Kenwood KRC-794 Schematics
A B C D E
1
2
3
4
5
6
7
IC1:
Q1 : DTC124EK or
(X87-3022-71)
J3CH CN
CXA2560Q
KRC103S
TAKEUP
REEL
2
SUB
CM2
MODE SW
SUPPLY
TAKE UP
FWD
REV
SUPPLY
REEL
MM
CM1
MAIN
PLAY
Lch
Rch
Rch
L
R
Lch
CN3
CN2
Q1
IN SW
S1
CN4
PACK
D22
EQ AMP
22K
22K
DPSS
PLAY
FF,REW
4.10V
4.06V
4.06V
4.06V
0V
4.06V
0V
4.03V
4.10V
4.04V
8.11V
4.06V
4.02V
4.12V
DOLBY
OFF
B,C :
: 0.4V
4.10V
DPSS
PLAY
DOLBY
DOLBY4.04V
B
C
OFF
4.06V
4.06V
4.02V
ON
1.23V
: 0V
: 4.73V
: 0V
: 4.43V
4.04V
4.06V
4.16V
0V
PLAY
FWD
REV
OFF,B :
C :
0.4V
DOLBY
: 0VON
: 2.9V
: 0V
0V
: 4.94V
ON : 4.77V
: 0VOFF
: 4.84V
MUTE
OFF
: 4.05V
METAL
: 0V
: 4.84V
: 0V
(X87-3022-71)
(X14-6442-73)
(E30-4942-05) : KRC-794/Y
DC CORD
IC1
TAPE MECHA (D40-1146)
1
4
3
2
REQ H
D GND
B.U.
CH CON
MUTE
A GND
RST
5713
8
RL+7RL-
351
RR-
FL+
FL-
FR-
FR+
RR+
642
B
PNK/BLK
BLU/WHT
8
GND
642
A
BU
ORG/WHT
1
2
YEL
EXT. CONT.
TEL MUTE
BRN
3
4
RED
BLK
BLU/WHT
ANT. CON
GRN/BLK
RR+5
VIOL
VIOL/BLK
RR-
RL-
6
7
RL+8
GRN
WHT/BLK
GRY
FR+
GRY/BLK
FR-
FL-
WHT
FL+
9
10
11
12
16
13
14
15
ACC
+B
+B
AC
LINE OUT2
TAPE IN2
OUT REF2
PB OUT2
1932
K
A
K
C
R11C7
C13 0.1
0.033
+5V
E
C
NC12
7 MODE2
3
+5V
E
9 F REEL
ANODE
R REEL
10
11
PON 5V8
2
1
MOED16
MOT-G
MODE3
4
5
+8V
10K
VR1
4.7
R13
1K0.01
+
47u10
C6
C11
0.1
4700P
C17 0.47
C20
1 SUB+
SUBMOT+B
2
3
1
W11
R5C15 33u10
+
180
R3 24K
C3 470P
1
2
3
4
C5
470P
R2
R1 24K
C1 470P
C2
+
24K
33u10
2
3
4
14MS OUT
PB REF
8
LINE OUT1
TAPE IN1
OUT REF1
PB OUT1
40
2
1
PB FB1
PBTC1
VCC
543
7
6
NC
PB GND
PB R IN1
39
PB F IN1
37
38
TCL1
TCH1
10
9
MSLPF
R8 220K
R10 33K
R9 2.7K
C24
C23
0.47
13
12
11
G1FB
G2FB
MSTC
36
VCT
35
33
PB GND
PB F IN2
34
PB R IN2
17
16
15
14
NR MODE
MUTE SW
NR SW
15
17
16
18
TAPE SW
DR SW
18
19
5
R4
470P
5
C4
24K
33u50
C16+R6
180
0.01 1K
C14 0.1
23
PBTC2
PB FB2
31
29
30
DIREF
GND
2627282425
0.1
C12
R7 20K
20
MS SW
TCL2
TCH2
MS
MODE
21
22
20
R12C8
VR2
10K
+8V
R14 10K
+B 8V4
3
R
GND
L
21
OUT R
A GND
OUT L1
2
3
DOLBY
MS OUT
B/C
DOLBY
ON/OFF
15 6
14 5
16 7
TAPE IN
F/R
MUTE
MTL
MS MODE
18
17 8
9
192010
11
12
D GND13
28
27
100K
29
26
R80
R72 4.7K
R71 100
R73 4.7K
R74 4.7K
DTA123JK
DTA124EK
DTC114YK
DTC124EK
DTC143TK
DTC143ZK
DTC144EK
KRC103S
UN5213
2SA1576A
2SB1218A
2SB709A
2SC2412K
2SB1277
2SB1443
2SA1037K
2SC4081
DTA114EUA
DTC144EUA
KRC104S
2SB1188
2SB1184
2SB1548 DAN202K
DAP202K
TC74HC02AF
M5237ML
TDA7479D
X14-6442-73 (1/4)
14
KRC-794/Y
F G H I J
D33
SW5V
Q20
B.U.5V AVR
Q21
Q22
Q23
D38
D39
D40
Q28
CN4
Q31
P-CON SW
MUTE
Q29
Q30
D52
POWER IC
J1
J3
D31
D51
J2
D32
Q32
D43
Q39
AUDIO 8V AVR
DC IN
Q19
D45 D46
Q
J3 TOP VIEW
Q73
Q72
Q18
D53
Q34
Q44
Q33
D41
E-VOL. N.C.,MPX
MOTOR
DRIVER
DIMMER
SW
EXTERNAL
CONTROL
AMP
ILLUMINATION
AVR
E-VOL
SW
MUTE
MOTOR
VOLTAG
DRIVE
SW
1
D21
D3
D1
D18
D16
D12
D14
D11D13
D15
D17
D37
Q25
DETECTION
ACC.
Q24
D36
B. U
DETECTION
SUPPLY
MOTOR
DRIVER
Q38
D42
Q37
Q36
SW 14V
N
B
PRE OUT
DRIVER
MUTE
Q71
D50
47K
10K
22K
22K
47K
47K
2.2K
47K
4
22K
22K
22K
22K
22K
22K
22K
22K
7.5V
7.5V
14.4V 7.5V
7.5V 8.9V 1.37V 1.37V
7.5V 14.4V7.5V
0V-4.1V 7.5V
5.0V
0V
5V
0V
5V
0V
5V
5V
0V
0V
5V
0V
5V
0V
5V
13.7V
1.26V
13
2
0V
7.5V
7.5V
0V or 5.0V
13.5V
CAS:3.9V
SRM:7.5V
13.5V
0V
3.6V
4.15V
4.15V
4.15V
4.15V
4.15V
4.15V
0V
5V
4.15V
4.15V
0-4.5V
0-4.5V
3.0-4.9V
0.3-3.8V
5V
0V
0V
8.3V
4.15V
4.15V
4.15V
4.15V
0v
0V
0V
0V
5V
1.25V
1.45V
3.9V
3.9V
0.6V-
0.6V-
0.6V-
7.5V
3.9V
0V
5V
0V
0V
0V
0V
0V
IC3
IC10
IC4
IC13
IC2
R109
22K
VIN VREF
R95
R96
C83 0.01
10u10
100u25
C85 100u6.3
+
C82
+
C84
22K
R93
100
R94
+
GND
4.3K
R89
220u10
C87
220
R92
15K
R901C86
24K
R87
2
1K
R108
1/2W
4.7K
3.3u25
C90
R104 4.7K
SUB +
1
11
Q28-31
1/2W
1
2
3
4
0.068
C92
+
0.1u50
R110 1K
+
C91
141312
5
6
7
1098
12
0.47u50
C111
+
FL
RL
3.9K
R136
FR
RR
TH1
13
FR+
RR+
FR-
RR-
C31
0.22u50
C33
0.22u50
+
22K
R13
22K
R11
22u16
C112
8
TAB
GND
RR-
STBY
RR+
VCC
FR-
1
2
356
7
4
FRIN
RRIN
FR+
SVR
GND
9
10
11
12
C34
0.22u50
0.22u50
1.5K
R134
C32
22K
R14
22K
R12
FL+
FLIN
RLIN
AUX IN
RL+
GND
RL-
VCC
GND
14
15
1617181920
21
CD
MUTE
FL-
GND
22
232425
RR+
FR+
RR-
FR-
RL-
FL+
FL-
RL+
2
3
10
RL-
FL+
RL+
FL-
12
9
FR-
RR-
FR+
RR+
ACC
TEL MUTE
P-CON
EXT. AMP CONT
ANT
GND
DIMMER
67345
13 11121415
8
BUP
16
10u16
C30
R10
4
3300u16
+
RL+
RL-
FL-
FL+
1u50
+
C114
15
195
4
3
62
11
10
12138
7
CH CON
MUTE
A GND
RST
Rch
REQC
DATA C
DATA H
Lch
CH CLK
1
2
3
4
5
6
7
8
9
10
11
12
13
REQ H
B.U
MUTE
Rch
A GND
REQ C
RST
DATA C
CH CLK
Lch
DATA H
D GND
CH CON
3
21
10
12
12
10
10K
R111
R112
100K
0.01
C93
R117
1K
560
R114
30
24
C94 1u50
+
+
R113
10K0.01
C95
VDD
VSS
22K
2.2K
C80
2200P
C81
R135
100
L12
SUB -
2
1
GND2OUT 2
4
3
IN 1
OUT 3
7
8
6
5
VCC 1
VREF
IN 3
IN 2
10
9
OUT 1
VCC 2
1.2K
R120
2.2
R121
2.2
R122
0.22
C99
0.22
C98
1W1W
3
10
484746
9
96
11 473
10 5
812
1
213
R34
3
2
1
CREF
VREF
27
O FL
NC
25
26
NC
28
4
CAS L
CAS R
O FR
24
CD L
VDD
8
NC
GND
21
CD R
5
7
6
CD GND
O RL
O RR
22
23
S MUTE
MPX
12
LEVEL
QUAL
17
AFS
10
11
AM/IF
SDA
SCL
19
18
15
14
MP OUT
NC
MP IN
NC
9
20
16
13
+
C132
100u10
0.01
C131
4.7K
R171
1K
R170
0.1
C137
0.01
C157
150P
C136
4.7K
R161
10K
R169
4.7K
R162
0.1
C138
0.033
C156
0.47
C135
C5 1
2.2u50
+
C133
C6 1
7
6
5
13
14
FR
FL
RR
RL
RR
RL
FR
FL
4
3
13
10
3
W103
4
0.1
C109
10K
R312
47K
R131
31
R124
750
R126
2.2
52
IC13
0.01
C108
+8V
+8V
+B
+B
+B
+5V
+5V
+5V
+B
+B
+5V
+B
+B
+B
+5V
+5V
+5V
+B
+B
+B
+5V
+5V
+5V
+5V
+B
+B+B
+B
+B
+B
+B
+B
+B
R107
19
47u6.3
27
100K
100K
100K
29
26
88
R80
R81
959496
R82
4.7
+
6
0.47u50
0.47u50
R72 4.7K
10
R3
R76 4.7K
R75 4.7K
R73 4.7K
R74 4.7K
R77 47
47
R78
R2
R1
10
C3
+
5
C2
+
7
C1
F1 10A
23
R103
R100
3.3K
C96
0.01
1/2W
18K
C89
0.01
R102
100K
R101
100K
C88
1000P
R99
5.6K
12K
R98
R97
12K
93
R116
100K 1.2K
R115
+B
11
+B
25
74
79
ILL +B
ILL +B
+5V
16
+B
+B
15
X14-6442-73 (2/4)
KRC-794/Y
Loading...