Kenwood KAC-PS521 Service Manual page 14

K
KAC-PS521/X521
DC/DC CONVERTER
R59
10
Q57
Q55
Q58 Q56
R60
10
Q66
D54
5V AVR
Q64
R74
100K
Q50
Q65
10K
Q68
10K
R351
Q351
10K
10K
10K Q352
5.0V 4.5V
NC40
LED
LCDILL
NC37
NC36
NC35
NC34
VSS1
NC32
NC31
IC6
MODEL2
MODEL1
u-COM
0V
DIPSW4
DIPSW3
DIPSW2
DIPSW1
NC24
5V
0V
E2PSDA
E2PSCL
AUDIO
AUDIOMUTE
R444
C453
2.7K D354
100P
R443 C358
C452
2.7K 10u35
100P
+
C451
100P
14
X09-5760-10 A/2 (3/3)
L
R51
100K
Q51
Q91
C54
47u25
+
IC2
Q53 2.4V 1
IN1+
2
IN1-
3
R53
FBACK
6.8K
0.46V 4
DTC
3.3V
C53
D81
0V
1000P
5
CT
R54
3.8V 6
RT
Q54
15K 7
12V
GND
Q92 C52
47u25
14.2V 8
VCC
Q52
+
Q71
D71
R426
Q404
180
40
R422
100
39
R421
38 0V
37
100
36
R425
35
38
34
180
Q403
33 0V
32
31
30 0V
R424
ID NUMBER
5.0V 10K
29
28
27 5.0V
26 5.0V 2
25 5.0V
24
R433
R459
2.7K
100
23 5.0V
5.0V R458 100
22
R460
21 5.0V
NOT USED
21
100
R432
2.7K IC8
5
6
7
8
5.0V
M
X08-
CN1
2/2
A
16 0V
IN2+
15
IN2-
14
REF
13
OUTCTRL
12 14.2V
VCC
11 14.2V
C2
10
E2
0V
9
E1
14.4V
J2
CN9
W401
30A
7 BATT
6 GND
5 P-CON
Lch 4 Lch+
R201
10 C145
3 Lch-
1/2W 0.047
Rch 2 Rch-
R202
10 C146
1/2W 0.047
1 Rch+
P1
1 W402 2
1 W403 2
Q70
1 2 3
W404
1 W405 2
3 S2
4
5
1
CAUTION : For continued safety, replace safety critical
components only with manufacturer's recommended parts
E2PROM
(refer to parts list).
4 0V Indicates safety critical components. To reduce the
SDA GND
3 0V risk of electric shock, leakage-current or resistance mea-
SCL A2
2 0V surements shall be carried out (exposed parts are ac-
WP A1
1 0V ceptably insulated from the supply circuit) before the
VCC A0
appliance is returned to the customer.
• DC voltages are as measured with a high impedance
voltmeter. Values may vary slightly due to variations
between individual instruments or/and units.
KAC-PS521/X521 (1/2)
N
2SA965-F DTA114EUA
2SA992 DTA124EUA
2SC1845 DTC114EUA
2SC2235-F
2SC945(A)
B
C
E
NJM4565MD-ZB
2SA1576A
2SC3419
DA204U
B
E C
2SK246
2SB1375-F
2SD2012-F
UPC494GS
2SC4081
NJM2058M-ZB
O
1
2
3
D
G
S
4
5
6
7