JBL 6021 Manual

JBL
6021/6022
INSTALLATION
ANDSERVICE
MANUAL

OwnersInstructions ProductSpecifications
ArchitecturalSpecifications
Theamplifiershallbesinglechannelwithaninputgain
controlandanoutputlevelmeteronthefrontpanel.
Theamplifiershallaccommodateanunbalancedhigh
impedanceinput,ora balancedlowimpedanceinput
withanoptionalplug-inaccessorytransformer.
Theamplifiershallbecapableofdeliveringa min-
imumof200W,continuoussinewave,20Hz-20kHz,
intoa 4 O load. (6021: Theamplifiershallincorporate
anoutputtransformerallowingfullpoweroperation,
35Hz-20kHz,intoan8 0,16O or70.7V lineaswell
asa directoutputterminalfora 4 O load.][6022:No
outputtransformerandonlya directoutputterminal
shallbeprovided,butitshallbepossibletoinstallan
outputtransformereasilyatanytime.)
Theamplifiershallhave< 0.2%THD,20Hz-20kHz,
@200W,directoutput. (6021: Theamplifiershallhave
<0.2%THD,35Hz-20kHz, @ 200W,transformer
output.)Frequencyresponseshallbe± 0.5dB,
20Hz-20kHz,@ 1W.Powerbandwidthshallbe
10hz-40kHz.
Constructionoftheamplifiershallbemodular.The
entireamplifiercircuit,exceptforthepowersupply
(6021: andoutputtransformer)shallbemountedon
asinglecircuitboardattachedtotheheatsink,which
assemblyshallberemovablefromtheunitwiththe
mainframestillmountedina rack.Cablesconnecting
thecircuitboardtothemainframeshallbeofa length
sufficienttoallowremovaloftheboardwithoutdis-
connectionandshalldisconnecteasilyattwoplugs.
TheamplifiershalloccupyfourstandardEIArack
spacesandshalloperateon120/240VAC,50/60Hz.
LOCUT/OUT
SWITCH(S301)
TRANSFORMEROUTPUT
TERMINALSTRIP(TB302)
LINETERMINAL
STRIP(TB301)
Model 6022 6021
PowerOutput1
Direct
Transformer 200W
Optional 200W
200W
PowerBandwidth
Direct-Full
-%
20Hz-
10Hz-20kHz,: 40kHz,:
t0.5dB
t0.5dB
Transformer—Full 35Hz-20kHz,±1 dB
THD2
Direct
Transformer <0.2%
IM3
Full
10W,0.15W <0.2%
<0.1%
LoadImpedance
Direct
Transformer(taps) 4n 40 8Q
160
25n
OutputRegulation
Direct
Transformer Betterthan15%
PowerGain 72dB
InputSensitivity
Unbalanced
(50kO) 0.78V
Balanced4
0.38V
Balanced5
6 0.08V
Signal-to-Noise
Ratio7 100dB
Low-CutFilter 6dB/octavebelow250Hz,switchable
PowerRequirements 120/240VAC,50/60Hz
PowerConsumption
Quiescent 40W
y3Power 275W
FullPower 440W
Fuse 5A,3AG(120V)2.5A,3 AB(240V)
MaximumAmbient
Temp. 60°C(140°F)
MountingEIASTD
Spaces 4
Dimensions
FrontPanel 483x178mm(19x7in)
DepthofControls 19mm{%in)
DepthBehindPanel 325mm(1225/32in)
NetWeight 16kg(35lb)22kg(47lb)
ShippingWeight 20kg(44lb)26kg(57.3lb)
Accessories JBL5195
Matching/BridgingTransformer
JBL60-6022
OutputTransformerAssembly
OPTIONALMATCHING/BRIDGING
TRANSFORMERINPUTSOCKET(XK301)
FIGURE1
NOTES: 1.Continuoussinewave.
2. Totalharmonicdistortionatratedoutput.
3.SMPTEstandard.
4. 600CI or15kOwith5195Matching/Bridging
Transformer.
5.600CI,14 dBstep-upconfiguration.
6.Requiresinternalmodification.
7.Requires20kHzequivalentbandwidthfilter.
DIRECTOUTPUT
TERMINALSTRIP(TB303)
RCA-TYPE
INPUTS(J301)

Installation
The6021/6022issuitableeitherforrackmountingin
fourEIArackspaceswithoutadditionalbracingor
ventilation,orforcounter-topplacement.A fullsetof
mountinghardwareispackedwitheachunit.Allexter-
nalconnectionsandmatching/bridgingtransformer
optionaremadeontherearpanel,Figure1.
OperatingTemperature
Becausethe6021/6022iscooledbyconvection,
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.Directcouplingisaccomplishedby con-
nectingthecenterconductorofa shieldedcableto
LOandtheshieldleadtoGND,ortoeitherRCA-type
phonojack,Table2 liststheterminalsandtheRCA-
typephonojacksandapplicationsoftheLINEterminal
strip. Fortransformer-isolatedinput,(Figure2)must
bepluggedintothe9-pinreceptacle, XK301, Figure1.
TheinputleadsareconnectedtoterminalsHI,LOand
GNDoftheLINEterminalstrip.
OutputConnections
Table3 showstheoutputconfigurationsavailable.
TABLE1
GainControlsinputofamplifier.Controliswired
aheadoftheactivecircuitryandcanbeusedas
aninputpadtopreventoverloadingandclipping
ofthenon-invertingoperationalamplifierstage.
NOTE: WhentheJBL5195matching/bridging
transformerisused,thegaincontrolisacross
theoutputofthetransformerandtherefore can-
notbeusedtopreventinputtransformersatur-
ationifexcessinputlevelsoccur.
PowerSwitchAppliesprimarypowertoamplifier.
MeterProvidesapproximationoftheoutputlevel,
with+3indicatingthattheamplifierisdeliver-
ingitsratedcontinuoussinewavepowerinto
4a.
Lowcut/outOfferstheusera responseroll-offof6 dBper
octavebelow250Hz.
FIGURE2
TABLE2/TABLE3
Terminals
(TB301) Terminals
(TB302) Impedance DirectOut TransformerOut Link
LO, ChassisGND 4O (28.3V) Yes None
8O com 80(40V) Yes "HI"to"XFMRPrimary"
16Ocom 160(56.57V) Yes "HLto"XFMRPrimary"
70.7V com 25O Yes "HI"to"XFMRPrimary"
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,y2W,connected
toterminals"HI"and"LO"
Balanced600Cl sourcewith
uptolevelof4 dBmwith
14dBadditionalgain.
-none-
Internalmodification
requiringservice
technician.

ServiceandMaintenanceInstructions
Thefollowingproceduresaredesignedtoassistinthe
isolationofmalfunctions.Theoperationsdescribed
shouldbeundertakenonlyafteraninvestigationofall
externalconnectionsandadjustmentshasindicated,
beyondreasonabledoubt,thattheproblemisactually
withintheamplifier.
WARNING:Disconnecttheamplifierfromthepower
sourcebeforeperformingserviceoperationsor
replacingcomponents.
VoltageConversion
Eitheramplifiercanbeoperatedfromeithera 120VAC
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
to240VACadapter(notprovided).Theadapter
aswellasthepowersupplycordand/orattachment
plugusedforthe240VACmodeintheU.S.,
CanadaandJapanshallbebothULListedand
CSACertifiedforusewithsaidpowersource
receptacleandwiredperTable4.Foruseinother
countries,adapter,linecordand/orattachment
plugselectionshallbebasedonlocalregulations
governing240VAC,50/60Hzsupplysources.
4. Changethelinefusefroma 5A,3AGtypetoa
2.5A,3AB.
FIGURE3
TB401-
WARNING
THISSECTIONOFTHEMANUAL
CONTAINSSERVICEINSTRUCTIONS
FORUSEBYQUALIFIEDSERVICE
PERSONNELONLY.
FIGURE4A
120VAC
FIGURE4B 240V AC
TABLE4 LineCordConnections
TerminalStrip FuseHolder GroundLug
Country WireColorCode (TB401) (CenterTerminal) (Figure3)
U.S.,CanadaandJapan Black — Attached -
White Attached — —
Green - - Attached
Europe Blue — Attached -
Brown Attached — —
Green/Yellow --Attached
120 240 120
120 240 120

WARNING
THISSECTIONOFTHEMANUAL
CONTAINSSERVICEINSTRUCTIONS
FORUSEBYQUALIFIEDSERVICE
PERSONNELONLY
Stem JBLPartNo. Qty. Description
1 52886 1 knob
2 55021 1 panel
3 55098 1 meter
4 51580 7 10-32Keps3
5 10997 10
4-40xy4 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 55037 1 poweramplifierboard
17 55153 4 6-32x V2hexwasherheadscrew
*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 a 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, 200 W, isthe same
as 20 kHz at 1 W andthatthestableidlepower is
30-40W. If not, the followingprocedure is required:
1. Substituteresistor R37 with a decade box.
2. Adjusttheamplifier for 1 W at20kHz.
3.Adjustthedecade for minimumdistortion and sub-
stitute R37 with the closest EIA standardresistor.
4. Verifydistortion at200W and1 W.
NOTE: Amplifiermust be warmbeforeperforming
distortionmeasurements or adjustments.
DCOffsetAdjustment
Connectthemultimeter 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 6022}
Toinstall the optionaloutputtransformer,Figure 5,
(ModelNo.60-6022):
1. Remove the heatsink/circuitboardassembly.
2. Place the optionaloutputtransformer inthe corner
ofthechassisandsecure itat thefourholes inthe
bottom ofthe chassiswith the hardwareprovided.
3.Attach the Molexconnector to thematingconnector
of the amplifier.
4. Remove the coveroverthecutout forthe TRANS-
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

Performanceplot of a typicalunit WARNING
THISSECTION OFTHE MANUAL
CONTAINSSERVICEINSTRUCTIONS
FOR USEBY QUALIFIEDSERVICE
PERSONNELONLY.
NOTES.
Graphsrecordedu3^gRadiomatersBKFta,-aECdlS2aadSMU401
Frequency respunse an^drslOTtionTTwa^urernents!"made using a
"constant"inputlevet tofne amplifier"undefTest
NOTES
GraphsrecordedusingRadiometersBKF10REC61S2andSMU401
Frequencyresponse and distortionmeasurementsmadeusing a
constantinputlevel tothe amplifierundertest

JBL
Professional Division
JamesB.LansingSound,Inc..8500BalboaBoulevard,Northridge,California91329 U.S.A.
58C34 PTVI6021,22 10/78 Printed in U.S.A.