Kenwood KRC-225 Service Manual page 12

F G
F1 (10A)
SYNTHESIZER UNIT (X14-6850-XX)
13 12 11 10 9
5 4 3 2 1 ∗
IC4
POWER IC
R50
D50
3.3K
0V
1/2W
C50
3300u16
14.4V
BU BU
+
BU BU
∗
B BACK-UP DETECTION
(MOMENTARY POWER
DOWN DETECTION)
D52
SW
C52 R54 R52
R371 D51
0.01 10K 33K
1K
Q370
1/2W R57 Q50
43K
R373 R372
1K 22K
61 62
1/2W
Q51,52
40
BACK-UP
C53
5V AVR
C159
100u16
100u10
+
∗
R58 +
C D54
22K
C160
10u16
C54
Q51 +
0.01
Q350
Q350
P-CON.
C350
DRIVER
C55
3.3u25 Q52
10u10
+
+ Q151
Q351 C56
100u6.3
C351
+
Q53
0.068
P.ON
47K
5V AVR
41
Q352
10K
Q351
C352
D352
0.1u50 P-CON.
Q151
PROTECTION SW
+
SVR DISCHARGE SW
Q352
+5V
P-CON.
PROTECTION
INHIBIT SW
1
BU
P5V
+5V +5V
44
R127
C101
47K
0.01
R126
47K
41
5V
SW5V
0V
42
5V
ILL
0V
43
5V
5V
0V
0V 44
BEEP 5V
0V
45 5V
0V
46 5V
5V 0V
47 0V
48 5V
0V
ROLL OFF
49
NOISE CANCELLER
50
SEL1
51
SEL2 0V or 5.0V
5V
52
IC1
SEL3 0V
53
SYSTEM MI-COM
EQ MUTE
5V
54
5V
0V
FWD/REV 0V
55
PLL CLK
R103
2.2M 56
PLL DATA
REMO
57
58
R129 22K
59
D100 4V
60
5V
0V
61 0V
5V
61 ACC DET
62 5V 0V L DATA S
5V
62 B.U. DET
0V 0V
L DATA L
R138 63
S METER
22K
64
PANEL
4V
0V 0V
0V
+5V
H I
BU
+
R156
180K
5V
0V
+
TH1 D151
+5V
IC3
1 14
5.0V
VDD
5V
13
0V
2
IC3
5V
0V
MUTE
3
LOGIC
4
12
11
5
10
6
9
5V
0V
5V
0V
Q153
R160 47K
7
8
GND
Q153
PRE OUT
R159 100K C163 0.01
MUTE DRIVER
0V
BU BU
P5V
R125
5.0V 47K
+5V
2
+B
24
23
22
Q320
21
PANEL 5V
20
SW
5.0V
19
R321 R320
18
27K 47K
17
16
SCL
Q320
15
MOTOR 5.0V
14
13
CH CLK 13
12
12
DATA H
11
DATA C 11
10 R116 4.7K
C320
SD 10
R119 2.2K 47u6.3
9
9
+
R118 2.2K
8
8
R114 22K
R105
7 1K
7
SDA
R131 10K
6
L CE 6
5
L CLK 5 11 9 7 5 3
4
4 12 10 8 6 4
J3
3
3
2 0V
GND
C102
1
XIN
22P
C103
22P
(X14-6850-XX)
MODEL NAME UNIT NO. A B
KRC-235 0-10 YES NO
KRC-265 0-21 YES YES
KRC-225 0-11 NO NO
KRC-265S 0-21 YES YES
J K
REAR PREOUT
J5
C452
0.01
R452 R453
30K 30K
Q450 Q451
PRE OUT
MUTE SW
(Lch)
PRE OUT
MUTE SW
(Rch)
+ +
L3 4.7uH
+B
Q150
C150
47u10
+
C151
0.01
IC2
0V
8.2V
5V
3.4V 0V
5V
0V
IC2
E-VOL. &
N.C. MPX
14.4V
C157
BU
150P
C156
0.033
R65
2.2 1/2W
14.2V 8.2V
BU +B
Q56
R66
2.2 1/2W
COM+B
AVR Q57
Q55 R63 R64
1K 1K
Q54
Q54,55
47K
COM
+
+B SW
47K
IC5
EQUALIZER
AMPLIFIER
1
2 P1
C D IC4 R120 R121 R122 R123 W104
YES TDA7384A NO YES NO YES NO
NO TDA7386 NO YES YES YES
NO
YES TDA7384A YES NO NO YES NO
NO TDA7386 NO YES YES NO YES
L M
L4
52mH
8.2V
+B
J1
FM+B
SW
Q201
FRONT-END
A1
AM+B
SW
R203
1
22K
RF GND
2
FM+B SW FM ANT
22K
Q203
26
3
C200 AM ANT
22K
AM+B 0.01
4
Q200 OSC GND
SW
8.2V 5
Q202 +B FM+B
8.2V 6
+B AM+B
22K
25
7
OSC GND
8
22K
OSC GND
9
OSC GND
10
OSC GND
11
VT
8.2V 12
+B +B PLL+B
13
IFC OUT
14
8 SDA
15
Q150 9 SCL
D200
16
ELECTRIC DIG GND
VOLUME
L8 4.7uH 5.1V
17
MUTE SW
+B VDD 5V
C206 47u10 18
IF2 GND
+
8.2V 19
+B +B IF2+B
20
AUDIO OUT
21
10 SD
22
63 S-METER
8.2V
23
IF1+B
+B
24
IF1 GND
54
CME1 (D40-1136-05)
S3 S2
CN1
FWD
C251 R251 Ref.99
0.047 10K FWD/REV
1 1
GND
2 2
REV
+ HEAD R
3 3
Rch
M1
HEAD
+
COM
M
4 HD1
4
S1
C3
47u6.3 HEAD L
Lch
5 5
C6
100P
KRC-225/235/265/265S (1/2)
KRC-225/235/265/265S
N O
CAUTION: For continued safety,
replace safety critical components only
with manufacturer's recommended
parts (refer to parts list). indicates
safety critical components. For contin-
ued protection against risk of fire,
replace only with same type and rating
fuse(s). To reduce the risk of electric
shock, leakage-current or resistance
measurements shall be carried out
(exposed parts are acceptably insulat-
ed from the supply circuit) before the
appliance is returned to the customer.
Manufacture under license from Dolby
Laboratories.
"Dolby" and the double-D symbol are
trademarks of Dolby Laboratories.
6 T.MUTE 6
5 GND 5
4 MOT GND 4
3 MOT+B 3
2 PACK IN 2
1 GND 1
X16-
J1
2/2
A