Kenwood KAC-X542 Service Manual page 16

U
KAC-X542
1
CAUTION : For continued
safety, replace safety criti-
cal components only with
manufacturer's recom-
mended parts (refer to parts
list).
Indicates safety critical
components. To reduce the
risk of electric shock, leak-
age-current or resistance
measurements shall be car-
ried out (exposed parts are
acceptably insulated from
2
the supply circuit) before the
appliance is returned to the
customer.
• DC voltages are as mea-
sured with a high imped-
ance voltmeter. Values
may vary slightly due to
variations between indi-
vidual instruments or/
and units.
CN1
30
3
LOGO-LED 29
-15V 28
SW5V 27
+15V 26
ILL+B 25
FAN+B 24
ILL-GND 23
AMP-BL 22
GND 21
X09-
CN4
1/2
AMP-BR 20
ISO-GND 19
4
A
AMP-AR 18
GND 17
AMP-AL 16
ISO-GND 15
DGND 14
DO 13
CE 12
CL 11
DI 10
ISO-BL 9
8
ISO-BR 7
ISO-AR 6
5
ISO-AL 4
5 MUTE-BMS 3
SDA-BMS 2
SCL-BMS 1
FAN
CN2
FAN+B 2
DGND 1
WH2
FAN+B
LOGO-LED
DGND
6
CN2
FAN+B 2
FAN
DGND 1
(X09-578x-xx)
MODEL
NAME
KAC-PS541
KAC-X541
KAC-X542
7
16
X08-4160-11 (1/2), X09-5780-11 B/2 (1/1)
V
PREAMPLIFIER UNIT (X08-416x-xx)
TP26
TP25
TP24
TP23
TP22
TP21
TP20
TP19
TP152
TP18
TP9
TP17
TP16
TP15
TP14
TP13
61
TP12
62
TP11
63
TP10
64
TP8
TP5
TP6
TP7
TP4
3
TP3
2
TP2
1
TP1
1
2
3
AUDIO UNIT
(X09-578x-xx) (B/2)
CN1
1 FAN+B
LOGO-
2
LED
3 DGND
D79 : 1SS355
∗
D92 :
UNIT
D92
No.
0-10 B30-1601-05
0-11 B30-1743-05
W
R122
TP31
8.2K
TP29 TP33
∗ C105
C101
C103 0.22
+
0.1
TP35
S1
7 8
TP30
∗ C106
C102 C104 0.22
+
0.1
ACH TP34
TP28
ST/MONO
R104
8.2K
TP40
TP27
TP51
R5
22K
TP53
C3 C5
0.22 0.22
BCH
ST/MONO
C6
C4 0.22
0.22
TP55
S3
7 8
R6 22K
TP49
TP47
S9 S7
S8
TP139
ENT
49
KS6
50
TP140 KI1
R206 1K 51
KI2
TP142
R211
5.0V
TP153 TP155
1K
52
KI3
53
KI4
54
KI5
55
TEST
56
VDD
C202
3.5V
0.047
TP143 57
VDD1
C203
1.7V
0.047
TP144 58
VDD2
59
VSS
C204
820P
TP145 60
OSC
R201
68K
R202 470
TP146 61
61 DO
R203 470
TP147 62
62 DE
R204 470
TP148 63
63 CL
R205 470
TP149 64
64 DI
X
TP32
IC1(1/4)
∗
2
TP36
C107
1
TP37
3
+
R105
S2
56K
7 8
10K(A)
VR4
50K(C)
TP46
HPF,12dB/oct,
F=VRcont
IC1(2/4)
∗
5 4
C108
7
6
+
TP42
15.0V
TP41
TP52
R237
TP54 TP156
39K
IC2(4/4)
IC2(1/4)
TP158
13
2 14
C7 C61
1 12
3
0.22 0.22
ISF,
15Hz24Db/oct
IC2(2/4)
IC2
C8 C62
5 4 (3/4)
0.22 0.22
7 10
6
8
9
TP159
11
R238 39K
15.0V -15.0V
TP56 TP57 TP161
TP150
TP151
TP113
S30
S29
5.0V
S28
S27
S26
IC7
S25
LCD DRIVER
S24
S23
S20
S19
S18
S17
5.0V
Y
R233
TP174 TP170
100
VR5
TP38
INPOUT SENS.
R
1
TP43
ON/OFF
TP157
∗
TP8
C63
+
S4
7 8
∗
TP58
C64
+
TP160
32
S32
31
S31
30
29
28
27
26
25 TP118
S21
24 TP119
S20
23 TP120
S19
22 TP121
S22 S18
21 TP122
S21 S17
20 TP123
S16
19 TP124
S15
18 TP125
S14
17 TP126
S13