Kenwood KAC-PS621 Service Manual page 14

K
KAC-PS621/X621
DC/DC CONVERTER
1
2
3
Q59 Q57
4
5
6
7
8
Q60 Q58
1
2
3
4
5
6
7
8
5V SW 5V AVR
Q69
Q66
5.0V
R80
T.
Q149
47K
148 Q68
Q50
52
TRANS.
X1
12.288MHz
P4
P5
P6
A/D
S
EQS
EF1
AL
AA
K
IC6
ATAM
u-COM
ATAS
LK
U
5
AMP
7
AMP
O
O
R423
39
14
X09-5770-10 A/2 (3/3)
L
Q51
R59
10
Q55 Q601
Q53
Q56 Q602
R60
Q54
10
Q52
W256
W255
14.4V
Q64
D59
14.2V
R74 R71
100K 10K
Q71
Q65
10K
10K
IC7 RST
3 2
NC VDD
4
VSS
1
VOUT
C403
2.2u50
+
S1
60
RESET
59
FAN2
58
FAN1
57
MUTE2
56
MUTE1
55
SW5V 55
54
POWERON 54
53
ABCUR
52
DCDET
51
DPWER
R401
50
5.0V DCUR
49
10K
NC49
48
NC48
47
NC47
46
COMMSW
45
NC45
44
NC44
43
ATT3
42
ATT2
41
ATT1
10K
Q403 Q404
M
IC2
16
5.0V
1
IN2+
IN1+
15
2
IN2-
IN1-
14
3
REF
FBACK
13
OUTCTRL
4
DTC 0.5V 5.0V
C53
1000P C52
5
14.2V
CT
12 47u25
VCC
R54 6
+
11
RT 0V
C2
18K
7 10
GND E2
14.2V 8 9
C1 E1
Q91
Q92
D81
2 1 1
W252
L1 1 2 2
25uH
1
W251
D70 2
Q70
D71
BATT
GND
P-CON
Lch+
R201 C145
10 0.047
Lch-
1/2W
Rch-
5.0V
R202 C146
10 0.047 Rch+
1/2W
60
59
58
57
56
53
ID NUMBER
S2
3 1
KAC-PS621/X621 (1/2)
N
2SA965-F DTA114EUA
2SA992-A DTA124EUA
2SC1845-A DTC114EUA
2SC2235-F
B
C
E
NJM4565MD-ZB
2SA1576A
2SC3419
CN61
DA204U
CN9
J2
B
E C
2SK246
7
2SC4081
6
5
4
3
2
1
NJM2058M-ZB
P1
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 measurements shall be
carried out (exposed parts are acceptably in-
sulated 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.
O
1
2
3
D
G
S
4
5
6
7