Kenwood KRC-208S/218, Service Manual

Page: 10 / 19

1.3V 0.8V 3.5V 0V 8.2V 3.5V 0.8V 1.3V
4.0V 4.0V 4.0V 4.0V 4.0V 4.0V
4.0V 4.0V 4.0V 4.0V 4.8V
4.0V
0V
5V
0V
5V
0V
8.2V
3.4V
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
OSC GND
FM+B
1
2
RF GND
10u16
C450
+
270
R450
10u16
C451
R451
R454 100
R452
30K
2 Lch
R453
30K
R455 100
+
270
1 Rch
0.01
22 23 24 25
0.01
C151
47u10
C150
+
L3 4.7uH
0.1
C506
4.7K
R150
0.1
C155
0.015
C153
0.22
C154
0.033
150P
C157
C156
7 5 6
0.22 0.22
1u50 C152
+
23
IF1 GND
IF2 GND
0.01
C200
0.01
C201
22K
R203
22K
R201
1K
R202
1K
R200
R205
150
9
8
L9 4.7uH
63
10
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
+
R62
100u10
C58
+
1K
R64
1K
R63
R65
2.2 1/2W
R66
2.2 1/2W
4.7K 2.7K
R207 R206
3 4
+
0.022
3
C7
120K
R7
100u10
100
+
100P
C5
C9
R5 6.8K
R3
L I
N
8
L N
F
L
OUT
7 6
C3
47u6.3
4
10
R250 120K
R8
C250
100u10
R6 6.8K
+
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
16
7
25
26
0-12
0-21
NO YES NO
NO YES YES
MODEL NAME
KRC-208S (K)
UNIT NO.
0-10
NO YES NO
R122 R120
KRC-288 (M)
KRC-218 (K)
KRC-268 (M)
KRC-28MR (K)
YES
YES
YES
R121
YES
NO
R123
YES
28 27 26 25 24 23 22 21 20 19 18 17 16 15
AC OUT
L
AC OUT
R
CREF
OUT
LF
OUT
RF
OUT
LR
OUT
RR
VDD GND SDA
SCL
S MUTE
MUX R MUX L
1
2 3 4 5 6 7 8 9
10
11
12 13 14
AC IN L AC IN R T
APE R
T
APE L
CDR CDRG CDL CDLG PHONE AM MPX LEVEL
1
MP
IN
MP
OUT
54
C13 C14
L4
52mH
C452
NO
YES
NO
YES
NO
YES
NO NO YES YES NO 0-11 NO YES
YES NO YES NO YES
0-22
NO NO LC72366-9592 YES NO
NO YES LC72366-9593
IC1
NO NO
NO YES
LC72366-9592
LC72366-9592
W104
NO NO
CN2
LC72366-9592
T.MUTE
GND
MOT GND
MOT+B
GND
PACK IN
Lch
1
2
FWD
REV
Rch
Ref.99
6
3
4
5
10K
Q54,55
IC2
Q150
A1
REAR PREOUT
Q450
J5
Q451
Q150
Q201
D200
Q203
FM+B SW
ANT
J1
CN1
Q55
Q54
D55
Q56
Q57
+B SW
(X14-614x-xxx)
A
COM
B C D
Q200
Q202
J1
X13-
2/2
HD1
S3
M
M1
S1
S2
COM+B
AVR
EQUALIZER
AMPLIFIER
ELECTRIC
VOLUME
MUTE
PRE
SW
FM+B
DRIVER
AM+B
DRIVER
AM+B
SW
FRONT-END
E-VOLUME
MUTE SW
4.7K 4.7K
22K
22K
47K
22K
47K
22K
22K
22K
22K
22K
IC5
KRC-208S/218,268/288,28MR (K/K,M/M,K) (1/2)
IC2
A
ME1 (D40-1136-05)
KRC-208S/218,268/288,28MR
K M O L N
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