JBL 6007 Manual

JBL
6007/6008
INSTALLATION
ANDSERVICE
MANUAL

OwnersInstructions ProductSpecifications
ArchitecturalSpecifications
Theamplifiershallbesinglechannelwithaninputgain
controlandanoutputlevelmeteronthefrontpanel.
Theamplifiershallaccommodateanunbalancedhigh
impedanceinput,ora balancedlowimpedanceinput
withanoptionalplug-inaccessorytransformer.
Theamplifiershallbecapableofdeliveringa min-
imumof60W,continuoussinewave,20Hz-20kHz,
intoa 4 Q load. [6007:Theamplifiershallincorporate
anoutputtransformerallowingfullpoweroperation,
35Hz-20kHz,intoan8 0,16Q or70.7V lineaswell
asa directoutputterminalfora 4 O load.}[6008:No
outputtransformerandonlya directoutputterminal
shallbeprovided,butitshallbepossibletoinstallan
outputtransformereasilyatanytime.}
Theamplifiershallhave< 0.2%THD,20Hz-20kHz,
@60W,directoutput.[6007:Theamplifiershallhave
<0.2%THD,35Hz-20kHz, @ 60W,transformer
output.}Frequencyresponseshallbe± 0.5dB,
20Hz-20kHz,@ 1W.Powerbandwidthshallbe
10Hz-40kHz.
Constructionoftheamplifiershallbemodular.The
entireamplifiercircuit,exceptforthepowersupply
[6007: andoutputtransformer}shallbemountedon
asinglecircuitboardattachedtotheheatsink,which
assemblyshallberemovablefromtheunitwiththe
mainframestillmountedina rack.Cablesconnecting
thecircuitboardtothemainframeshallbeofa length
sufficienttoallowremovaloftheboardwithoutdis-
connectionandshalldisconnecteasilyattwoplugs.
TheamplifiershalloccupythreestandardEIArack
spacesandshalloperateon120/240VAC,50/60Hz.
LOCUT/OUT
SWITCH(S301)
TRANSFORMEROUTPUT
TERMINALSTRIP(TB302)
LINETERMINAL
STRIP(TB301J
Model 6008 6007
PowerOutput1
Direct 60W 60W
Transformer Optional 60W
PowerBandwidth
Direct-Full 20Hz-20kHz,± 0.5dB
-% 10Hz-40kHz,± 0.5dB
Transformer—Full 35Hz-20kHz,± 1 dB
THD2
Direct -n oo/
Transformer
IM3
Full, 10W,0.15W <0.2%
LoadImpedance
Direct 4n 4a
Transformer[taps) 80
16O
83n
OutputRegulation
Direct
Transformer Betterthan15%
PowerGain 72dB
InputSensitivity
Unbalanced
(50kO) 0.4V
Balanced4
0.27V
Balanced5-6
0.07V
Signal-to-Noise
Ratio7 90dB
Low-CutFilter 6dB/octavebelow250Hz,switchable
PowerRequirements 120/240VAC,50/60Hz
PowerConsumption
Quiescent 20W
y3Power 105W
FullPower 165W
Fuse 2A,3AG(120V)1 A,3AB(240V)
MaximumAmbient
Temp. 60°C[140°F)
MountingEIASTD
Spaces 3
Dimensions
FrontPanel 483x133mm(19x5%2in]
DepthofControls 19mm{%in)
DepthBehindPanel 325mm
(122%2 in)
NetWeight 10.3kg (223/4 lb)12.7kg(28.0lb)
ShippingWeight 13.5kg(29%lb)15.8kg(34%lb)
Accessories JBL5195
Matching/BridgingTransformer
JBL60-6008
OutputTransformerAssembly
NOTES: 1.Continuoussinewave.
2. Totalharmonicdistortionatratedoutput.
3.SMPTEstandard.
4. 600Oor15kOwith5195Matching/Bridging
Transformer.
5.600Q,14dBstep-upconfiguration.
6.Requiresinternalmodification.
7.Requires20kHzequivalentbandwidthfilter.
OPTIONALMATCHING/BRIDGING
TRANSFORMERINPUTSOCKET(XK301)
FIGURE1
DIRECTOUTPUT
TERMINALSTRIP(TB303)
RCA-TYPE
INPUTSCJ301)

Installation
The6007/6008issuitableeitherforrackmountingin
threeEIArackspaceswithoutadditionalbracingor
ventilation,orforcounter-topplacement.A fullsetof
mountinghardwareispackedwitheachunit.Allexter-
nalconnectionsandmatching/bridgingtransformer
optionaremadeontherearpanel,Figure1.
OperatingTemperature
Becausethe6007/6008iscooledbyconvection,
adequateclearanceonthetopoftheunitmustbe
providedtoallowheatdissipation.Theminimum
recommendedclearancewhenstackingtheunitis
oneEIAstandardpanelspace.
Athermalswitchintheseunitsprovidesthermal
protectionbyshuttingdowntheamplifieriftheinternal
temperatureexceedsa safeoperatinglevel.Themax-
imumallowableambienttemperaturefortheamplifier
is60°C(140°F).
OperatingControls
Alloperatingswitches,meterandlevelcontrolare
locatedoneitherthefrontpanelortherearpanel,
Figure1.Control,meterandswitchfunctionsaregiven
inTable1.
InputConnections
Inputconnectionstotheamplifiermaybeeitherdirect-
coupledortransformer-isolatedattheLINEterminal
strip, TB301, ortheRCA-typephonojacks,J301,
Figure1.Direct-couplingisaccomplishedby con-
nectingthecenterconductorofa shieldedcableto
LOandtheshieldleadtoGND,ortoeitherRCA-type
phonojack.Table2 liststheterminalsandtheRCA-
typephonojacksandapplicationsoftheLINEterminal
strip. Fortransformer-isolatedinput,a 5195matching/
bridgingtransformer[Figure2}mustbepluggedinto
the9-pinreceptacle, XK301, Figure I.The inputleads
areconnectedtoterminalsHI,LOandGNDofthe
LINEterminalstrip.
OutputConnections
Table3 showstheoutputconfigurationsavailable.
TABLE1
GainControlsinputofamplifier.Controliswired
aheadoftheactivecircuitryandcanbeusedas
aninputpadtopreventoverloadingandclipping
ofthenon-invertingoperationalamplifierstage.
NOTE: WhentheJBL5195matching/bridging
transformerisused,thegaincontrolisacross
theoutputofthetransformerandtherefore can-
notbeusedtopreventinputtransformersatur-
ationifexcessinputlevelsoccur.
PowerSwitchAppliesprimarypowertoamplifier.
MeterProvidesapproximationoftheoutputlevel,
with+3indicatingthattheamplifierisdeliver-
ingitsratedcontinuoussinewavepowerinto
4o.
Lowcut/outOfferstheusera responseroll-offof6 dBper
octavebelow250Hz.
FIGURE2
Terminals RCA-Type PhonoJacks Function Application TerminatingResistor SpecialInstructions
50kO
GND DirectCoupled Forunbalancedhighimpedance
(50kO)sources
— none—
"A"or"B"
-none—
HI
LO
GND
Transformerisolated Balancedhighimpedance
(15kO)sourceuptolevelof
+15dBm(with5195matching/
bridgingtransformer)
— none—
Balanced600O sourceupto
levelof+15dBm(with5195
transformer)
620O,V2W,connected
toterminals"HI"and"LO'
Balanced600O sourcewith
uptolevelof4 dBmwith
14dBadditionalgain.
— none-Internalmodification
requiringservice
technician.
Terminals
(TB301) Terminals (TB302) Impedance DirectOut TransformerOut Link
LO, ChassisGND 40(20V) Yes None
8O.C0M 8 0(28.28V) Yes "HI"to"XFMRPrimary"
16a,COM 160(40V) Yes "HI"to"XFMRPrimary"
70.7V COM 50O Yes "HI"to"XFMRPrimary"'
TABLE2/TABLE3

ServiceandMaintenanceinstructions
Thefollowingproceduresaredesignedtoassistinthe
isolationofmalfunctions.Theoperationsdescribed
shouldbeundertakenonlyafteraninvestigationofall
externalconnectionsandadjustmentshasindicated,
beyondreasonabledoubt,thattheproblemisactually
withintheamplifier.
WARNING:Disconnecttheamplifierfromthepower
sourcebeforeperformingserviceoperationsor
replacingcomponents.
VoltageConversion
Eitheramplifiercanbeoperatedfromeithera 120V AC
or240V AC,50/60Hzsource.Thelinevoltageselector
terminalstrip, TB401, Figure3,changestheprimary
connectionsofthepowertransformer.Usethefollow-
ingproceduretochangethevoltagerange:
1. Removethe10screwswhichholdthetopcover
tothechassis.
2. Toconvertfrom120VACto240VAC,removethe
twoterminalstripjumpers,Figure4a.Installone
jumperonlyperFigure4b.
3.Changethelinecordand/orattachmentplugto
matchthesupplysourcereceptacle,orusea 120V
to240V ACadapter[notprovided).Theadapter
aswellasthepowersupplycordand/orattachment
plugusedforthe240VACmodeintheU.S.,
CanadaandJapanshallbebothULListedand
CSACertifiedforusewithsaidpowersource
receptacleandwiredperTable4.Foruseinother
countries,adapter,linecordand/orattachment
plugselectionshallbebasedonlocalregulations
governing240VAC,50/60Hzsupplysources.
4. Changethelinefusefroma 2A,3AGtypetoa
1A,3AB.
WARNING
THISSECTIONOFTHEMANUAL
CONTAINSSERVICEINSTRUCTIONS
FORUSEBYQUALIFIEDSERVICE
PERSONNELONLY.
FIGURE4A
120VAC
FIGURE4B 240V AC
FIGURE3
TB401
TABLE4
LineCordConnections
Country WireColorCode TerminalStrip (TB401) FuseHolder
(CenterTerminal) GroundLug
(Figure3)
U.S.,CanadaandJapan Black
White
Green Attached Attached
Attached
Europe Blue
Brown
Green/Yellow Attached Attached
Attached
120 240 120
120 240 120

WARNING
THISSECTIONOFTHEMANUAL
CONTAINSSERVICEINSTRUCTIONS
FORUSEBYQUALIFIEDSERVICE
PERSONNELONLY.
Item JBLPartNo. Qty. Description
1 52886 1 knob
2 55651 1 panel
3 55098 1 meter
4 51580 7 10-32Keps3
5 10997 10
4-40x% Phillips-headmachinescrew
6 54959 1 lamp
7 54969 1 knob
8 4 3mm1
9 4 3mm1
10 4 3mm1
11 1
2
12 89508 1 10-32Keps2
13 11908 1
No. 6 inter-toothwasher
14 54968 1 6-32hexspacer
15 55523 1 switch
16 55039 1 poweramplifierboard
17 55153 4 6-32x y2hexwasherheadscrew
*NOTES: 1.NoJBLreplacementforthe3 mmset.
2. Unitmayhaveeithera Kepsnut,KepsnutandwasherorKepsnut,splitwasherandflatwasher.
3.KepsnutlockedtopanelstudwithLoctite.

WARNING
THISSECTION OF THEMANUAL
CONTAINSSERVICEINSTRUCTIONS
FOR USEBY QUALIFIEDSERVICE
PERSONNELONLY.
InstrumentType RequiredCharacteristic RecommendedInstrument
TestOscillator FrequencyRange:
20 Hz- 20kHz
Distortion: <0.001%
Output:1 V RMS Min.
SoundTechnology
Model1700 A
DistortionAnalyzer Measurable
to 0.002% SoundTechnology
Model1700 A
Multimeter Accuracy:0.1%reading
+ 1 digit
DCRange: ± 199.9 mVto± 1199 V
Resistance:±0.2% of reading + 1 digit
InputImpedance: 10MO
FlukeModel8000A
OutputLoadResistors 100W,
4 Hand 8 O Non-inductiveType,1% DaleNH-100
ResistorDecade Box
10-1kOMin.
VariableAutotransformer Capable
of supplyingMin. of500W over a range of 90-136 V.
1. If autotransformerdoes not have anAC voltmeter to indicate
outputvoltage,monitor the outputwitheither a multimeter orAC
voltmeter.
2. If autotransformerdoes not have a wattmeter, a wattmeter
capable of indicating15 - 270 W will be required.
GenRadW5MT3W
RecommendedTestEquipment
Thefollowingtestprocedures are requiredafter anIC,
drivertransistor,biasnetworkdiode,thermistor, or
outputdevice is replaced:
BiasAdjustment
Verifythatthedistortion at20 kHz, 60 W, isthe same
as 20kHzat 1 W andthat the stableidlepower is
15-20W. If not, the followingprocedure is required:
1. Substituteresistor R37 with a decade box.
2. Adjusttheamplifier for 1 W at20kHz.
3.Adjust the decade for minimumdistortion and sub-
stitute R37 with the closest EIA standardresistor.
4. Verifydistortion at60W and1 W.
NOTE: Amplifiermust be warmbeforeperforming
distortionmeasurements or adjustments.
DCOffsetAdjustment
Connect the multimeter to testpoint #2onthe circuit
board. With the meter setatthe lowest DC voltage
range(mV),adjustthe DC NULLcontrol,R10, fora
minimum DC voltage, 0 ± 25mV.
NOTE: Amplifiermust be warmbeforemaking
adjustments.
Installation of OptionalOutputTransformer
(option on 6008)
Toinstall the optionaloutputtransformer,Figure 5,
ModelNo.60-6008:
1. Remove the heatsink/circuitboardassembly.
2. Place the optionaloutputtransformer inthe corner
ofthechassisandsecure itat thefourholes inthe
bottom of thechassiswith the hardwareprovided.
3.Attach the Molexconnector to thematingconnector
oftheamplifier.
4. Remove the coveroverthecutout for theTRANS-
FORMEROUTPUTterminalstrip.Slip thenew
terminalstrip of theoutputtransformerthrough the
cutoutandorient itso thattheGRAYwire isthe
COM. Screw the terminalstrip in placewith the
screwsthatheld the cover.
NOTE: If theoutputtransformer istobe used,install
aLINKbetween LOandHIof theDIRECTOUTPUT
terminalstrip,Figure 1.
14dBAdditionalGainConversion
14 dBof additionalinputsensitivity,using the optional
JBLModel5195matching/bridgingtransformer, can
beoffered tothe user by removing the REDwire con-
nected topin#8ofthe 9-pinreceptacle, XK301, and
reconnecting ittopin#7.
20 kHz Equivalent
BandwidthFilter
INPUT
OUTPUT

Performanceplotofa typicalunit
WARNING
THISSECTIONOFTHEMANUAL
CONTAINSSERVICEINSTRUCTIONS
FORUSEBYQUALIFIEDSERVICE
PERSONNELONLY.
NOTES.
GraphsrecordedusingRadiometersBKF10REC61S2andSMU401
Frequencyresponseanddistortionmeasurementsmadeusinga
Gc5nsJaht"inpuTlevertotheamplifierundertest

JBL ProfessionalDivision
JamesB.LansingSound,Inc.,8500BalboaBoulevard,Northridge,California91329 U.S.A.
58028PTM6007/810/78Printedin U.S.A.