Kenwood KAC-PS521, Service Manual

Page: 14 / 24

KAC-PS521/X521
14
O N M L K
1
2
3
4
5
6
7
10K
10K
10K
10K
10K
10K
10K
10K
10K
10K
3.3V
0V
3.8V
0.46V
14.2V
2.4V 0V
14.2V
14.2V
12V
0V
5V
0V
4.5V
0V 5.0V
0V 0V
5.0V 5.0V 5.0V 5.0V
0V
5.0V
5.0V
5.0V
5.0V
5.0V
5.0V
5.0V
0V
0V
0V
5.0V
5.0V
0V
0V
0V
0V
14.4V
IC2
IC6
IC8
A
KAC-PS521/X521 (1/2)
Q351
D351
Q352
Q50
D55
Q68
Q66
Q58
D54
Q56
Q57 Q55
Q71
Q65
Q64
P1
Q70
D71
D70
D51 D52
CN9
J2
Q91
Q52
Q54
Q53
Q92
D81
Q51
S2
D354
Q403
Q404
2/2
X08-
CN1
DC/DC CONVERTER
5V AVR
u-COM
ID NUMBER
E2PROM
NOT USED
C351
47u25
C69
R77
510
1u50
C74
220u16
C76
10u35
R84 1.5K
W405
W404
W403
W402
1/2W 0.047
1/2W
C146
0.047
C145
C51
W401
2
10u25
1
Rch+
Rch-
Lch-
1
2
3
Lch+
P-CON
GND
BATT
4
5
6
7
R60
10
R58
56
R61
4.7K
R62 4.7K
R59
10 R57
56
C52
47u25
R54
15K
C53
1000P
R53
6.8K
C54
14 3
OUTCTRL
GND
8
VCC
7
6
5
4
RT
CT
DTC
FBACK
E2
E1
9
C2
VCC
REF
10
11
12
13
2
1
IN1-
IN1+
47u25
IN2-
IN2+
15
16
1.5K
R56
1.5K
R55
10u35
C68
10K R71
100K
R74
4.7K
R72
10K R79
1K
R76
33K R52
10K
R351
3K
R352
1 2 3
R83 3.3K
1 2
1 2
1 2
30
LXCLK
13
R458 100
100
R460
21
2.7K
R432
2 4
5
1
3
2.7K
R433
10K
R420
10K
R427
NC15 LXB
U
NC17
AUDIOMUTE
A
UDIOSD
A
A
UDIOSCL
SCLAMP SD
AAMP
20
R455
20
100
AUDIO
21
R454 100
19
16 18 14
16 19 18 17 15 14
26
E2PSCL
DIPSW1
NC24
E2PSDA
23
22
25
24
DIPSW4
DIPSW3
MODEL1
DIPSW2
10K
R428
10K
R429
28
27
29
LCLK LXD
A
T
A
S
LXD
A
T
A
M
LD
ATA
A
R452
1K
R453 1K
9
10
11 12
11
13 12 10
9
NC47
180
R425
38
R426
180
39
36
NC32
NC31
NC35
NC34
VSS1
MODEL2
33
32
31
10K
R423
35
34
LCDILL
NC37
NC40
LED
NC36
39
38
37
100
R421
R422
100
40
42 43 44 45 46 41
A
TT2
A
TT1
COMMSW
A
TT3
NC44 NC45
52 53 47 48 49 50 51
DPWER
NC48 NC49
DCUR
DCDET ABCUR
R401
10K
47K
R431
52 53
10K
R424
100
R459
100P
C451
10u35
C358
2.7K
R443
2.7K
R444
1.8K
R442
100P
C452
100P
C453
46
6 3
2
1
A1
A0
WP
VCC
7
8
GND
4
A2
SDA
5
SCL
Lch
Rch
10
R201
10
R202
10K
R86
3.9K
R82
3.9K R85
L2
25uH
100K
R51
30A
R419 100K
R418 100K
+
+
+
+
+
+
+
+
CAUTION : For continued safety, replace safety critical
components only with manufacturer’s recommended parts
(refer to parts list).
Indicates safety critical components. To reduce the
risk of electric shock, leakage-current or resistance mea-
surements shall be carried out (exposed parts are ac-
ceptably insulated from the supply circuit) before the
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.
X09-5760-10 A/2 (3/3)
2SA965-F
2SA992
2SC1845
2SC2235-F
2SC945(A)
B
C
E
2SA1576A
2SC3419
B
E C
2SB1375-F
2SD2012-F
2SC4081
DTA114EUA
DTA124EUA
DTC114EUA
NJM4565MD-ZB
DA204U
2SK246
D
G
S
UPC494GS
NJM2058M-ZB