Kenwood KRC-778R Service Manual page 11

A B C
WHT GRN WHT
FL+ 8 16 RL+ FL+ 8
1
WHT/BLK GRN/BLK WHT/BLK
FL- 7 15 RL- FL- 7
GRY/BLK VIOL/BLK GRY/BLK
FR- 6 14 RR- FR- 6
GRY VIOL GRY
FR+ 5 13 RR+ FR+ 5
BLU/WHT PNK/BLK BLU/WHT
EXT. CONT.
P. CON 4 12 P. CON 4
BLU/WHT BRN BLU/WHT
3 11 TEL MUTE 3
RED ORG/WHT RED
2 10 2
BLK YEL BLK
1 9 1
2
2 4 6 8 2 4 6 8
A A
1 3 5 7 1 3 5 7
2 4 6 8 2 4 6 8
B B
1 3 5 7 1 3 5 7
3
DC CORD
DC CORD
(E30-4788-05)
(E30-4789-05)
KRC-PS978R/878R/778R/778RY
KRC-778RV/778RYV
(X87-301X-XX)
(X87-301X-XX)
MODEL UNIT
NAME No.
KRC-PS978R
2-70
KRC-PS988R
KRC-878R
KRC-778R/RY
4
KRC-778RV/RYV
0-11
KRC-X858
KRC-888
KRC-708
TAPE MECHA (D40-1138)
CN3 C16
33u50
5 5
Lch
+
4
REV 4
Rch
3 3
PLAY
2
Rch
2
FWD
C1 470P
Lch
1
5
R1 24K
1 1
C3 470P
M
MAIN MOTOR 2
R3 24K
3
C15 33u50
M
SUB MOTOR 4
+
9
TAKE UP
A C
8
7
K E CN1
6
9
A C
5 8 15
R16
7
K E 6 120
16
SUPPLY 5
6
4
4 14
3
3
13
C 1
3
2 2 12
2
MODE SW 1
1
19 18
CN4
7
D E F
(X14-618X-XX) (A/2)
GRN WHT GRN
16 RL+ 8 16
FRONT L REAR L 1 REQ H
GRN/BLK WHT/BLK GRN/BLK
15 RL- 7 15
2 D GND
VIOL/BLK GRY/BLK VIOL/BLK
3 B.U
14 RR- 6 14
FRONT R REAR R 4 CH CON
VIOL GRY VIOL
13 RR+ 5 13 5 MUTE
BLU PNK/BLK 6 A GND
ANT CONT 4 12 EXT.
PNK/BLK 7 RST
EXT. CONT. CONT
12
8 Rch
BLU/WHT
P. CON
3 11 9 REQ C
BRN
11 TEL MUTE RED ORG/WHT
10 DATA C
ACC 2 10 ILLMI
11 DATA H
ORG/WHT
10 BLK YEL 12 Lch
1 9 BU
GND
YEL 13 CH CLK
9
DC CORD
(E30-4779-05)
KRC-X858/708/888
WHT GRN
8 16
FRONT L REAR L
WHT/BLK GRN/BLK
D21
7 15
BU GRY/BLK VIOL/BLK
6 14
FRONT R REAR R
GRY VIOL
5 13
PNK/BLK
EXT.CONT D22
4 12
BLU/WHT BRN
P. CON/ANT CON TEL MUTE
3 11
RED ORG/WHT
ILLMI
ACC 2 10
BLK YEL
GND 1 9 BU
DC CORD
(E30-4781-05)
KRC-PS988R
(X87-301X-XX) (X87-301X-XX)
IC1 :
UNIT
IC1 C24 C25,26 R8 R9 R10 R11,12
No.
Q1 : KRC103S 2-70 Dolby BC CXA2561Q 0.047 YES 680K 3K 30K 2.4K
Dolby B
0-11 CXA2560Q 0.039 NO 560K 3.6K 33K 1K
0V
C26 56P
C8
0.01 R12 DOLBY
OFF : 0.4V
DOLBY
B,C :
OFF,B : 0.4V
C :
4.16V
FF,REW : 0V
PLAY : 4.05V
FWD : 0V
REV : 4.84V
4.06V
R6
180 31 MS 20
METAL
PB FB2 MODE 20
32 19 ON : 0V
1.23V
PB R IN2 DR SW 19
OFF : 4.84V
0V 4.06V
4.06V
4.04V 18
MUTE
TAPE SW 18
33 4.02V ON : 4.77V
PB GND R
DOLBY OFF : 0V
34
PB F IN2
4.06V ON : 4.43V
17
C5 33u10 35
OFF : 0V MUTE SW 17
VCT 4.04V
+ 36 16
DOLBY
PB REF NR SW 16
4.03V IC1
B : 0V 15
NR MODE 15
C : 4.73V
14
MS OUT 14
4.06V 37
PB F IN1 L 13
DPSS : 4.94V
MSTC
0V 38 PLAY 0V
PB GND 4.06V DOLBY 12 4.10V
OFF : 0.4V G1FB
DPSS : 0V
4.06V 39 11
PB R IN1 4.02V B,C :
G2FB PLAY : 2.9V
R5 40
8.11V 4.12V
PB FB1 C23
180
Q1
0.22
4.06V
22K
4.10V 4.04V
22K
C7
DOLBY
0.01 R11
OFF,B : 0.4V
C :
4.10V
C25
56P
R13
4.7
PACK 12
IN SW
10
S1
17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 3 2 1
CN2
G H I
J1
16 15 14 13 12 11 10 9
8 7 6 5 4 3 2 1
J3 TOP VIEW
CH CN J3
12 8 4
1 5 9
13 11 7 3
D31
10 6 2
2 6 10
9 5 1
C81
13
3 7 11 D3 +
0V
4 8 12
D1
C95
0.01
5V
R1 C1
0V
10 0.47u50
5
+
R2 C2
5.0V
10 0.47u50
5V
1
+
MUTE 0V
R3 C3
4.7 47u6.3 IC10
3 Q71
+
3 22K
38 25 5V
22K
0V
37
D50
16
39
0V
R83
100K 5V
0V
R80 100K
2
5V 5V 5V
R81 100K
18 0V 0V 0V
R82 100K
R79 100K
1
R143
D
Q56 4.7 Q62
DC/DC
Q55 CONVERTER
10.4V D56
IC6
DC/DC 10.5V
CONV.
1 8
DET
BOOST V+
Q58 Q59
Q60
2 R146
CAP+ 7
OSC
10.4V 47
0V 0V
6
3 LV
C118 GND
D55
2.2 4 5
CAP- VOUT
-9.8V
C117 Q57 Q57-62
DIF VOL.
2.2 0V
REGULATOR
-10V
2
W33
D40 Q28
3
D41
Q26 Q30
D39
4 22K
R106
22K
F
Q29
R109
22K R101
B.U DET 100K
22K
R110 1K
Q27 R98 R102
1/2W Q31
Q24
12K 100K
10K
10K
P-ANT
Q28,30,31 89
SW
47K P-CON SW
10K
86
EX AMP Q33,40,44
ILLUMI AVR
Q38
48 B.U.5V AVR
Q39
Q44 Q33 Q36
4.7K R124 Q37 Q22
MOTOR
Q21
750 DRIVER
DIMMER 2.2K
R115 AVR
R117 1.2K
R93 R94
1K 22K 100
Q40 D53 Q35 14V
Q32 D43
R111 D42
22K 47K
10K
47K
22K 47K
47K
J K L
IC4
14.4V 7.4V 3.2V 7.3V
POWER IC
0V
7.4V 7.4V 7.3V 7.2V 7.2V 7.3V
0V
14.4V A
4.5V D17
D18 7.3V
D15 4V
D16 7.3V 0V
7.4V
PRE OUT
D13
D14 OP AMP
IC7
D11
D12
0V 1
0V 2
0V 3
C111 C112 R135 C114
4
1u50 100u16 100 1u50
-B
-9.4V
+ + D51 +
SVR
SW R43 10K
Q51
D52 R136
10K 27K R37
Q3
47K
PRE OUT
MUTE
5V
0V
D6
5V
0V
IC5 8.1V
B
28
4.0V 1 VCC
35 AUX1 INL 27
4.0V 2 SDA
34 AUX1 INR
26
3
SCL
MUTE
Q61 25
C20 0.1 4.0V 4
DGND
CR1
0V
24
C19 0.1 4.0V 5
AGND
CL1
C143
C21 0.1 4.0V 6
23 4.0V 1u50
CL2
CREF
C22 0.1 4.0V 7
CR2
C11
22 4.0V 0.27
C13
4.0V 8 HP FL1
0.27
8 AUX2 OUTR 21 0V
HP FL2
4.0V 9
9 AUX2 OUTL 20 4.0V C12
HP FR1 C14
4.0V 10
10 HP FLOUT 19 0V 0.27 0.27
HP FR2
4.0V 11
11 HP FROUT
18 4.0V C15
12
HP RL1 C17
OUT REF
17 0V 0.27 0.27
HP RL2
4.0V
W7 13 16 4.0V C16
C18
13 HP RLOUT HP RR1
15 0V 0.27 0.27
W8 14
HP RR2
14 HP RROUT
SYSTEM E'sIC
4.0V
93
W4
RR
ACC DET W3
RL
Q25
W2
D37
90
FR
W1
FL
Q20
Q23
R119
A8V AVR
IC3 10K R118
R92 R90 C86 C MECHA
Q19 1K
220 1 3 15K 1 MOTOR
VIN VREF Q41
Q42 1/2W POWER SW
1.26V
GND
10K
SW5V
2
13.6V 0V
47K
47K VARIABLE3 TERMINAL
A8V
CONSTANT
47K Q18 VOLTAGE POWER
D44
4 3 2 1
CN4
M N O
PRE OUT
REAR FRONT
C
NON-
FADER
J2 CN6
4 3 2 1
C55 C56 C53 C54 C57
1000P 1000P 1000P 1000P 1000P
4V 4V
PRE OUT PRE OUT
OP AMP OP AMP
9.8V 9.8V 9.8V
IC8 IC9
8 0V 1 8 0V 1 8
+B +B +B
7 0V 7 0V 7 0V
0V 2 0V 2
6 0V 0V 3 6 0V 0V 3 6 0V
5 0V 4 5 0V 4 5 0V
-B -B
-9.4V -9.4V
R44 10K R29 10K R30 10K R57 10K R58 10K
R38 R23 R24 R51 2.2K R52 2.2K
Q4 Q1 Q2 Q6 Q5
PRE OUT MON FADER
PRE OUT
MUTE
MUTE
D5 D7
14
Q72
22K C137
C142
IC2 0.1
+
MUTE
22K
4.8V C135 R161
3.5V 4.8V 0.47 4.7K
12
5V 0V
4.0V C136
0V
120P
23
C157
SCL 11
C156
24 NC
SDA 10 0.018 0.027
0V 25 AM/IF 10
NC 9
26 NC 4.0V
GND 8
NC
7
8.1V
IC2 NC
6
27
E-VOL.NC.MPX NC
VDD
5 4.0V
28 CDL 5
NC 4 4.0V
4.0V 29 CDL OUT 4
OUT RR 3 4.0V
4.0V 30
CD GND 3
OUT LR
2 4.0V
4.0V 4.0V
4.0V 31 CDR OUT 2
OUT RF 1 4.0V
4.0V 32 CDR 1
OUT LF
33
NC
4.0V