Kenwood C-v751 Service Manual

STEREO INTEGRATED AMPLIFIER/TUNERC-V751SERVICE MANUAL
© 1999-8/B51-5566-00 (K/K) 1992
70%
Caution : No connection of ground line if disassemble the unit.
Please connect the ground line on rear panel, PCBs, Chassis and some
others.
ON/STANDBY
PHONES
INPUTTAPE  2
/ MONITOR
VOLUME CONTROL
DOWN
UP
DIGITAL
REC
TIMER
MODERDS
PTY
DISPLAY CLOCK
TA/NEWS
DTS
A.MEMO
AUTO BAND
TUNING PTY SELECT LISTEN
MODEMULTI.CONTROL
LEVEL
OPEN/CLOSE
SET UP SOUND
INPUT MODE
DIGITALCIRCLE
SURROUND TIMER
SET
ANTENNAAM
FM 75W
GND...

Batteries (R06/AA) (6)
FM indoor antenna (1)
(T90-0841-05)AM loop antenna (1) (T90-0833-05)
Loop antenna stand (1)Remote control assy
GRC-700 (1)
(A70-1300-05)
Battery cover(A09-1139-08)
ENTERVOLUMEUP
DOWN CONFIRM
ON/STANDBY CONTRASTBacklighteditmoviemusicsoundlistenmodeSleep
C-V7512
CONTENTS / ACCESSORIES
DISASSEMBLY FOR REPAIR
CONTENTS / ACCESSORIES .................................. 2
DISASSEMBLY FOR REPAIR ....................................2
CIRCUIT DESCRIPTION...

C-V751
3
CIRCUIT DESCRIPTION
DESTIN-
ATIONu-COM
DESTINATIONBANDRECEIVING
FREQUENCY
RANGECHANNEL
SPACEIF PLLTUNER  SW
TSW4    TSW3   TSW2    TSW1
(22)       (21)      (20)       (19)
E/XE3
RDSFM
AM87.5MHz~108.0MHz
531kHz~1602kHz50kHz
9kHz+10.7MHz
+450kHz25kHz
9kHz0101
TE4
LW
RDSFM
MW
LW87.5MHz~108.0MHz
531kHz~1602kHz
153kHz~279kHz50kHz
9kHz
9kHz+10.7MHz
+450kHz
+450kHz25kHz
9kHz
9kHz0110
FREQUENCY FREQUENCY
M.ch
E/X TM.ch
E/X T
1 FM 98.0MHz FM 98.0MHz 21 AM 531kHz LW 270kHz
2 FM 87.5MHz FM 87.5MHz 22 FM...

C-V7514
CIRCUIT DESCRIPTION
Pin No. Pin Name I/O DescriptionACTIVE
HL
1 AMUTE O Audio muting control. Mute:ON Mute:OFF2 POWER O Power ON/OFF relay control. Power:ON Power:OFF3 POWER O Power amplifier relay control. Power:ON Power:OFF4 F RLY O Front speaker relay control. Relay:ON Relay:OFF5 C RLY O Relay control of center,surround and SW woofer. Relay:ON Relay:OFF6 S RLY O Rear speaker relay control. Mute:ON Mute:OFF7 +3dB O +3dB attenuation control for super woofer. ATT:ON ATT:OFF8 20dB O +20dB...

5
C-V751
CIRCUIT DESCRIPTION
KS1(15pin) KS2(16pin) KS3(17pin) KS4(18pin) KS5(19pin) KS6(20pin) KS7(21pin)
TAPE2
MONITORINPUT
AUTO -*TA/NEWS/
INFO.SRS -
-INPUTBANDLEVEL
*PTY DTS -
TIMER
MODETIMER
SETAUTO
MEMORYLEVEL
*DISPLAY DOLBY.DINPUT
MODE
TUNING
TUNING
D.REC MODE SET UPTIMER
CLOCKSOUND
Pin No. Pin Name I/O DescriptionACTIVE
HL
65 ERR I Detection port of error. ERROR66 AC3 I Detection port of dolby digital.67 FREQ1 I Detection port 1 of sampling frequency.68 FREQ0 I Detection port 0 of sampling...

6C-V751
CIRCUIT DESCRIPTION
INPUTS1 L/R
VIDEO1
RECS2 L/R
VIDEO2
RECS3 L/R
MD
TAPE1S4 L/R
INPUT
-6dBS5 L/R
INPUT
0dBS6 L/R
INPUT
-3dBS7 L/R
TAPE2
ONS8 L/R
TAPE2
OFF
TUNERCD
MD/TAPE1
X
DVD/DVD6ch
VIDEO1 XVIDEO2
X
INPUT LEVEL
0dBX
X
INPUT LEVEL
-3dBXX
INPUT LEVEL
-6dB
XX
TAPE2/MONI
ON
X
TAPE2/MONI
OFFX
INPUTS1
L   R
S2
L   RS3
L   RS4
L   RS5
L   RS6
L   RS7
L   RS8
L   R
TUNERXXXXXXXX X X X
CD XXX
XXX X X X X
MD/TAPE1 X
XXXX
XX X X X
DVD/DVD6chXXXXXXXX X
XX
VIDEO1
XXXXXX
XXX X
VIDEO2 X X
XX
XX X X X X
REC...

7
C-V751
ADJUSTMENT
No. ITEMINPUT
SETTING OUTPUT
SETTINGTUNER/AMP 
SETTINGALIGNMENT
POINTSALIGN FOR FIG.
SELECTOR : FM
1DISCRIMINATOR
DISTORTION(A)
98.0MHz  MONO
1kHz, ±40kHz dev 
60dBu (ANT INPUT)Connect a DC 
voltmeter to CN2
 on tuner
PCB.MONO
98.0MHzL31 (T)
L4(E,X)0V
(a)
TUNED LEVEL
(E,X type only)(C)
98.0MHz  MONO
1kHz, ±40kHz dev 
20dBu ANT INPUTMONO
98.0MHzVR1Adjust VR1
and stop at
the point 
where FL
(TUNED)
goes ON.(a) (B)
-L32 (T)
L5(E,X)Minimum 
distrotion
3 2
DISTORTION 
(STEREO)(C)
98.0MHz...

PLAYJ1
VIDEO1
J3 J2
J7J7 J7 J4 RchLch
J5
PRE OUT 1
2
Lch1
Rch2
Lch5
Rch6
Lch1
Rch2
Lch3
Rch4
Lch5
Rch6Lch1
Rch2
LSch3
RSch4
Cch5
SWch6
Lch 1
Rch2
3
4
5
6 Rch43
Lch RchLch
43 REC VIDEO1
PLAY CD PLAY VIDEO2
MD/TAPE1
REC
MD/TAPE1
PLAY
TAPE2/MONITORDVD/6ch
INPUT
SWchCch RSchLSch
J6
CONNECT WITH
POWER AMPLIFIRECN1 E3WH3
E4
HEADPHONES J8CN13
CN6 CN5 CN12
E2WH4
E1
J3
SYSTEM J2MONITOR
OUT
REC VIDEO1
VIDEO1 IN
VIDEO2 IN
6ch IN 2 1
CONTROL J4 J1
DVD COAXIAL IN
A1
CN1WH1
E1
WH2
CN1CN2CN3
CN1CN2
CN4CN4 WH2
E2CN3...

9
ACEBD
2 1
3
5
7 4
6
Refer to the schematic diagram for the value of resistors and capacitors.PC BOARD
(Component side view
)
Q2
Q1
D1
Q11
Q10IC3
D7D16
D13
D11Q9
Q8
Q12
Q6 Q3Q4D8
Q14Q15
Q7
R75C84
C92
C93C88
R89
C91C89 C90
C35
C87
R32/W60
R29C8C58
C56 C57
C61
C60
C36
R43 R48
R66
R63 R62
R69
R67
R68
R18R19
R34
R33
R20
C69
C63
W85
W59 W81W86
C81
C5 R84
C6
C1C2
C3
C82
C78 C75
C11
C12
C39
C25C26
C24
C42
C41
C30
C22
C52 C45
C47
C50 C51
C18
C20C43
C44R55 R79
R56
R53
R54
R57
R51
R52
R49 R42
R80R82
R11
R14
W56...

10
FGIHJ
2 1
3
5
7 4
6
PC BOARD
(Component side view
)
10
1
10
6
1
TAPE2 INPUT POWER T.CLOCK T.MODET.SET D.REC SETUP
DISPPTY TA/NEWS/INFOSOUND
MODEINPUT
61
GND +5V
VOLUME 
CONTROL
DOOR
R1R16
R12
R13 R14
W36
W37
W35
W11
W7
W14
W4
W20
W31W27W26
W30 W28
W29W25W24
W5W3
W12
W34
W10
W23 W22 W9 W2
W8
W6W18
W21
W16W19
125
AUTO A.MEMO DOLBY.D SRS
BANDMODELEVEL CONT
TUNING
R11
C1 R15 W32
R32
R31
R34
R2
R35
R3
R5 R4W38
W13
R25R24
C2R29
R28 R91 R21
R94 R93 R92 W41
C4R52
R51 R69
C5C3 R76
R70
R71
R72
R73
R74
C9
C12...