Kenwood KRC-108S User manual

© 1999-12 PRINTED IN JAPAN
B51-7576-00 (N)1789
CASSETTE RECEIVER
SERVICE MANUAL
KRC-108S/188
KRC-108S
KRC-188
Knob (EJECT)
(K27-3554-03)
Escutcheon
(B07-2181-02) LCD (B38-1024-05) Panel (A64-1932-02)
Cassette lid
(A53-1675-03) Knob (REW) (K27-3556-04) Knob (FF) (K27-3555-04)
Knob (EJECT)
(K27-3554-03)
Lever
(D10-3031-04)x2
Mounting hardware
(J21-9491-03) DC cord (E30-4783-05) : KRC-108S
(E30-4784-05) : KRC-188
Stay
(J54-0606-04) Screw set (N99-1632-05)
Escutcheon
(B07-2181-02) LCD (B38-1024-05) Panel (A64-1933-02)
Cassette lid
(A53-1677-03) Knob (REW) (K27-3556-04) Knob (FF) (K27-3555-04)
KRC-108S
KRC-188

2
BLOCK DIAGRAM ........................................................................................ 3
MICROCOMPUTER’S TERMINAL DECRIPTION ........................................ 4
ADJUSTMENT ............................................................................................. 6
PC BOARD.................................................................................................... 7
SCHEMATIC DIAGRAM ............................................................................. 11
EXPLODED VIEW....................................................................................... 15
PARTS LIST ................................................................................................ 17
SPECIFICATIONS ....................................................................BACK COVER
CONTENTS
KRC-108S/188

KRC-108S/188
3
BLOCK DIAGRAM
IC1
KEY
MUTE
B.U DET. B.U
ACC
P-CONT.
MUTE
PRE
POWER IC
EQ. AMP
AMP
NC/MPX
E-VOL. FRONT Lch
FRONT Rch
REAR Lch
REAR Rch
J2
LED
TAPE MECHA
MAIN IC5
1 Lch
2 Rch
PRE OUT
IC2 IC4
IC3
SP OUT
REAR
RST SW
RST IC
PST9130NR
IC6
ACC DET.
P-CONT.
ANT-CONT
J2
J5
HD74HC27FP
40W TDA7384A
FM+B
Q201
AM+B
Q203
5V
AM BPF
FM BPF
Q450,451
Q62
Q50
Q350
Q53
SW5V
Q56
8V
Q60
ILLUMI
BU5V
Q51
SYSTEM u-COM
TDA7400D
RST Q370
ANT-CONT
LA3161
M38258MCD FP
7SEG LCD
ED1
FM ANT
AM ANT
RF GND
FM+B
AM+B
OSC GND
OSC GND
OSC GND
VT
PLL +B
IFC OUT
SDA
SCL
DIG GND
IF1+B
IF1 GND
S-METER
IF2 GND
SD
FM+B
PON
ACC DET
B.U DET
SCL
MUTE
SDA
P CON
RESET
FWD/REV
MOTOR
Rch
COM
Lch
TAPE
MP IN
AM
MPX
OUT RR
OUT LR
OUT RF
LEVEL
SCL
SDA
OUT LF
STBY
MUTE
Rch
Lch
T-MUTE
FWD
REV
B.U
SMUTE
9
(FF/REW)
BU5V
AM+B
VDD 5V
PACK IN
ANT CON
BEEP
SVR
AMP. STBY
SVR
AC GND(BEEP)
Rch
Lch
TAPE :1681mV
AM :546mV
FM :1781mV
8V
RF GND
OSC GND
IF2 +B
AUDIO OUT
8V
S-METER
SD
PLL-SCL
PLL-SDA
HEAD
R55.6mV
BU5V
B.U.5V
8V
BU5V
AM: 170mV
FM: 400mV
L
PACK
IN
PLAY
FF/REW
ILL
9
KS0-KS4
KI0-KI3
25
25
SEG1-SEG22
COM1-COM3
AMP. MUTE
8V
BU5V
(X13)
M
F/E
KRC-188 ONLY

KRC-108S/188
MICROCOMPUTER’S TERMINAL DESCRIPTION
4
Microcomputer (M38258MCD066FP : IC1 : X14)
•Terminal description
Pin No. Pin Name I/O Signal Description Logic
1 C1 I (NC) Not used.
2 VL1 I VL1 LCD power input.
3-5 P67-65 I KI0-2 Key return input.
6-9 P64-61 O KS0-3 Key scan output.
10 ANO I SMETER Signal meter.
11 P57 O KS4 Key scan output.
12 TOUT O BEEP Beep output.
13 P55 O (NC) Not used.
14 P54 O MOTOR Mechanism motor ON/OFF. H: ON
15 P53 I FF/REW Mechanism FF/RWD detection. L: Detected.
16 P52 I PACK_IN Mechanism cassette pack-in detection. H: Detected.
17 P51/INT3 I KI3 Key return input.
18 P50 I FWD/REV Mechanism play direction detection. H: FWD
19-25 P47-41 O (NC) Not used.
26 P40 I SD Station detection. H: Station detected.
27 P77 O PLL_CLK IC3 clock output.
28 P76 I/O PLL_DATA IC3 data input/output.
29 P75 I IFC AM bandwidth. H: Station detected.
30 P74 O AM+B AM power output. H: ON
31 P73 O FM+B FM power output. H: ON
32 P72 O SCK IC2 clock output.
33 P71 I/O SDA IC2 data input/output.
34 P70 O (NC) Not used.
35 RESET I RESET Reset input.
36,37 P81,80 O (NC) Not used.
38 XIN - X_IN Clock input.
39 XOUT - X_OUT Clock output.
40 Vss - Vss Power input (0 V).
41 P27 I IC2_TYPE1 IC2 constant switching.
42 P26 I IC2_TYPE2 IC3 constant switching.
43 P25 O (NC) Not used.
44 P24 I SEL1 Destination type switching.
45 P23 I SEL2 Destination type switching.
46 P22 O MUTE Muting ON/OFF. H: MUTE
47 P21 O STBY Power IC standby control. H: ON
48 P20 O SVR Power IC SVR control. H: OFF
49 P17 I ACC_DET Acc detection. H: ACC OFF
50 P16 I BU_DET Momentary power down detection. H: Power down.

KRC-108S/188
5
Pin No. Pin Name I/O Signal Description Logic
51 P15 O P_MUTE Power IC muting control. H: Power down.
52 P14 O ANT_CON External antenna control. H: ON
53 P13 O P_CON Power control output. H: ON
54 P12 O ILLUM_ON Illumination control. H: ON
55 P11 O (NC) Not used.
56 P10 O SW5 5V power control. L: ON
57 P07 O EQ_MUTE Equalizer muting. H: MUTE
58-64 P06-00 O (NC) Not used.
65,66 P37,36 O (NC) Not used.
67,68 SEG23,22 O (NC) Not used.
69-90 SEG21-0 O SEG22-1 LCD segment output.
91 Vcc - Vcc Power input (5 V).
92 VREF - VREF A/D reference voltage input.
93 Avss - Avss Analog power input (Vss).
94 COM3 O (NC) Not used.
95 COM2 O COM3 LCD common output.
96 COM1 O COM2 LCD common output.
97 COM0 O COM1 LCD common output.
98 VL3 I VL3 LCD power input.
99 VL2 I VL2 LCD power input.
100 C2 I (NC) Not used.
MICROCOMPUTER’S TERMINAL DESCRIPTION
How to Read the Destination Type
The destination type is set by reading the following microcomputer ports at
the time of reset-start of the microcomputer.
Once the destination type is read and set during the microcomputer
resetting, any change in the ports during the microcomputer operation will
be ignored.
Destination Type SEL1 SEL2
KLL
MLH
JHX
X: don’t care

6
Set the controls and switches as follows.
BALANCE : center position BASS : center position LOUD : OFF DOLBY NR : OFF
FADER : center position TREBLE : center position
ADJUSTMENT
No. ITEM TAPE OUTPUT
SETTINGS RECEIVER SETTINGS
ALIGNMENT
POINTS
ALIGN FOR
CASSETTE DECK SECTION
[1] HEAD
HEIGHT SCC-1659 -TAPE PLAY Head Height
Screw
1) During FWD transport adjust (F) and (F’) so that
line A of 2-LINE TAPE passes trough the center of
the head shield plate (core center area)
2) During RVS transport adjust screws (R) and (R’)
so that line B of 2-LINE TAPE passes trough the
center of the head shield plate (core center area)
3) After the alignment above, reverse the trans-
port direction and check the FWD alignment again.
If it is deviated, perform alignment again. (Tape
used : SCC-1659, manufactured by A-BEX)
[2] HEAD
AZIMUTH TCC-153 10kHz
Connect a
AC voltmeter
to SP out.
TAPE PLAY
Head Azimuth
Screw
Adjust the azimuth for each Lch/Rch or FWD/RVS
becomes maximum
HEIGHT F
(FWD) HEIGHT
TAPE SPEED
(RVS)
HEIGHT/AZIMUTH
(FWD) HEIGHT/AZIMUTH
(RVS)
F
R
R
(2-LINE TAPE)
(FWD)
(RVS)
B
A
B
A
KRC-108S/188

78
PC BOARD (COMPONENT SIDE VIEW)
ABCDEFGHIJ
1
2
3
4
5
6
7
1
12
CN1
R4
R1
R2
R3
SRC
ATT
12345 6
AUTO
CLK
RST
BAND
AUD
D10
D11
D12
D7
D8
D9
D3
D2
D1
D6
D5
D4
X13-9660-10 (J74-0964-12)
R203 R201
R207
C154R206
C156
C157
C155
C151
R150
R205
W116
C210
C251
R251
R61
W115
R135
C14
R58
W118
R155
R15
W112
R14
R62
W113
R152
C52
R59
W109
R60
R57
W117
W114
R16
R13
W110
C153
C158
R372
R151
R156
C13
R52
R54
R352
C351
TH1
R154 R153
C54
R63
R64
C452
C202 C200
R455
R453
R454
R451
R450
C201
R452
R158
C1
R1
C2
R2
C5 C6
W121
C8
R8
R4
R6
C7
R7
R5
R3
C164
R134
C60
R108
W102
R250
W111
R101
R102
R103
W120
R120
R121 R123
R122
R157
C103
W104
C102
W103
W105
W106
C104
R109
R124
R125 R127
R126
R107
C101
W108
R114
R115
R117
R112
R131
R113
R69
W107
R68
R118
W101
EB
EB
BE
BE
EB
BE
EB
BE
EB
EB
BE
EB
BE
EB
28
15
14 1
1
7
814
13
54
80
81
100
1
30 31
50
51
EB
BE
EB
EB
EB
EB
BE
EB
EB
Q200
Q202
Q150
IC1
Q153
Q61
IC2
Q52
Q371
Q59
Q58 Q57
Q151
Q55
Q62
Q54
Q53
Q50
Q353
Q352
Q351
Q451
Q450
Q260
IC3
Q301
IC6
W83
W60
W66
W67
W86
W81
W85
W62
W59
W50
W25
L8/W11
W52
W78
W48
W10
W57
W55
W65
W63
C150
W76
W77
C206
L9
W74
W75
W80
W36
W26
W34
W18
W8
W2
W40
W24
W13
W73
C4
C3
W16
W15
W21
W72
L5
PL1
W1
W4
W19
L4
L10/W84
W7
W9
W69
W17
W5
W70
W12
W6
W20
W64
W28
W41
W61
W22
W47
W45
W30
W32
W53
ED1
W29
W54
W56
W51
W49
W27
W35
W58
W37
W31
W38
W44
W14
W23
W33
W46
W43
W68
W79
W39
PL2
R200
R202
C15
R55
R67
R350
R370
R373
C55 C56
R371
R307
R303
R50
R65
R351
R353
R66
C50
C160
R300
C161
C350
C352
C162
C159
R106
C58
C53
C57
L1
R261
R260
R302
C9
C250
C10
R301
R105
R104
R110
R340
X1
C152
C18 C16
C17
C451
C450
L3
R119
R111
125
24
281
9
16
51
1
8
1910 21 22 25
12 1
1
24
16
12
B
E
B
E
B
EBE
E
B
B
E
B
E
B
E
X14-6150-10/0-21
(J74-0960-12)
J2
A1
J1 IC4
J2
WH1
D261
P1
Q201
Q203
D200
Q60 Q56
D370
D50
Q370
D371
CN2
D151
D152
D150
D352
J5
Q51
Q350
D56
D52
D51
D55
D54
D350
D351
D53
D101
Q261
D260
IC5
CN1
D13
D102
D103
D104
D100
Refer to the schematic diagram for the values of resistors and capacitors.
IC Q address
16H
24F
34F
42G
55J
65G
50 4I
51 4I
52 4I
53 4J
54 3I
55 3I
56 2J
57 3J
58 4J
59 4J
60 3J
61 3J
62 4I
150 4F
151 3G
153 3F
200 4E
201 3E
202 4E
203 3E
260 5F
261 5E
301 5F
350 3H
351 4H
352 4H
353 4H
370 3H
371 4H
450 2F
451 2F

Refer to the schematic diagram for the values of resistors and capacitors. 910
KLMNOPQRST
1
2
3
4
5
6
7
PC BOARD (FOIL SIDE VIEW)
IC Q address
16P
24R
34R
42Q
54N
64R
50 4O
51 4O
52 4O
53 4N
54 3O
55 3O
56 2N
57 3N
58 4N
59 4N
60 3N
61 3N
62 4P
150 4R
151 3Q
153 3S
200 4S
201 3S
202 4S
203 3S
260 5R
261 5S
301 5R
350 3P
351 4P
352 4P
353 4P
370 3Q
371 4Q
450 2R
451 2R
W106
R151
W118
BE
R205
C210
W117
C202
W101
C200
C201
B
EB
R102
R101
W120
C101
R103
R113
R109
R108 R112
R107
100
1
C60
B
R206
C153
W116
BE
R207
C156
R135
R134
E
7
8
1
14
C164
R203
BE
C155
R150
C157
C154
C158
BE
R201
15
14
C14
R115
5
4
C104
R114
R117
R118
R69
W107
1
3
W108
R155
C13
28
1
C151
R157
R158
R156
BE
E
R154
R372
C103
81
80
C102
50
51
31 30
R121
R125
R122
R127
R123
R120
C5
R7
R3
C7
R5
R59
R68
R131
R124
R126
R57
C52
R352
BBE
C351
W114
E
R52
BE
EB
R54
C54
R58
C6
R8
R250
C8
R6
R4
C2
R2
C1
R1
C251
R251
W115
EB
BE
R60
R61
BE
EB
EB
R63
R62
R64
BE
R454
R451
R450
C452
R452
R455
BE
R453
BE
EB
W102
W105
W104
W103
W112
W111
R152
W110
R13
R16
R153
W121
W113
W109
TH1
R14
R15
BE
BE
Q151
Q260
Q301
Q202
IC3
Q200
Q150
IC2
Q371
IC6
Q351
IC1
Q50
Q352
Q353
Q62
Q59
Q58
Q53
Q54
Q52
Q61
Q153
Q450
Q451
Q55
Q57
R370
R350
W75
12
1
R261
R307
W1
B
E
L9
24
C206
L8/W11 L10/W84
1
ED1
C350
W51
W46
W13
R104
W10
W21
W4
R105
R106
R260
1
W15
W16
W19
1
W41
R300
R302
R303
R301
W33
R110
W23
W38
W44
W43
W18
W17
C152
6W9
W7
W5
W2
W14
W12
R202
B
E
E
B
R200
W6
W20
W31
W35
W29
W27
W22
W32
W30
R119
W37
W39
W45
W47
W49
W40
W28
W24
C150
W25
L3
R373
R371
B
E
W86
PL1
9
10
PL2
21
X1
W68
22
25
R340
C9
W85 C250
8
C3
C352
W53
W58
W54
W56
W61
W64
W72
W67
W66
W70
W69
C55
R353
E
B
W83
R55
R50
C53
C10
W73
1
W79
C56
W81
51
C4
R111
W78
B
E
W74
C58
R67
C57
B
L5
L4
C15
1
2
W8
C450
C451
C17
C160
C159
C18 C16
C161
C162
W50
W34
1
2
W26
W48
W36
25
24
W62
W63
W57
R351
W55
W52
W60
W59
W65
C50
16
8
W77
W76
R66
R65
E
L1
B
E
9
1
W80
D151
Q370
Q203
Q261
A1
D352
CN2
P1
D100
D261
D260
D103
D102
D101
WH1
D104
D200
D13
D152
D150
CN1
D52
D351
Q350
D54
D51
D350
IC5
D55
Q51
D53
D56
(J74-0960-12)
X14-6150-10/0-21
J1
Q201
J5
IC4
D371
D370
J2
D50
J2
Q60 Q56
12
1
CN1
1
2
3
ATT
R3
AUD
SRC
AUTO
45
R1
RST
BAND
R4
R2
CLK
6D2
D4
D9
D1
D10
D11
X13-9660-10 (J74-0964-12)
D8
D7
D5
D3
D12
D6

ABCDEFGHIJ
1
2
3
4
5
6
7
0V
4.1V 4.1V
5.0V
3.3V 8.3V 0V 3.3V 0.8V 1.3V
0V
7.2V
0V
0V
4.5V
14.0V
0V 7.2V 7.0V
7.0V
7.0V 0V
14.0V
3.8V 0V
7.2V 7.2V 7.2V 7.2V
0V
0V 5V
0.8V 1.3V
7.0V
1.8V
0V 4V
0V 5V
0V 5V
0V 5V
0V
5V
0V
0V 0V 0V
5.0V
0V
0V 5V
0V
5.0V
5.0V
3.4V
0V
0V
5V
0V
0V 5V
5.0V
0V 5V
4.0V
0V 5V
8.3V
4.8V
3.4V
7.2V 7.2V 7.2V
AM+B
19
23
20
21
22
AUDIO OUT
SD
S-METER
IF1+B
14
17
18 VDD 5V
IF2+B
15
16
SDA
SCL
DIG GND
10
11
12
13
OSC GND
VT
PLL+B
IFC OUT
7
8
9
OSC GND
OSC GND
OSC GND
FM ANT
3
4
5
6
AM ANT
NC
FM+B
1
2
RF GND
14
10u16
C450
+
270
R450
10u16
C451 R451
R454
100
R452
30K
2 Lch
R453
30K
R455
100
+
270
1
2
4
5 3 7 8 6
10
9
12
11
13
CDR
OUT LR
1 Rch
ACOUT L
ACOUT R
OUT LF
OUT RF
CREF VREF TAPER TAPEL
28 27 25 24 26 20
OUT RR
VDD
PH- CD L CD GND AM PH+
21 22 23
GND
MUX R
MUX L
SMUTE
SDA
SCL
QUAL
MPX MP IN LEVEL
18 19 15 17 16
MP OUT
16 15 14 13 12 11 10 9
8765 4 321
FL+
RL+
FL-
RL- FR-
RR-
FR+
RR+
P-ANT
P-CON
ACC
B.U
GND
2 4 6 8 10 12 14 16 18 20 22 24
GND
STBY
VCC
GND
SVR
RR IN
FL IN
AC GND
GND
VCC
MUTE
GND
1
3 5 7
9
11
13 15 17
19
21
23 25
TAB RR- RR+ FR- FR+ FR IN GND RL IN RL+ RL- FL+ FL- CD
19
23
17
21
9
3 7 5
17
23
21
19
L1
3300u16
C50
+
6
5
4
3
2
1
T.MUTE
GND
MOT GND
MOT +B
PACK IN
GND
10K
R261
1K
47K
R57
0.01
C52
47K
R55
R50 3.3K 1/2W
30K
R52
10K
R54
R350 4.7K
R351
1K
R352
3.3u25
C350
+
22K
C351
0.1u50
C352
+
1K 1/2W
0.068
4.7K
R16
0.22u50
C18
0.22u50
C15 4.7K
R13
0.22u50
C17 4.7K
R15
0.22u50
C16 R14
4.7K
100u10
C159
+
+
C160
10u16
1K
4.7K
430 1u50
+
180K
1u50
C162
+
R157
33K
750
0.01
C161R154R155
R156
23
24
25 26
0.01
C151
47u10
C150
+
L3 4.7uH
0.082
C158
4.7K
R150
0.1
C155
0.015
C153
0.22
C154
0.033
150P
C157
C156
C14
C13
1u50
C152
+23 IF1 GND
IF2 GND
0.01
C200
4.7uH
R205
150
27
28
4.7uH
10
26
C206 47u10
+
4.7uH
L5
1
2
3
4
5
FWD/REV
GND
HEAD R
HEAD COM
HEAD L
0.047
C251
10K
R251
1500P
C2
1500P
C1
22K
R1 22K
R2
100u16
C57
+
10K
100u10
C58
+
1K
R64
1K
R63
R65
2.2 1/2W
R66
2.2 1/2W
4.7K 2.7K
R207 R206
4
3
24
26
0.22 0.22
48 47
51
49
C56
100u6.35.6K
R61
+
47K
R60
10u10
R58
22K
100
R59
C55
+
C54
0.01
100u16
+
53
R68
100K
100K
R69
3 7 5
9
GND
7
6
5
4
3
2
1
9
8
11
10
12
13
VDD 14
+
0.022
4
C7
120K
R7
100u10100
+
100P
C5 C9
6.8K
R3
L IN 8
L NF
L OUT
7 6
C3
47u6.3
3
10
R250
120K
R8
C250
100u10
+
C8
0.022
C10
100u10
R4
100
GND
VCC
R OUT
5
4
100P
C6
R NF
3 2
+
+
C4
47u6.3
R IN 1
1/2W
0.01
C210
32 33
25 23
C53
F1 10A
5
3
2
4
1
GND1 PACK IN2
T. MUTE
MOT +B
MOT GND
GND
6
3
4
5
1/2W
TH1
C452
1
2
34
5
R373
R371
R370 4.7K
1K
22K
R372
1K
W83 W121
100
47K
0.22
100
R135
0.01
C164
30
31
R200
1K
C201
0.01
R202
1K
R203
22K
R201
22K W84
11
10
9
8
7
6
5
4
3
2
1
100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81
31
32 33
34
35 36 37 38
39
40
41
42 43
44
45 46 47 48
49
50
AM+B
PLL DATA
PLL CLK
SD
FWD/REV
KI3
PACK IN
FF/REV
MOTOR
REMO
BEEP
KS4
SMETER
KS3
KS2
KS1
KS0
KI2
KI1
KI0
VL1
VL2
VL3
COM1
COM2 COM3
AVSS
VREF
VCC
SEG1
SEG2 SEG3
SEG4
SEG5 SEG6 SEG7 SEG8
SEG9
SEG10
P-MUTE
ANT. CON
P-CON
ILLON
SW5
EQ-MUTE
SEG22
SEG21
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
FM+B SCK SDA RESET XIN XOUT VSS IC2 TYPE1 IC2 TYPE2 SEL1 SEL2 MUTE STBY SVR
ACC DET
BU DET
R102
12
11
10
9
8
7
6
5
4
3
2
1
RST
KI3
KS4
KS3
KS2
KS1
KS0
KI2
KI1
KI0
ILL +B
ILL GND
2.2K
R307
R110 1K
R106 1K
R105 1K
R104 1K
2
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
52
51
53
54
65
57
55
56
58
59
60
61
62
63
64
70
66
67
68
69
71
72
73
74
75
78
76
77
79
80
97
R103 10K R302 47K R303 47K R300 47K
47K
51
54
53
52
56
26
30
27
28
10
R301
56
47K
X1
8.664MHz
27P
C102
27P
C103
49
48 47 46 50
72
71
70
69
76
80
79
78
77
74
73
75
87 90
89
88 95 96 86 85
84
83 82
81
11
9
8
5
7
6
4
3
17
18
R67
1K
15
14
R260
14
15
R122 47K R123 47K R121 47K R120 47K R125 47K R127 47K
C104 0.1
2
31
33 32
54
R118
R117 1K
R107 2.2K
R111
100K
R109 47K
R108 47K
10K
R101
4.7K
R113 1K
R115
1K
10K
R114
10K
R119
5.6
R340 PL2 PL1
3
52
R134
C60
46
50
3
1
2
5
4
6
8
7
11
9
10
12
330
R3
R4
330
R2
330
R1
330
KI1
KI0
KS1
KS0 KI2
KS3
KS2
KI3
KS4
KI2
KI3
KI0
KI1
KS4
KS2 KS3 KS0
KS1
4
5
6
7
8
9
11
17
BU
YEL
ACC
GND BLK
RED
BLU 11
10
9
2
3
1
P. CONT OUT
REAR R
VIOL
VIOL/BLK
REAR L
GRN/BLK
GRN
BLU
GRY
GRY/BLK 14
13
12
6
5
4
WHT/BLK
WHT 16
15
8
7
ANT. CONT
FRONT R
FRONT L
BU
YEL
REAR L
REAR R
VIOL
VIOL/BLK
GRN/BLK
GRN
GND BLK 9
1
ACC
FRONT L
P. CON/ANT. CON
RED
BLU/WHT
10
11
12
2
3
4
GRY
GRY/BLK
WHT/BLK
14
15
13
7
6
5
FRONT R
WHT 16
8
GRN/BLKWHT/BLK
FRONT L REAR L
14
15
13
11
12
10
BATT BU
YEL
9
REAR R
VIOL/BLK
VIOL
BLK 1
FRONT R
ANT. CONT BLU
RED
3
4
2
GRY/BLK
GRY 6
7
5
ACC
GND
ANT.
CONT
ACC
16 GRNWHT 8
R152
R151
R158
0.01
C101
L9
L10
L4
52mH
P1
R62
R5 R6
6.8K
18
UNIT No.
KRC-188
RX-270
KRC-108S
MODEL NAME
0-10
0-13
KRC-108S 0-14
IC4
Q50
Q58,59
Q60,61
Q151
Q200,201
Q202,203
Q260,261
Q350,353
R353
R112
1K
R131
10K
W117
L8
4.7uH
W11
W116
C202
0.01
IC2 Q150
Q301
Q351
Q352
91K
R153
A1
REAR PRE OUT
Q450
J5
Q451
J2
D50
WH1
D261
D260
Q260
Q62
D52
D51
Q50
B.U DET SW
D351
Q350
D350 P-CON
Q351
D352
Q353
Q352
Q151
D151
D150
Q150
D200
ANT
J1
CN1
Q55
Q54
D55
Q56
Q57
8V DRIVER
P-ON 5V
Q53
Q52
Q51
D53
D54
Q153
WH1
Q261
F/E
Q371
D370
Q370
D371
A
Q200
FM+B SW
AM+B SW
Q202
Q203
Q201
CN2
D56
Q60
Q61
Q58
Q59
D13
D100
D101
D102
D103
D104
Q301
CN1
D7D8D9
D12 D11 D10
D6 D5 D4 D3 D2 D1
12
BAND ATT
VOL+VOL- CLK T.
43 AUTO 5
T.UP
AUDIO
6
SRC
EJECT
DOWN
RST
B30-1565-05D1-12 : (X13-9660-1x)
SYSTEM u-COM
POWER IC
EQ AMP
RESET IC
B.U. 5V
DRIVER
SW
8V SW
ILL+B SW
ILL+B DRIVER
ACC
DET SW
FORCED
PRE OUT
MUTE SW
MUTE SW
PREOUT
MOT+B SW
P-CON
DRIVER SW
ANT-CON
DRIVER SW
E-VOL.
MUTE LOGIC
IC E-VOL.
MUTE SW
P-CON
PROTECTION
SW
PROHIBIT SW
P-CON
PROTECTION
DISCHARGE SW
LOGIC
RESET
INVERT SW
D152
4.7K
4.7K
22K
22K
47K
10K
47K
10K
22K
22K
22K
22K
47K
22K
47K
22K
47K
10K
22K
22K
22K
22K
47K
10K
47K
22K
47K
22K
47K
47K
IC2
IC4
IC6
IC3
IC5
SYNTHESIZER UNIT (X14-6150-10)
CASSETTE MECHA
(D40-1137-05)
IC1
KRC-188(M)
DC CORD
(E30-4784-05)
(E30-4783-05)
KRC-108S(K)
DC CORD
DC CORD
RX-270(J)
(E30-4806-05)
(X13-9660-1x)
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 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.
!

KRC-108S/188
KLMNOPQRST
B LINE
ch
REP RDMSCN
ATT STEREO
T.CALL
LOUD
ATT
REP SCN RDM
ch
STEREO
0-21
YES
NO
MODEL NAME
KRC-108S
UNIT No.
0-10 NO
R120
KRC-108S
KRC-188
RX270
RX270
NO
YES NO
NO YES
0-11
0-01
0-02
YES
NO
NO
YES
YES
R121
NO
YES
YES
YES
YES
R123
YES
YES
YES
NO
NO
R370
YES
NO
NO
NO
NO YES
NO
NO
NO
NO
C450,
451
NO
NO
NO
YES
YES
D350,
351
YES
YES
YES
NO
NO
371
D370,
NO
NO 371-373
R122,
0-21
0-02
0-01
0-11
0-10
UNIT No.
X86-3160-11
X86-3200-10
X86-3160-01
X86-3160-02
X86-3160-11NO
NO
YES YES
YES
NO
NO
NO
NO YES
YES YES
YES NO
NO
W83
NO
NO
NO
NO NO
NO
Q153
370,371 L10
YES
YES
NO
NO
B38-1576-05(MILKY WHITE)
B38-1418-15(GREEN)
B30-1418-15(GREEN)
PL1.PL2
LAMP
B30-1418-15(GREEN)
B30-1418-15(GREEN)
F/E
A1
12
1
2 3
4
5 6 7 8
9
10
11
15 13
14
16 17 18
19
20
21
22 23
24
25
S9 COM2 COM1 COM3 S2 S1 S3 S5 S4 S6 S8 S7 S12 S11 S10 S14 S13 S17 S16 S15 S19 S18 S20 S22 S21
1 COM1
4S1
3 COM3 2 COM2 7S4 5 6S2
S3
8S5
9S6
18 17 16
14
13 15
11
10 12 S10
S7 S8 S9 S11 S12 S15 S13 S14
23 22
21
20
19
S18 S16 S17 S20 S19
25
24 S21
S22
95 97 96
85 86 88 90
89
87 73
74
75 77 78
79
80
81
76 82 83
84
69 70
71
72
NO
NO
NO
YES
YES
R350
NO
NO
YES
YES
YES
C202
YES
NO
NO
YES
YES
L8 116
W84,W11,117,
121
GND LINE
SIGNAL LINE
(X14-6150-xx)
A
IC1 : M38258MCD066FP
IC2 : TDA7400D
IC3 : HD74HC27FP
IC4 : TDA7384A
IC5 : LA3161
IC6 : PST9135NR
Q50,52,57,61,62
: 2SC2412K or
2SD601A
Q51,261 : 2SB1443
Q53 : 2SA1036K
Q54,58 : DTC144EK or
UN2213
Q55,59,153,352
: DTA124EK or
UN2112
Q56,60 : 2SB1655(E,F) or
2SB1565(E,F)
Q150,200,202
: DTC124EK or
UN2212
Q151,260,353,371
: DTC114YK or
UN2214
Q201,203,350,370
: 2SB1277 (Q,R)
Q301 : DTA144EK or
UN2113
Q351 : 2SA1037K
Q450,451 : DTC143TK or
UN2216
D13,100-104,150-152,352
: 1SS133
D50 : S2V20 A
D51 : MA4068(N)-M
D52,200 : MA4051(N)-M
D53,260,261,350,351,370,371
: AM01Z or
ERA15-01
D54 : MA4056(N)-M
D55 : MA4091(N)-L
D56 : MA4110-L
B38-1024-05ED1 :
ED1 (COMMON)
ED1 (SEGMENT)
AUTO
LOUD AUTO T.CALL
2SB1565
DTA124EK DTA144EK
DTC114YK DTC124EK
DTC143TK DTC144EK
2SA1036K 2SC2412K
2SB1277
2SB1443
2SA1037K
LA3161