Service manual

QT-CD121
– 13 –
78 9101112
Figure 13 SCHEMATIC DIAGRAM (4/4)
11.83V
0V
8V
<3V>
<0.7V>
<0.1V>
1
1
5
5
HEADPHONES PWB-A4
2
3
1
8
4
5
7
6
R233
4.7K
R234
4.7K
C201
0.0056(ML)
C202
0.0056(ML)
R201
100K
R202
100K
IC201-2
KIA4558S
SURROUND
AMP.
IC201-1
KIA4558S
SURROUND
AMP.
SW102-G
C354 0.0056 (ML)
CNP201
CNS201
SW202-A
SW202
SURROUND
SW202-B
1N4148
D309
1N4148
D308
C302
0.022
C301
0.022
IC203
KIA7808P
VOLTAGE REGULATOR
VR201-A 20K (B)
VR201-B
20K(B)
C218
0.0027
R220
3.3K
C217
0.0027
R219
3.3K
C211 47/16
R212 10K
R211 10K
C208
4.7/50
C212
100/10
C209
4.7/50
C203
10/16
C204
10/16
C210
4.7/50
C352
220/10
Q351
S8050D

R354
10
47K
R353
C353
0.022
(ML)
R351
330
150
R352
C221
0.0015
C223
100/10
C229
100/10
C233
1000/10
FW202
C227
3300/25
C226
0.022
D201
1N4148
IC202
LA4597
POWER AMP.
C222
0.0015
C225
220/25
C224
100/10
R215
2.2K
R231
330
R207 12K
R208 12K
R216
2.2K
R217
22K
R218
22K
C213
0.039
(ML)
C214
0.039
(ML)
C230
100/10
SW201-D
C234
1000/10
C232
0.1
(ML)
C231
0.1
(ML)
SW201-C
SP502
SP501
M601
SW601
R230
2.7
C654
0.022
C651
0.022
D651
1N4004
D652
1N4004
C652
0.022
C653 0.022
D654
1N4004
D653
1N4004
T601
POWER TRANSFOMER
SO651
CNP602
CNS602
R222
1K
R221
1K
R227 120
C219
0.047
(ML)
C220
0.047
(ML)
C216
0.039(ML)
C215
0.039
(ML)
3
2
1
1
2
3
4
5
6
7
8
9
10
11
12
13
M
1
2
3
1
2
3
1
2
2

R228 120
J201
HEADPHONES
R213 22K
R214 22K
R205
4.7K
C205
0.0018
C206
0.0018
R204
10K
R203
10K
R209
22K
C207
4.7/50
R210
22K
R206
4.7K
+B
+B
+B
BATTERYS
DC12V["D"size(UM/SUM-1,
R20 or HP2)battery x 8]
+B
+B
+B
+B
R-CH
L-CH
SPEAKERS
–
–
+
+
VOLUME
(241-7)
MAIN
(241-6)
TAPE
MOTOR
TERMINAL PWB-A3
X-BASS
R
P
TAPE
AM
FM AUTO
CD
CD
FM AUTO
AM
TAPE
–
+
OUT
IN
V
CO
k
Hz
AC INPUT
MAIN PWB-A1(1/2)
RECORD SIGNAL
PLAYBACK SIGNAL
CD SIGNAL
FM SIGNAL
AM SIGNAL
1
9
8
7
6
5
4
3
2
1
12
11
10
PIN
NO.
VOLTAGE
IC2
1.6V
1.6V
6V (6.3V)
0.2V (0.7V)
1.6V
0V
0V
0V
2.5V
2.5V
5.1V (6.6V)
0.8V (1V)
21
20
19
18
17
16
15
14
13
24
23
22
PIN
NO.
VOLTAGE
1.2V (0V)
1.9V (1.6V)
1V (1.3V)
1.7V
1.5V (1.7V)
1.5V (1.5V)
0.4V (0.4V)
6.1V (6.4V)
6.1V (6.4V)
1.6V
1.6V
1.6V
( ): AM
< >: Recording
[ ]: Play
9
8
7
6
5
4
3
2
1
12
11
10
PIN
NO.
VOLTAGE
IC101
<0V> [3.23V]
<0V> [0V]
<0.6V> [0.6V]
<0V> [0V]
<0V> [0V]
<0V> [0V]
<0V> [0V]
<7.43V> [7.43V]
<0V> [0V]
<7.37V> [7.37V]
<0.6V> [0.6V]
<3.3V> [3.3V]
9
8
7
6
5
4
3
2
1
13
12
11
10
PIN
NO.
VOLTAGE
IC202
0.1V
0V
11.2V
0V
11.3V
0V
0.1V
12V
10.4V
5.8V
0V
5.8V
10.4V