© 2003-10 PRINTED IN JAPAN
B53-0096-00 (N) 1689
CASSETTE RECEIVER
KRC-108S/165/189
(REVISED)(X14-943/936)
SERVICE MANUAL
· This service manual It is only for X14-943/936.
· X14 Except Please refer to the following service manual.
KRC-108S : B51-7576-00
KRC-165
: B51-7855-00
KRC-189
: B51-7674-00
S/No. 30900001
~
1781mV
546mV
1681mV
:
:
:
FM
AM
TAPE
400mV
170mV
:
:
FM
AM
55.6mV
CASSETTE MECHA
(X14-943/936)
(X13-966 : KRC108S/189)
(X16-150 : KRC-165)
EXCEPT KRC-108S
KRC-108S/189/165
FM+B
AM+B
5V
Q202,203
Q200,201
A1
IC1
ED1
7SEG LED
RST IC
IC6
MOTOR SW
Q260,261
SYSTEM u-COM
Q53
SW5V
8V
Q54-57
LAMP
BU5V
Q51,52
P.CONT.
B.U DET
ACC DET.
Q350-354
Q50
Q62
ANT-CONT
Q355,370,371
J2
Q58-61,63
ILLUMI
8V
BU5V
IC5
EQ. AMP
KEY
RST SW
LED
RST
Q301
FM BFP
AM
IC2
MUTE
Q150,
IC3
J2
IC4,Q151
SP OUT
POWER
IC
E-VOL.
N.C.MPX
AMP
M
PACK
MAIN
FWD
REV
IN
T-MUTE
(FF/REW)
PLAY
HEAD
153
2
J5
1
Q450,451
PRE
MUTE
Rch
Lch
REAR
PRE OUT
RF GND
FM ANT
RF GND
AM ANT
FM +B
OSC GND
OSC GND
OSC GND
OSC GND
AM +B
PLL +B
SDA
SCL
IFC OUT
VT
DIG GND
S-METER
IF1 GND
IF1 +B
SD
AUDIO OUT
IF2 GND
IF2 +B
VDD 5V
FM+B
AM+B
TUN SDA
TUN SCL
TUN SMETER
SD
8V
FF/REW
PA
CK
IN
FWD/REV
M
OTO
R
KS0-KS4
KI0-KI3
SEG1-SEG22
COM1-COM3
RESET
22
3
SCL
SDA
AMP.STBY
BEEP
SVR
AMP.MUTE
ACC DET
B.U DET
MUTE
ANT CON
P CON
ILL
PON
B.U
ACC
ANT-CONT
P-CONT.
BU5V
BU5V
Lch
COM
Rch
L
TAPE
R
4
5
BU5V
8V
B.U
MP IN
LEVEL
MPX
AM
SCL
SDA
Rch
Lch
BU5V
FRONT Lch
FRONT Rch
REAR Lch
REAR Rch
OUT LF
STBY
SVR
MUTE
AC
OUT RF
OUT LR
OUT RR
L
COM
R
SMUTE
B.U
8V
BLOCK DIAGRAM
KRC-108S/165/189 (REVISED)
2
SYNTHESIZER UNIT (X14-943/936)
Ref. No.
Application/Function
Operation/Condition/Compatibility
IC1
System
µ-com
System control
IC2
Electronic volume
Controls on volume and selection of various sources
IC3
Logic IC for muting
Mute control
IC4
POWER IC
Amplifier for speaker output
IC5
EQ AMP
Equalizer amp for the cassette player
IC6
RESET IC
IC for Power ON Reset
Q50
BU DET SW
"H" output when backup voltage is 9.2V or less
Q51,Q52
BU 5V Driver
Turned on when backup is turned ON.
Q53
P-ON5V SW
On while power is turned ON. (Except ALL-OFF)
Q54,Q55
8V SW
On while power is turned ON. (Except ALL-OFF)
Q56,Q57
8V Driver
On while power is turned ON. (Except ALL-OFF)
Q58,Q59
ILL+B SW
On while power is turned ON.
Q60,Q61
ILL+B Driver
On while power is turned ON.
Q62
ACC DET SW
"H" output when ACC is OFF.
Q63
ILL+B error prevention SW
Turned ON with "H" after
µ-com port is set.
Q150
Electronic volume MUTE SW
IC2 is muted when Back Up is detected or Reset and
µ-com mute is detected.
Q151
SVR forced discharge SW
When P-MUTE is ON (conditional), SVR discharge.
Q153,Q450,Q451
Pre Out MUTE SW
Pre Out is muted when back up is detected or Reset and
µ-com MUTE are detected.
Q200,Q201
FM+B SW
On in FM MODE
Q202,Q203
AM+B SW
On in AM MODE
Q260,Q261
MOT+B SW
On in TAPE MODE
Q301
RESET logic reverse SW
"H" output when RESET SW is ON.
Q350,Q353
P-CON Driver SW
Off when Power OFF and ALL OFF.
Q351
P-CON protection SW
On when P-CON shorts with GND.
Q352
P-CON protection prohibited SW
Protection switch is prohibited only at the moment when P-CON is turned ON.
Q354
P-CON error prevention SW
Turned ON with "H" after
µ-com port is set.
Q355
ANT-CON error prevention SW
Turned ON with "H" after
µ-com port is set.
Q370,Q371
ANT-CON Driver SW
When tuner is ON.
COMPONENTS DESCRIPTION
MICROCOMPUTER'S TERMINAL DESCRIPTION
Pin No.
Pin Name
I/O
Application
Truth Value
Processing Operation Description
Table
1NC
-
2
VL1
I
Power source input for LCD
3~5
KI0~KI2
I
Key return input
6~9
KS0~KS3
O
Key scan output
10
TUN_SMETER
I
S-meter detection terminal
11
KS4
O
Key scan output
12
BEEP
O
Beep output
13
NC
O
Not used
14
MOTOR
O
Mechanism motor ON/OFF
H : Mechanism motor ON
15
FF/REW
I
Mechanism FF/RWD detection
L : FF/RWD detected for MUTE
16
PACKIN
I
Mechanism PACK-IN detected
TAPE IN : L, NO TAPE : H
17
KI3
I
Key return input
18
FWD/REV
I
Detection for mechanism playing direction
H : FWD, L : REV
19~25
NC
O
Not used
SYSTEM MICROCOMPUTER : M37560MFD904FP (X14 : IC1)
KRC-108S/165/189 (REVISED)
3
MICROCOMPUTER'S TERMINAL DESCRIPTION
Pin No.
Pin Name
I/O
Application
Truth Value
Processing Operation Description
Table
26
SD
I
Station detected
H : Station detected
27
TUN_SCL
O
Clock output for F/E
28
TUN_SDA
I/O
Data input/output for F/E
29
IFC
O
Not used
30
AM+B
O
Power output for AM
H : AM+B ON
31
FM+B
O
Power output for FM
H : FM+B ON
32
SCK
O
Clock output for IC2
33
SDA
I/O
Data input/output for IC2
34
NC
O
Not used
35
RESET
I
Reset input
Normal : H, RST : L
36
NC
O
Not used
Not used (but Pull down at 10K)
37
NC
O
Not used
38
XIN
-
Clock input
8.000MHz (L77-2032-05)
39
XOUT
-
Clock output
40
Vss
-
Power input (0V)
41
IC2TYPE1
I
IC2 setting switching
42
IC2TYPE2
I
IC2 setting switching
43
NC
O
Not used
44,45
SEL1, SEL2
I
Destination switching
q
46
MUTE
O
Mute ON/OFF
H : MUTE ON
47
STBY
O
POWER IC standby control
POWER IC ON : H, OFF : L
48
SVR
O
POWER IC SVR control
When reduction inpower is detected : H, Normal : L
49
ACCDET
I
ACC detection
ACC detected : L, ACC not detected : H
50
BUDET
I
Instantaneous reduction
BU detected : L, BU not detected (Instant reduction) : H
51
PNCMUTE
O
Power IC mute
L : MUTE ON, POWER OFF and ALL OFF : L
52
ANTCON
O
External antenna control
H : ANTCON ON
53
PNCCON
O
Power control output
H : P-CON ON
54
ILLCON
O
Illumination control
H : Backlight ON
55
PORT ON/OFF
O
Port control
For error prevention when
µ-com is unstable. Output : L
56
SW5
O
5V-system power source control
L : ON, HI-Z : OFF (H during instantaneous reduction, L when
power consumption is low other than instantaneous reduction.
57
EQNCMUTE
O
Not used
58~68
NC
O
Not used
69~90
SEG22~SEG1
O
LCD segment output
91
Vcc
-
Power input (5V)
92
VREF
-
A/D standard voltage input
93
Avss
-
Analog power input (Vss)
GND connection
94
NC
-
Not used
95~97
COM3~COM1
O
LCD common output
98,99
VL3,VL2
I
LCD power input
100
C2
-
Not used
Truth Value Table q
Destination
SEL1
SEL2
KRC-108S
L
L
KRC-165/189
L
H
RX-290
H
X
X : Not applicable (PULL DOWN in effect)
KRC-108S/165/189 (REVISED)
4
A
B
C
D
E
1
2
3
4
5
6
7
R370
R350
W75
C350
W51
W46
W19
1
W41
R300
R302
R303
R301
W33
R110
W23
W38
W44
W43
W18
W17
C152
W
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
5
1
C4
R111
W78
B
E
W74
C58
R67
C57
B
C15
C
17
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
D352
P1
D1
D10
D1
D1
D13
D152
D150
CN1
D52
D351
Q350
D54
D51
D350
IC5
D55
Q51
D53
D56
SYNTHESIZER UNIT X14-9430/9360-xx (J74-1617-02)
IC4
D371
D370
J2
D50
J2
Q60
Q56
W106
R151
W118
BE
B
R102
R101
W120
C101
R103
R113
R109
R108
R107
R112
W88
R117
100
1
C60
B E
C164
C14
R115
5
4
C104
R114
R129
R128
W87
R114
R118
R130
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
R132
R133
R124
R126
R57
C52
R352
B
BE
C351
W114
E
R52
B
E
EB
R54
C54
R58
C6
R8
R250
C8
R6
R4
C2
R2
C1
R1
C251
R251
W115
E
B
BE
R60
R61
BE
E
B
E
BE
BE
B
EB
R63
R62
R64
BE
W
W1
W112
W111
R152
W110
R13
R16
R153
W121
W113
W109
TH1
C601
C600
R14
R15
B
E
BE
Q151
Q301
Q371
IC6
Q351
IC1
Q63
Q354
Q355
ED1
Q50
Q352
Q353
Q62
Q59
Q58
Q53
Q54
Q52
Q61
Q55
Q57
PC BOARD (FOIL SIDE VIEW)
KRC-108S/165/189 (REVISED)
5
J
I
H
G
F
1
2
3
4
5
6
7
12
1
R261
R307
W1
B
E
L9
24
C206
L8/W11
L10/W84
1
W13
R104
W10
W21
W4
R105
R106
R260
1
W15
W16
W19
300
302
303
R110
W18
W17
C152
6
W9
W7
W5
W2
W14
W12
R202
B
E
E
B
R200
W6
W20
W22
L5/W200
L4
C15
1
2
W8
C450
C451
C17
C18
C16
Q203
Q261
A1
CN2
P1
D100
D261
D260
D103
D102
D101
WH1
D104
D200
D13
J1
Q201
J5
W106
R205
C210
W117
C202
W101
C200
C201
EB
3
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
5
1
28
1
R454
R451
R450
C452
R452
R455
BE
R453
BE
EB
W102
W105
W104
W103
Q260
Q301
Q202
IC3
Q200
Q150
IC2
C6
Q153
Q450
Q451
Refer to the schematic diagram for the values of resistors and capacitors.
X14-9430/9360-xx
IC
Q
Address
16D
24F
34F
42D
55B
64E
50
4C
51
4C
52
4B
53
4B
54
4C
55
3C
56
2B
57
3B
58
4B
59
4B
60
3B
61
3B
62
4C
63
6C
150
4F
151
3E
153
3G
200
4G
201
3G
202
4G
203
3G
260
5F
261
5G
301
5F
350
3D
351
4D
352
4D
353
4D
354
6C
355
6C
370
3D
371
4D
450
3F
451
2F