![](/html/19/1988/198861d10fa31c012ac95b99f41c9987bf4ad5bbacd8e21093b4887171ff021a/bg1.png)
A B C D E
SYNTHESIZER UNIT (X14-689X-XX)
CLK
REQ C
R411 100
R408 4.7K
C404 0.01
R415 100K
7
5
6
R413 100K
R414 100K
R412 100K
63
18
17
+B
39
5V
0V
5V
0V
0V
IC8
1
2
3
4
5
6
7
GND
MUTE
DRIVE
PREOUT
MUTE DRIVER
VDD
14
13
12
11
10
9
8
IC1 :
1
IC2 : TDA7407D
IC4 :
IC6 : TDA7479D
IC7 : TDA3682ST
IC8 : HD74HC27FP
IC9 : HA12221F
IC10
IC11
IC12
Q1,301 : DTC124EUA or
Q10,11,20,101,201
Q40 : DTA124EUA or
Q50 : 2SA1036K
Q151 DTA114YUA or:
2
Q223,224 : DTC143TUA or
Q251 : DTC114YUA or
Q501 : 2SD1760
Q551 : 2SB1443
Q552 : DTC114EUA or
D1 :
D2,3 : 1GWJ43 (TPB5)
D4,551 : AM01Z or
D10,11,401,402
D20 : MA4051 (N) -M
3
D40,101,251-253
D102
D153,154,157,159-161,
∗
TDA7386
LB1930M
:
S-80835CNNB
:
: BR24C01AF
UN5212
2SC4081 or:
2SD1819A
UN5112
UN5114
UN5216
UN5214
UN5211
1N5393G-M6 or
S2V20 A
ERA15-01
: MA4068 (N) -M
MA4047-M or:D30
HZS5B1
: 1SS133
: B30-1567-05
403,404,407,409-411
MA4062-L or:
HZS6C1
ACC
RED
BLK
8
A-PART
75
B-PART
7B531
GRN
GRN/BLK
REAR. L
(E30-4792-05)
BATT
P.CONT OUT
ANT.CONT
BLU/WHT
WHT/BLK
FRONT. L
YEL
31
GRY
GRY/BLK
FRONT. R
64
6248
WHT
DC1
2
VIOL
A
VIOL/BLK
REAR. R
CH-IN
B.U.
+B
+B
D404
D407
D401
D402
D403
D409
D410
D411
GND
CON
REQ H
R404 100
R405 4.7K
44
J4
159
2
43812
MUTE
S GND
R403 4.7
R406 4.7K
+
C403 100u10
42
10
13
7611
Lch
Rch
RST
DATA H
DATA C
R402 10
R401 10
R410 100
R407 4.7K
R409 4.7K
C402 1u50+C401 1u50
+
16
SIGNAL LINE
GND LINE
B LINE
A1
CB
YES
X86-3512-70
NO
X86-3512-72
NO
X86-3512-70
NO
X86-3512-70
X86-3512-70
CASSETTE MECHANISM
(D40-1150-05)
YES
UPD780058GC418
NO
UPD780058GC426
UPD780058GC418
NO
UPD780058GC426
UPD780058GC418NONO
PACK
IC1
MODE
R111C308
YES
NO
NOYES
YES
FWD/REV
FWD/REV
R112
NO
YES
YES
R113
YES
YES
YES
NO
NO
4
5
(X14-689X-XX)
MODEL NAME
KRC-394Y (E)
KRC-37Y (E)
KRC-394 (E)
KRC-37 (E)
KRC-36 (E)
KRC-391 (E)
KRC-4904Y (E)
KRC-31Y (E)
KRC-366L (M)
KRC-466R (M)
+B
UNIT
No.
2-70
2-72
2-71
0-22
0-21 YES YES YES
PACK
M1M2
MAIN
HD1
+2V
SUB
M
M
7
6
T-END
5
STBY
4
3
2
1
PLAY
10
HEAD R
9
HEAD COM
8
HEAD L
7
6
GND
F/R
PACK IN
SUB(+)
SUB(-)
MODE+B
MODE
6
5
4
3
2
1
HEAD
Rch
Lch
+2V
CAUTION : For continued safety, replace safety critical components only with
manufacturer's recommended parts (refer to parts list).
Indicates safety critical components. To reduce the risk of electric shock,
leakage-current or resistance measurements shall be carried out (exposed
7
parts are acceptably insulated from the supply circuit) before the appliance is
returned to the customer.
• DC voltages are as measured with a high impedance voltmeter. Values may
vary slightly due to variations between individual instruments or/and units.
M+R
GND
T-END
STBY
GND
R114
NO
NO
NO
YES
YES
R146R118
YESYES
NO NONO
YESNONO
NO
YES YES
HEAD COM
Q301
YES
YES
NO
YES
MODE
MODE+B
SUB(-)
SUB(+)
PACK IN
GND
HEAD L
HEAD R
GND
STBY
T-END
GND
M+B
CN1
F/R
CN2
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
R533 470C532 0.01
R534 100K
R536
22K
R535
9
7
19
R556 470
R554 470
20
D551
Q551
1K
R552
470
R531
MOTOR
R551 10K
1/2W
10K
10K
Q552
+2V
+B +B
SUB MOTOR
DRIVER
IC10
6
0V 0V
PGND
7
7.6V
7
+5V
77
470
64
57
9
+B28
C511
1500P
C512
1500P
R513
C513
150
22u6.3
OUT2
8
NC
C533C534
9
7.6V
OUT1
10
NC
0.22 0.22
330K 5.1K
C516
R516
12K
0.01
+
C514
22u6.3
150
R514
3.8V
C509
1u50
+
0V
3.8V
15K
R511
3.8V
15K
R512
3.8V
+
C515
0.01
R517 R519
330K 5.1K
R515
12K
5
SGND
4
5.0V
IN2
IN1
NC
VCC
R520R518
31
NFI (R)
32
R IN (R)
33
RIP
34
F IN (R)
35
36
37
F IN (L)
38
V REF
39
R IN (L)
40
NFI (L)
58
3
5.0V
59
2
1
7.7V
+B
4.3K
R522
C518
0.1u50
3.8V
3.8V
302928272625242322
D IN (R)
M-OUT (R)
EQ OUT (R)
3.8V
EQUALIZER
AMPLIFIER
M-OUT (L)
RQ OUT (L)
D IN (L)
1
2
345
3.8V
3.8V
+
C517 0.1u50
4.3K
R521
+
IC9
3.8V
+B
3.8V
3.8V
RAI (R)
RAI (L)
PB OUT (L)
678
3.8V
PB OUT (R)
MS GV (R)
5V
S/R (MSGV)
0V
9
21
MA OUT
MS DET
5V
1V
MUSIC
MUTE
10
MS GV (S)
MSI
VCC
F/R
MTL
![](/html/19/1988/198861d10fa31c012ac95b99f41c9987bf4ad5bbacd8e21093b4887171ff021a/bg2.png)
X-XX)
VDD
TE
IVE
UT
DRIVER
JIHGF
D251
TH1
D252
R258 100
MT
RST
J5
R231R223
C223
D253
R259 22K
34
MUT
B.U
B.U
B.U
GND
GND
GND
T.MUTE
P.CON
ACC
A.5
RR-
RR+
RL-
RL+
FL-
RL-
RR+
R32 22K
C30 0.01
TEL
MUTE
78
D30
RL+
R20
FL-
FL+
FL+
3.3K
R22 47K
1234567 8 910 1112131415161718
R15
56K
R16
100K
Q11Q10
R1
4.7K
D2
SERGE
DET.
R14
D11
R2
82K
9
7
RR-
4.7K
9
7
10K
R30
R31 47K
5.0V
14
+5V
13
5V
0V
12
11
10
9
5V
0V
RST
Q40
22K
MT
5V
0V
22K
MUT
8
+5V
L1
C40 0.01
+B
+B+B
R10
D1
D10
30K
+
C1
3300u16
+5V
+B
C14
1000P
R11
10K
BACK-UP
DET.
D3D4
FR+
FR+
1/2W
C20 0.01
Q20
ACC
DET.
FR-
J2
FR-
R21
47K
D20
DC-IN/SP-OUT
R12 100K
R23 100K
21
22
+B
R256
R255 33K
47K
R263
IC4
POWER
AMPLIFER
C255 1u50
+
C256 100u10
+
Q251
1K
10K
Q251
35
POWER
40
IC SVR
SW
246
47K
GND
4.7V
14.4V
STBY
1
0V
+B
7.3V
8
10121416182022
SVR
VCC
GND
TAB
OUT2-
OUT2+
OUT1-
OUT1+
3
579
7.3V
7.3V
7.3V
7.3V
FR-
RR-
FR+
RR+
4.7K
R254
C252
C254
0.22u50
RR
RR
7.2V
4.7K
R252
0.22u50
IN2
11
7.2V
+B
7.2V
IN4
IN1
13
0V
C251
FR
0V0V0V
0V
GND
GND
7.3V
OUT3+
GND
IN3
1517192123
7.2V
FL+
4.7K
R251
R253
C253
0.22u50
0.22u50
FL
RL
14.4V
4.7K
+B
VCC
OUT3-
FL-
RL
3.3V
MUTE
OUT4+
OUT4-
RL-
RL+
0V
24
GND
CD
25
C258
R260
1u50
750R261
C257 1u50
R257
8.2K
+
R262
180K
50
430
+
D40
+B
+5V
+5V
+8V
77
1V
5V
2.5V
80
5V
0V
BU-DET
22
R107 47K
R109 47K
∗
R111 47K
∗
R113 47K
AV CONT
5V
0V
5V
0V
5V
0V
5V
0V
2.5V
1.6V
79
NOISE
5V
0V
5V
0V
5V
0V
5V
0V
IC2 TYPE 0
232425
0V
+5V
C106
22K
78
4700P
R141
4.7K
R142
78
77
76757473727170
PHONE
T-MODE
S-METER
5V
0V
R140
160K
AV REF 0
4V
0V
5.0V
VDD 0
+5V
XT1
5V
0V
C105
15P
IC
XT2
∗
IC1
SYSTE
u-COM
C10
0V
5V
0V
5V
0V
IC2 TYPE 1
TYPE 0
TYPE 1
26
0V
0V
0V
5V
0V
∗
R112 47K
∗
R114 47K
5V
0V
TYPE REF
MOTOR
282930
27
5.0V
5V
0V
5V
0V
PLL-CESDAFS
R116 4.7K
R115 2.2K
29
30
5
0
LO/DX
31
32
R117 4.7K
R118 2.2K
∗
32
MOTOR DRIVER
AVR
R537
C531
22
+
10u10
+8V
Q501
+8V
L201
FL
4.1V
262725
OUT FL
L
3
4.1V
RL
FR
4.1V
4.1V
24
OUT RL
OUT FR
CD RRPH-
5
4
4.1V
4.1V
5
4.7uH
RR
4.1V
8.3V
232122
OUT RR
CD GND
678
4.1V
4.1V
6
C201
47u10
+
C202
0.01
0V
VDD
E-VOLUME
CD L
AFS
9
4.9V
7
9
38
37
192018
SCL
SDA
GND
MPXAMLEVEL
11
10
C207 0.47
C206 0.015
R201 2.7K
R202 4.7K
11
10
5V
0V
4.1V
C210 0.033
C508
R504
0.01
24K
22
21
4.7
R502
C507
0.47u50
+
0.22u50
180K
C501
C505
+8V
47u10
R501
+
56
+
0.01
C502
IC2
C205 1
C204 1
28
AC OUT L
VREF
1
C203
AC OUT R
GREF
2
4.2V
+
2.2u50
MS GV (R)
MA OUT
MS DET
5V
1V
MUSIC
S/R (MSGV)
MUTE
10
MS GV (S)
MSI
VCC
F/R
MTL
R503
1.6K
4.0V
20
C506
19
0.01
18
4.0V
17
8.0V
16
15
54
14
55
0V
13
0V
12
11
5V
0V
Q201
S MUTE
12
0V
C209 0.1
C211 150P
3.6V
0V
R203
4.7K
R204
+5V
1K
0V
17
QUAL
MP IN
13
0V
13
4.7K
R205
16
15
MUX OUT L
MUX OUT R
MP OUT
14
3.8V
C208 0.1
∗
NOISE
DETECTION
5.0V
2.5V
∗
R146
2.2K
R104
5V
0V
5.0V
0V
100K
DSI
Q101
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
4.3V
0V
0V
DSI
PAN EL
AVSS
L-RST
L-CE
AVREF1
PLL-DATA
PLL-CLK
L-DATA L
L-DATA S
L-CLK
R- DATA
R-QUAL
CH-DATA C
CH-DATA H
CH-CLK
M-STBY
T-END
ACC-DET
21
22
21
D102
R143
+5V
B
240
5V
0V
2
5V
0V
5
6
+5V
R102
2.2K
8
R103
2.2K
10
11
R105 2.2K
12
R106 2.2K
13
14
15
16
17
18
19
20
28