Kenwood KRC-188, KRS-108-S Service manual
CASSETTE RECEIVER
KRC-108S/188
SERVICE MANUAL
KRC-108S
Knob (EJECT)
(K27-3554-03)
Cassette lid
(A53-1675-03)
© 1999-12 PRINTED IN JAPAN
B51-7576-00 (N) 1789
Knob (REW)
(K27-3556-04)
Knob (FF)
(K27-3555-04)
KRC-108S
KRC-188
Lever
(D10-3031-04)x2
Escutcheon
(B07-2181-02)
Escutcheon
(B07-2181-02)
Knob (EJECT)
(K27-3554-03)
LCD
(B38-1024-05)
Cassette lid
(A53-1677-03)
LCD
(B38-1024-05)
Stay
(J54-0606-04)
Knob (REW)
(K27-3556-04)
Panel
(A64-1932-02)
Knob (FF)
(K27-3555-04)
KRC-188
Panel
(A64-1933-02)
Screw set
(N99-1632-05)
Mounting hardware
(J21-9491-03)
DC cord
(E30-4783-05) : KRC-108S
(E30-4784-05) : KRC-188
KRC-108S/188
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
2
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
R
55.6mV
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
3
KRC-108S/188
MICROCOMPUTER’S TERMINAL DESCRIPTION
Microcomputer (M38258MCD066FP : IC1 : X14)
•Terminal description
Pin No.
19-25 P47-41 O (NC) Not used.
36,37 P81,80 O (NC) Not used.
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
26 P40 I SD Station detection.
27 P77 O PLL_CLK IC3 clock output.
28 P76 I/O PLL_DATA IC3 data input/output.
29 P75 I IFC AM bandwidth.
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.
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.
H: Station detected.
H: Station detected.
4
KRC-108S/188
MICROCOMPUTER’S TERMINAL DESCRIPTION
Pin No.
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.
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
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.
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
5
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