KRC-15R,179R,25R,279R,281R
2
CONTENTS / BLOCK DIAGRAM
CONTENTS / BLOCK DIAGRAM ...............................2
COMPONENT DESCRIPTION...................................3
MICROCOMPUTER'S TERMINAL DESCRIPTION ...4
TEST MODE...............................................................6
ADJUSTMENT............................................................7
PARTS DESCRIPTIONS............................................8
PC BOARD .................................................................9
SCHEMATIC DIAGRAM...........................................13
EXPLODED VIEW ....................................................18
PARTS LIST .............................................................21
SPECIFICATIONS ......................................Back cover
CONTENTS
BLOCK DIAGRAM
IC1
KEY
P
AN 5V
MUTE
B.U. DET
.
B.U.
ACC
P-CONT
.
MUTE
PRE
POWER IC
EQ. AMP
.
CH ISO
AMP
NC/MPX/
E-VOL.
CD/MD
CHANGER
FRONT
Lch
FRONT
Rch
REAR Lch
REAR Rch
J2
LCD DRIVER
LCD
ME1
MAIN
CASSETTE MECHA.
IC5
1 Lch
2 Rch
PRE OUT
IC2
IC4
IC3
SP
OUT
REAR
J4
P
AN IN SW
ACC DET
.
P-CONT
.
J2
J5
IC1
FRONT
-END
J1
FM+B
Q201
AM+B
Q203
AM BPF
FM BPF
C154,R206
C153,R207
Q320
Q450,451
Q49
Q50
Q350,351,370
Q53
SW 5V
Q54-57
8V
Q58-61
ILLUMI.
B.U. 5V
Q51,52
SYSTEM u-COM
S1
S2
S3
RST
SW
Q301
D1-15
PL1,2
ANT
.
TEL
MUTE
DECODER
RDS
IC7
40W
RST
IC
RST
IC6
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
P
.ON
ACC DET
B.U. DET
SCL
MUTE
SDA
P
CON
PANEL
RESET
L CLK
L D
ATA S
L D
ATA L
FWD/REV
MOTOR
CH CON
DATA
H
DATA
C
REQ H
REQ C
CH CLK
Rch
COM
Lch
MP
IN
AM
MPX
OUT
RR
OUT
LR
OUT
RF
Rch
LEVEL
SCL
SDA
OUT
LF
Rch
STBY
MUTE
Rch
Lch
T
-MUTE
FWD
REV
B.U.5V
8V
B.U.
CH RST
S MUTE
8
5
10
B.U.5V
AM+B
VDD 5V
PACK IN
L RES
PHONE
CH MUTE
BEEP
SVR
AMP
. STBY
SVR
AC GND (BEEP)
Lch
Lch
Rch
Lch
1200mV
T
APE :1681mV
CD/MD-CH :3529mV
AM :772mV
FM :1339mV
8V
RF GND
OSC GND
IF2 +B
AUDIO OUT
8V
S-METER
SD
PLL-SCL
PLL-SDA
M1
HD1
L/R
55.6mV
B.U.5V
SW5V
8V
B.U.5V
AM: 170mV
FM: 213mV
T
APE
P
ACK IN
(FF/REW)
AMP
. MUTE
FF/REW
B.U.5V
R QUAL
R CLK
R DA
T
A
SW5V
MP
OUT
QUAL
AFC
NOISE
B.U.5V
ILLUMI.
L CE
(X13)
M
KRC-15R,179R,25R,279R,281R (E,M)
A1
TEL
DET
D380
5V
R205
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