Kenwood PR-657 User manual

DCPOWERSUPPLY
INSTRUCTIONMANUAL
PR-657

1. GENERAL
YourPR-657isanallsolidstatevoltage-regulatedDC
powersupply,supplying0 to30V.7 A power.It
providesimprovedtemperaturecharacteristics,lineand
loadregulationsandothercharacteristics.Italsoisso
dependablethata built-inprotectivecircuitcanprotect
itagainstshortcircuitsandoverloads,thusrequiringfew
troubleshooting.Usinga remotecontrolswitchbox
.(option)allowsyoutofreelyselectanyoffouroutput
voltagesfroma distantplace.
2BFEATURES
CONTENTS
1. GENERAL2
2. FEATURES2
3.SPECIFICATIONS3
4. CIRCUITDESCRIPTION4
5.CONTROLSANDWHATTHEYDO......6
5.HOWTOOPERATE.8
7.CAUTIONSFORUSE11
8.PARTSLIST12
9.P.C.BOARD......................18
10. SCHEMATICDIAGR' ' ..............19
a. YourPR-657providesadvancedperformanceand
highreliabilityasitsdifferentialamplifierismadeup
ofSC.
b.TheICdifferentialamplifierprovideshighopenloop
gainandgoodlineandloadregulationsandlittle
ripple.
c.Theoutputvoltageiscontinuouslyvariableandcan
besetatanyof0 to30V.
d. Theoutputcurrentavailableisashighas7 A.
e.A built-inprotectivecircuitagainstoutputshortor
overloadpreventsthetransistorsfromdamage, mini-
mizingoccurrenceoftrouble.
f.Anovercurrentindicatoronthefrontpanellights
whena built-inovercurrentprotectivecircuitisin
action.
Thisishelpfulforyoursafetyoperation.
9- Presetswitchesenableyoutoinstantaneouslysetany
ofthreedefferentoutputvoltageswithoutturning
theoutputvoltagecontrol,
h.A remotecontrolswitchbox(option)allowsfreely
switchinganyoffouroutputvoltagesfroma distant
place.
2

3. SPECIFICATIONS
3
PowerSupply
Voltageregulatingcharacteristics,
Outputvoltage:0 to30V.
Outputcurrent:0 to7A.
Lineregulation(with
240V± 10%change!:Betterthan± 5mV.
Loadregulation:Betterthan10mV.
Rippteandnoise:Lessthan5mVp-p.
Residualvoltage:Within0 to+50mV.
Meters,
Voltmeter:0 to32V(fullscale).
Ammeter:0 to7.5A(fullscale).
Voltmeteraccuracy:Betterthan±3%offullscale.
Ammeteraccuracy:Betterthan±3%offullscale.
Transientresponsetime:Shorterthan450psec(with
loadturnedon).
Temperaturecharacteristics,
Temperaturecoefficient:Lowerthan200ppm/°C(0to
40°C).
Operatingtemperature:0 to50°C.
General
Line,
Inputvoltage:100,120,220,or240VAC
±10%.
Frequencyandpower
consumption:50to60Hz,below430W.
Insulationresistance:Over50betweenlineand
cabinet(with500VDC).
Outputconnectors,
Polarity:Positive(+),negative(—)and
common(COM).
Anyconnectormaybe
grounded.
Dimensions:200(208)Hx208Wx363(401)
Dmm
Valuesin( ) include
protrusion
Netweight:13.6kg.
Accessories,
Powercable:1 piece
Plugforremotecontrol:1 piece.
Replacementfuse:3A,5A,2 piecesrespectively
Instructionmanual:1 copy.

4. CIRCUIT DESCRIPTION
InstudyingtheoperationofeachcircuitinyourPR-657,
pleaserefertoFigure1,the"BlockDiagram",andthe
SchematicDiagramonthebackcover.
LINE
VOLTAGE
SELECTOR
ACLINE
AUX POWER
SOURCE
CURRENTAMP
DIFFERENTIAL
AMP
OVERCURRENT
DET
MAIN POWER
SOURCE
LIGHT
Figure1 BlockDiagram
4

MainPowerSource
TheinputACvoltageisfullwave-rectifiedbyD1(KBPC-
2502bridge),issmoothedbyC1(15,000MF),andisfed
totheCurrentAmplifier.
AuxiliaryPowerSource
Thispowersourcefeeds±15Vregulatedvoltagestothe
voltagecontrolcircuitandprotectivecircuit.Theinput
voltageisfull-waverectifiedbyD101throughD104and
isregulatedto±15V byOt01,D105,Q102andD106.
The+15V voltagealsoisusedtocreatea highly-stable,
accurate6.2V referencevoltagethroughD107a high-
temperaturecompensationzenerdiodeD108.The vol-
tageobtainedatD107isusedasthereferencevoltagefor
theovercurrentprotectivecircuit.
DifferentialAmplifier
Thisamplifiercontrolstheoutputvoltage,beingcom-
prisedof IC101, Q103,Q104andQ105.Theoutput
voltagecanbevariedwithVR1.Theadjustedvoltageis
amplifiedby IC101, ispassedthroughQ103,andis
voltageandcurrent-magnifiedbyDarlingtonamplifierof
Q104andQ105.Themagnifiedvoltageisfedthrough
theemitterfollowertothesucceedingCurrentAmplifier
stage.TheDifferentialAmplifierisstableandquickin
respondingtoa loadchangeandthelikesothatIC101
isofopenloopamplifier.
OvercurrentDetector
Thisdetectorisa protectivecircuitthatpreventsan
overcurrent,beingcomprisedofQ106,IC102andQ107.
Thevoltageinducedacrosstheoutputcurrentdetecting
resistorR12iscomparedwiththereferencevoltage
givenatD107inthecomparatorcircuitIC102.Ifthe
outputcurrentreachesitsovercurrentlimit,IC102
operates,theoutputofwhichpromptsQ106toturnon
tosuppressthebasepotentialofQ104.Thisprevents
theoutputcurrentfromincreasingmorethanlimited.
TheOvercurrentDetectorI hasa droopingconstant-
currentcharacteristic.Whentheprotectivecircuitisin
action, Q107turnsonthelight-emittingdiodeD3,
whichindicatessuchanaction.
CurrentAmplifier
ThiscurrentamplifierconsistsofQ1throughQ7,01
beinganemitterfollower.TheremainingQ2through
Q7areconnectedinparallel.
Light
Thislightisanovercurrentindicatorlight-emittingdiode
(LED).
5

5.CONTROLSANDWHATTHEYDO
6

FrontPanel
REF.
NO.
PANEL
INDICATION FUNCTION
1 A DCammeter,7Aandhigherzoneofwhicharecoloredred.
2 V DCvoltmeter.
3 OVERCURR LEDOvercurrentindicator,whichlightswhenoutputcurrentexceeds
overcurrentlimit.
4 LEDpower-onindicator,whichlightswhenPOWERON-OFFswitch
isturnedon.
5 POWERON/OFF Poweron-offswitch,whichturnsonPR-657atONposition.
6 OUTPUTON/OFF Outputon-offswitch,whichturnsonoutputvoltageisfedto
load.
7 VOLTAGE Outputvoltagecontrol,whichraisesvoltageupwhenturnedclockwise.
8 OUTPUTSELECTOR
i-n-ni
Presetvoltageswitchwhichswitchesoutputvoltagetoanyofthreevalues.
9 OUTPUTSELECTOR
PRESET/VARIABLE
Preset-variablevoltageselectorwhichatsupperpositionallowsswitch8 toselect
presetvoltageandatlowerpositionallowsVOLTAGEcontrol7 tovaryoutput
voltage.
to Negativeconnectortowhichnegativeloadisconnected.
11 Groundingconnectorearthedtochassis.Inuse,besuretoconnectthistopositive.
(+), negative(-)orCOMconnectorwithshortbar.
12 © Positiveconnectortowhichpositiveleadofloadisconnected.
7

RearPanel
13. PANEL/REMOTE Panel/remotecontrolselector,whichwassetatPANELpositionatfactory.For
remotevoltageselection;removestoppertoswitchselectortoREMOTEposition.
14 REMOTEINPUT Remotecontrolconnector.Forremotevoltageselection,connectremotecontrol
switchboxtothis 7-pin connector.
15 Linevoltageselectorofplugtype.Plugcanberemovedbypullingbackward.
Wheninserting,plugarrowmarkmustdirectratedlinevoltage.
16 Fuseholdercontaining3 A fuse.Capwillberemovedbyturningcounterclockwise
withPhillipsscrewdriver.
17 Powercableconnector.
6.HOWTOOPERATE
(DUsingVOLTAGEControl
ForoperationwiththeVOLTAGEcontrol7 onthe
frontpanel,setupthecontrolsasillustratedinFigure2.
1. SetthePRESET/VARIABLEselector9 to "VARI-
ABLE".
2. SetthePOWERON-OFFswitch5 to"ON".The
power-onindicator4 willlighttoshowthatyour
PR-657isreadyforoperation.
3.AdjusttheVOLTAGEcontrol7 clockwisefora
desiredoutputvoltage.
4. Firmlyconnecta loadtotheoutputconnectors10
and12,whicharefloatedfromthechassis.Placethe
shortbarbetweeneitheroftheseconnectorsandthe
groundingconnector.Ifnot,hummaybeinduced
intheoutputline.
5.TurntheOUTPUTON-OFFswitch6 to"ON",by
whichtheoutpriltagewillbesuppliedtothe load.
Fig. 2
8

20V
OutputCurrent 7.2A
NOTE: Iftheoutputcurrent-exceedsaround7.2A,the
overcurrentprotectivecircuitoperatesand
turnstheovercurrentindicator4 on.Thecircuit
hasa droopingconstant-currentcharacteristic
asillustratedinFigure3.
(2)AdjustingPresetVoltages
Toadjustthepresetvoltages,setupthecontrolsonthe
frontpane!asillustratedinFigure4.
1. SetthePRESET/VARIABLEselector9 to"PRE-
SET".
2. SetthePRESETswitch8 to "I".
3.AdjustthePRESETI semi-fixedcontrolontheright-
handsideclockwisewitha standardscrewdriveruntil
theV meter2 readsa desiredvoltage.
4. Similarly,proceedwithadjustmentforthePRESET
IIandIIIvoltages.
.5.Thiscompletesthepresetvoltageadjustment.Turning
thePRESETswitch8 to"l"r"JT-and"ID"-will
producethepresetvoltagesinsequence.
NOTE: Thepresetpositionoutofuseshouldbesetfor
0V outputvoltageforsafetyoperaiton.
STANDARDSCREWDRIVER
P -«e 4
7.28A
Figure3
Output
Voltage
9

(3)UsingRemoteControlSwitchBox(option)
Toremote-controlyourPR-657,setupitandtheremote
controlswitchbox;.
IMPORTANT
TurnthePOWERON-OFFswitchto"OFF"before
startingset-upprocedures.
1. Connecttheremotecontrolswitchboxcabletothe
REMOTEINPUTconnector14ontherearpanel.
2. RemovethestopperfromthePANEL/REMOTE
controlselector13andsetthisto"REMOTE".
3.Thisisreadyforremotecontroloperation.Tuning
theremotecontrolswitchwillselecteitherofthe
threepresetvoltagesI,IIandMlandthevoltageset
bytheVOLTAGEcontrol7.
CAUTION• •
Formakingtheremotecontrolswitchbox
Usea 6-coreshieldedcable.Donotextenditlongerthan
2m. Besuretousea shortingtypeofswitch.
Fic/"""\5 """^iire6
10

7.CAUTIONSFORUSE
(4)ConnectingTwoorMoreOnitsofPR-657inSeries
TousetwounitsofPR-657,connecta loadasillustrated
below.Thesumoftwooutputvoltagesisappliedacross
the load.
1. DonotuseyourPR-657setindirectsunlightsince
thiswillcausetheinternaltemperaturetorise,result-
inginunstableoperationanddamagingoftheinternal
components.
2. Avoiduseathightemperaturesandhighthumidity.
3.Donotuseinlocationswhereservervibrationsare
producedornearplaceswherestrongmagneticfields
orshockvoltagearegenerated.Otherwisethetransis-
torswillbeadverselyaffected.
4. WhenusingyourPR-657setwithotherequipment
whichiseasilyaffectedbypowerlinefluctuations,
suchasanoscilloscope,theotherequipmentwillbe
adverselyaffectedifthepowersupplysetisplaced
closetoitoratopit.Therefore,placethepower
supplysetasfarawayfromtheotherequipmentas
possible.
5.Forconnectionof load, firmlytighteneachconnec-
tor.Theloadleadsshouldbewiredasshortas
possible.Poorconnectionandhighwiringresistance
resultinunstableoutputvoltages.
6.Donotputanymatterclosetotheventilation
openingsonbothsidesandrearpanelasthe con-
trolledtransistorsareforciblycooledbyfan.
7.Replacingthefuse
a. Openthefuseholderusinga Phillipsscrewdriver.
b.Replacethefuse.
CAUTION: Besuretoselectthefuseofratedcapaci-
ty. Fora 100and120V AClines,usea
5A fuse;a 220and240V AClines,a
3A fuse.
E0= E1+ e2
Figure7
CAUTIONS
1. Theprotectivediodesused shouldhavehigherthan
7.5A averageforwardcurrentandhigherthan50V
inversepeakvoltage.
2. Inneedingthepositiveploarityatthe load, connect
shortbarattheposition(a).Fornegativepolarity,
placeitattheposition(b).
11
PR-657 PR-657
PROTECTIVEDIODES'
LOAD

8. PARTSUST OFPR-657
SCHEMATIC
SYMBOL
PARTS NO.
DESCRIPTION
REMARKS
RESISTOR
R1
RS14AB3D1R5J Metalfilm
1.50
±5%
2 W
R2
RW14BA2H010J Wirewound
1a
±5%
1/2W
R3
RS14AB3DR47J Metalfilm
0.47n
±5%
2W
R4
RW14BA2H010J
Wi rewound
in
±5%
1/2W
R5
RS14AB3DR47J Metalfilm
0.47O
±5%
2W
R6
RW14BA2H010J
Wi rewound
1 a
±5%
1/2W
R7
RS14AB3DR47J
Metalfilm
0.47O
±5%
2W
R8
RW14BA2HQ1QJ
Wi rewound
1 n ±5% 1/2W
R9 RS14AB3DR47J Metalfilm
0.47n ±5%
2W
R10
RW14BA2H01OJ
Wirewound
ia
±5%
1/2W
R11 RS14AB3DR47J Metalfilm
0.4712 ±5%
2W
R12
RW98AA3H R 33J x 2
(paralleling)
Wi rewound
0.15a ±5%
10W
R13
RW98AA3DR 10J
Wirewound
0.1a
±5%
2W
R14
RW98AA3H331J Wirewound
330n
±5%
5W
R19
RW14BA2H010J Wirewound
1 a
±5%
1/2W
R20
RS14AB3DR47J Metalfilm
0.47a
±5%
2W
R21
RD14BB2E102J •'
Carbon
1kn
±5%
1/4W
R22'
RD14BB2E223J Carbon
22 kO
±5%
1/4W
VR1
R03-3501-08 Variableresistor
20kO,B
VR2-4 R01-3501-08 Variableresistor
20kOB
CAPACITOR
C1
C91-0515-08 Electrolytic
15000MF
63WV
C2
CQ92M1H104K Mylar
OJMF
±10%
50WV
03
CE02W1H101 Electrolytic
IOOMF
50WV
12 '

SCHEMATIC
• SYMBOL
PARTS NO.
DESCRIPTION
REMARKS
C5~8
C9
C10
C11
CK45D2H103M
CK45D1H103M
CK45D1H473M
CE02W1H2R2
Ceramic 0.01.MF' ±20%500WV
Ceramic 0.01/AF ± 20%50WV
Ceramic 0.047juF ± 20%50WV
Electrolytic 2.2,aF 50WV
Q1~7
SEMI-CONDUCTOR
TransistorSDT9308or2SD113
D1
D3, 4 DiodeKBPC2502
LightemittingdiodeGL-52AR
A01-0817-18
A13-0713-18
A13-0714-08
A20-2714-18
A22-0805-18
A23-1610-08
A40-0704-18
MISCELLANEOUS .
Case
Frame(1)
Frame(2)
Panel
Sub-panel
Rearpanel
Bottomplate
M2
M1 B31-0704-08
B31-0705-08
B40-0765-04
B41-0705-04
B50-2838-00
D32-0075-04
E03-0201-05
E06-0761-08
E07-0761-08
E08-1081-05
E09-0681-05
Voltmeter
Ammeter
Nameplate
Nameplate(powersource)
Instructionmanual
Switchstopper
Powerconnector
Connector(receptacle,forremotecontrol)
Connector(plug,forremotecontrol)
Linevoltageselector(receptacle)
Linevoltageselector(plug)
13

-SCHEMATIC
'SYMBOL PARTSNO. DESCRIPTION REMARKS
E21-0150-03 Terminal(grey)
E21-0151-03 Terminal(orange)
E21-0653-03
Terminal(blue)
E22-1081-08
Lugboard10P
E22-1581-08 Lugboard15P
E29-0506-04 Shortbar
E30-1818-05
Powercord
F01-0810-08 HeatsinkX6
F01-0811-08
Heatsink
F05-3021-05 Fuse3AX2
F05-5022-05 Fuse5AX2
F15-0704-08 Blindrubber(1)
F15-0705-08 Blindrubber(2)
F19-0703-04
Patch, forselector
H01-2825-08 Packingcase(individualpacking)
HI 0-0518-08
PackingmaterialX2
H20-1707-08 Protectioncover
H 25-0029-04
Polyethylenebag
J03-0010-05
RubberlegX4
J13-0033-15 Fuseholder
J21-2845-18 Heatsinkmountinghardware(1)
J21-2846-08 Fanmotormountinghardware(1)
J21-2852-08 Heatsinkmountinghardware(2)
J21-2853-08 Heatsinkmountinghardware(3)
J21-2854-08 Fanmotormountinghardware(2)
J31-0601-08 Spacer
J32-0811-08 Boss
K01-00F.8-25 Grip. ......^
14

SCHEMATIC
PARTS NO. DESCRIPTION REMARKS
SYMBOL
PARTS NO.
K29-0208-24 Knob,forleverswitch
K21-0283-04 Knob,forvariableresistor
T1 L01-9066-08 Powertransformer
SI S44-2501-08 Toggleswitch
S2 S44-4501-08 Toggleswitch
S3 S32-2013-05 Leverswitch
S4
S31-2040-08 Slideswitch
S5
S32-2012-05 Leverswitch
X65-1190-00 Mainunit
15

PARIS LIST OF X65-1190-00
SCHEMATIC
I SYMBOL PARTS
NO.
DESCRIPTION
REMARKS
RESISTOR
j R101,102
RD14BB2E102J Carbon
1 k«
±5%
1/4 W
I R103
RD14BB2E331J Carbon
330 n
±5%
1/4W
i R104
RD14BB2E201J Carbon
20012
±5%
1/4 W
i R105
RN14AK2E242F
Meta! film 2.4 kO
±1%
1/4W
j
R106
RD14BB2E102J Carbon
1 i<a
±5%
1/4 W
j R10?
RD14BY2H222J Carbon
2.2 m
±5%
1/2W
R108
RD14BB2E302J Carbon
3 kO
+ 5% 1/4 W
R109
RD14BB2E102J Carbon
1 kO
±5%
1/4 W
R'(1 0
RD14BB2E103J Carbon
10 ka
+ 5% 1/4
W
; R111
RD14BB2E112J Carbon
1.1kn
± 5% 1/4
W
:
R112
RD14BB2E103J Carbon
10 m
±5%
1/4W
j R113
RD14BY2H680J Carbon
68 n
± 5% 1/2W
' R114
RD14BB2E362J Carbon
3.6kO
± 5% 1/4
W
R115
RD14BB2E152J Carbon
1.5 ka
±5%
1/4 W
: R116,117
RD14BB2E102J Carbon 1 kO
I: 5% 1/4
W
;
R118
RD14BB2E511J Carbon
510 n ± 5% 1/4
W
: R119
RD14BB2E472J Carbon
4.7 k!2
± 5% 1/4
W
\ R121
RD14BY2H222J Carbon
2.2 kO
±5%
1/2 W
: R144
RD14BY2E3R3 Carbon
3,3 12
i5%
1/4 W
! VR101 R 12-1033-05 Semi-fixedresistor
2.2 k!2B
! VR102 R 12-1002-05 Semi-fixedresistor
1 k!2B
\C101, 102
CE04W1V221 Electrolytic
CAPACITOR
220MF
35 WV
16

SCHEMATIC
SYMBOL PARTSNO. DESCRIPTION REMARKS
C103, 104
C105, 106
C107, 108
C110
C114
CE04W1ER47
CE04W1E101
CE04W1E100
CQ92M1H153K
CQ92M1H103K
Electrolytic0,47 aF
Electrolytic100,uF
Electrolytic10juF
Mylar 0.015juF ±10%
Mylar0.01,uF± 10%
25WV
25WV
25WV
50WV
50WV
IC101,102 741CP
SEMI-CONDUCTOR
IC, Linear
Q101
Q102
Q103, 104
Q105
Q106, 107
2SD400
2SB544
2SC983
2SD525
2SC983
Transistor
Transistor
Transistor
Transistor
Transistor
D101~104
D105~106
D107
D108
D109— 111
GP10-4002
RD15EB
RD8.2EB
IN823
IN914or1S1588(IS953)
Diode
Zenerdiode
Zenerdiode
Zenerdiode
Diode
F01-0812-08 MISCELLANEOUS
Heatsink
J25-2824-08 Printedcircuitboard
17

i. P. 0. BOARD
18

10. SCHMATICDIAGRAM Thecircuitelementsmaybechangedwithoutnoticeowingtoa technicalinnovation.
19
PR-657

A product ol
KENWOODCORPORATION
17-5, 2-chome,Shibuya,Shibuya-ku,Tokyo150,Japan
©96002PR''^.DINJAPAN B50-2838-10 (KM)