in)fromthelongestwireandtin.
F. InsertthewiresfromstepsB andE intotheElectrovert
terminalstripandtightenasrequired.
G. Soldertheappropriatecoloredgroundwiretosolder
lugEl.
H.InsertthecrimpedMolexterminalsintotheMolex
commoningconnector, spaces #1and#16.Verifythat
theremainingtransformercrimpterminalsand spacers
have beenchangedfor240V ACuse,perTable3.
I.Usingtheexistingpowercableasa wirelengthguide,
strip theoutercoveringofthenewpowercordandcut
each wiretolengthperthelocalwiringcode.
J. Strip3 mm (1/8in)fromthelongestwire.
K.InsertthewireintotheMolexterminalperFigure7,
andcrimp,usinga MolextoolmodelHTR1031Cor
equivalent.
L Soldertheappropriatecoloredgroundwiretosolder
lugEl.
M.InsertthecrimpedMolexterminalsintotheMolex
commoningconnector, spaces #1and#16.Verifythat
theremainingtransformercrimpterminalsand spacers
have beenchangedfor240V ACuse,perTable3.
FIGURE 10
9
WARNING
THIS SECTIONOFTHEMANUAL
CONTAINS SERVICE INSTRUCTIONS
FOR USEBYQUALIFIED SERVICE
PERSONNEL ONLY.
VUMETER
CALIBRATION
CONTROL
GAINREDUCTION
CALIBRATION
CONTROL

VU Meter CalibrationProcedure
1. Removethetopcover.
2. ConnectanAC voltmeter totheOUTPUTscrew terminal
boardDIRECTandGNDand terminate with a 600n
load.
3.Connecta testoscillators's600n output, terminated by
a 600n load,toLINE1 screw terminal boardDIRECT
andGND.
4.Setthe7130controlsasfollows:
Input 1 Max
Output Max
FunctionOut
Meter RangedB
Meter SelectLineout
5.Setthetestoscillatorfrequencyto1 kHzatan amplitude
of-31dBm.
6.Adjustthe meter calibrationcontrol,R52,Figure10,
for0 VUindication,0 dBm.
GainReduction,0 VU Meter Calibration
1. Removethetopcover.
2. Setthe7130controlsasfollows:
Input 1 & 2 Minimum
Threshold Minimum
Output Minimum
Meter SelectGainreduction
3.AdjustR62,Figure10,for0 VU.
Compress/LimitAdjustment
1. Removethetopcover.
2. ConnecttheAC voltmeter totheOUTPUTscrew terminal
board,DIRECTandGNDand terminate with a 600ft load.
3.Connectthetestoscillator's600 output, terminated by
600ft load,toLINE1 screw terminal boardDIRECT
andGND.
4.Setthe7130controlsasfollows:
Input 1 Max
ThresholdMax
Output Max
Attack Fast
Release Fast
FunctionCompress
5.Setthetestoscillatorfrequencyto1 kHzatan amplitude
of+10 dBm.
6.AdjustR3,Figure11,for2.7V AC.
7.ResettheTHRESHOLDcontroltominimum.
8.Adjusttheoscillator output level until the output levelof
the7130is+20dBm. Input leveltothe7130mustmeasure
-7 dBm,+3 dBm.
9.SettheFunctionswitchto LIMIT andtheTHRESHOLD
controltomaximum.
10.Adjusttheoscillatorfor0 dBm output ofthe7130. Input
tothe7130shouldread-6dBm,+3dBm.
11. TurntheTHRESHOLDcontroltominimum. Output of
the7130mustread+16dBm,±2dBm.
R3
GAIN TRIM
ADJUSTMENT
FIGURE 11
10
WARNING
THISSECTIONOFTHE MANUAL
CONTAINS SERVICE INSTRUCTIONS
FOR USEBYQUALIFIED SERVICE
PERSONNEL ONLY.

WARNING
THIS SECTION OFTHE MANUAL
CONTAINS SERVICE INSTRUCTIONS
FOR USE BY QUALIFIED SERVICE
PERSONNEL ONLY.
11
7130ExplodedViewandParts List
FIGURE 13.

WARNING
THISSECTIONOFTHEMANUAL
CONTAINS SERVICE INSTRUCTIONS
FOR USEBYQUALIFIED SERVICE
PERSONNEL ONLY.
Item
JBL PartNo. Qty Description
1
55630
4 Knob
2 4 Partofboard
assy.
3
59295
1
Frontpanel
4_ 59309
1 PC
board assy.
5
59311
1 PC
board assy.
6
59315-01
2 Flatribbon
assy.
7 55098
1
Meter
8
59291
1
Meter bracket
9
89508
2 6-32Kepsnut
10 Note
1 4
Meter mountingset
11
58469
7 Glamourshield
12
54969
1 Knob
13
59827
17 #6speedwasher
14 59933-01
1 PC board assy.
15 47631
2 4-40x
1 /4bindingheadscrew
16 47896
7 6-32x 5/16hexheadscrew
17 59893
1 GreenLEDlens
18 54953
1
Powerswitch
19 13189 2 Capacitor
20
59294 1 Chassis
Item
JBL PartNo. Qty Description
21
89654
6 6x 3/8hexwasherscrew
22 59303
1
Commoningconnector
23 59305
5
Polarizingkey
24 59848
11 6x 3/8Phillips-headscrew
25 59306
1
Powertransformer
26 59299
1
Outputtransformer
27 57806
2
Spacer
28 11496 2 4-40hex-nut
29
12267
2 #4lockwasher
30
57807 2 4-40x 1/4panheadscrew
31
58325-01
4 Jumper
32 -2 5195or5901transformer
33 59313
1 PC
board assy.
34 59293
1 Cover
35 82706
3 Terminalstrip
36
55107 2 Recess shell
37
59330 2 Plug
assy.
38
55106 2 9pinsocket
39
47600 2 XLR-typesocket
Note: 1.3mmset.
12

Block Diagram
13
WARNING
THISSECTIONOFTHEMANUAL
CONTAINS SERVICE INSTRUCTIONS
FOR USEBYQUALIFIED SERVICE
PERSONNEL ONLY.

WARNING
THIS SECTIONOFTHEMANUAL
CONTAINS SERVICE INSTRUCTIONS
FOR USEBYQUALIFIED SERVICE
PERSONNEL ONLY.
1
Test EquipmentRequiredTo Meet ProofofPerformance:
Clarostat 240CDecaderesistancebox
Dana 170Amplifier
Fluke 8000ADVM
GenRad W5MT3W Variabletransformer
GenRad 1523/1523P2Graphiclevelrecorderset
GenRad 1840-AOutputpowermeter
HP350BAttenuatorset
HP339ADistortionmeasurementset
HP400FLACvoltmeter
Krohn-Hite3202Filter2
Philips PM3262Dualtrace scope
Sound Technology1770BIMdistortionmeasurementset
Tektronix7000 series Storage oscilloscope
Notes:1.Equivalenttestequipmentmaybesubstituted.
2. 20kHzequivalentbandwidth filter.
14