Service manual
QT-CD121
– 10 –
A
B
C
D
E
F
G
H
1
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34 5
6
• The numbers 1 to 12 are waveform numbers shown in page 17.
Figure 10 SCHEMATIC DIAGRAM (1/4)
2
3
1
C779
10/16
R779
47
LCD701
12345678
FW701
IC701
IX0105AW
SYSTEM
MICROCOMPUTER
R822
6.8K
IC801
LA9241M
SERVO AMP.
C835 0.1/50
C837 10/16
C838 0.01
C839 1/50
C840 0.33/50
R803
15K
R802
100K
C805
0.033
R804
2.2K
C804
0.001
R808
12K
C810
180P
R809
27K
R807
1K C809
0.047
R811
3.3K
C808
0.068
R805
6.8K
C806
0.033
C807
0.1/50
R806
100
C803
0.1/50
R833
5.6K
R835
470
C830
2P
(CH)
C833
0.001
R836
47K
C834
0.033
R832
56K
C8
3
27
P
(C
H
C822
220P
R810
82K
C82
1
1/5
0
R828
1K
R839
22K
R840
22K
C813
0.1
R812
15K
R829
1K
R814
10K
R815
47K
C812
330P
R816
1.5K
C814
0.01
R813
33K
R820
10K
R819
39K
R817
82K
C815
0.0047
R821
56K
C816
0.001
R830
1K
R824
10K
C818
1/50
C819
47/16
R825
1.2K
R826
220K
C820
0.0033
R827
220K
C817
0.47/50
R823
1.2K
C811
0.1
R709
1K
R712
1K
R710
10K
R711
2.7K
C704
100/10
C705
0.022
R713
1K
R736
1K
C702
0.022
R708
1K
R716 10K
R718 15K
R720 15K
R722 15K
R719 15K
R723 15K
R725 15K
R734
1K
R730
1K
R721 15K
R724 15K
R727
1K
R726 1K
R728 1K
R729 1K
R731 1K
R732 1K
R733 1K
X701
4MHz
R745
10K
D741
1N4148
R744
10K
C741
3.3/50
R742
1K
R743
100K
R740
4.7K
R741
3.3K
D740
1N4148
Q740
2SC1815 GR
C740
0.01
R714
10K
R715
15K
C701
0.022
R831
1K
Q805
S9012H
C849
0.022
R842
22
C848
1/50
C850
0.1
C845
4.7/50
R871
4.7K
R772
2.7K
R771
3.9K
R773
1.8K
SW772
STOP
SW771
PLAY/
REPEAT
RX771
SW774
TRACK DOWN/
REVIEW
10K
R776
R774
1.5K
SW773
TRACK UP/ CUE
SW761
CD LID
OPEN/CLOSE
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44 43
42
41 40
39
38
37 36
35 34
33
32
31
30
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
18
17
16
15
14
13121110
9
8
7
6
5
4321
1
2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
15
16
17
18
19
20 21 22
23 24
25
26
27 28
29
30 31
32
33
34
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
5354
55
56
57
5859
60
61
62
63
64
REMOTE
SENSOR
+B
+B
+B
+B
+B
4
1
1
2
4
1
RES
CQCK
CO IN
RWC
SL+
SL–
DRF
SQOUT
WRQ
PU IN
DIGITAL GND
5V
+B
+B
+B
+B
+B
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
SEG0
P00
P01
P02
P10
POWER IN
D1 MUTE
D4 COCK
D3 RES
D5 COIN
D6 RWC
D7 SL+
D8 SL–
DFR P20
SQOUT P21
WRQ P22
PU-IN P23
RESET
XIN
XOUT
VSS
VDD
XCOUT
XCIN
AVSS
VREF
P30
P31
P32
P33
P3P40
AIN5
SIMUKE AIN6
KIDSW AIN7
VLC3
VLC2
VLC1
COM3
COM2
COM1
COM0
SEG16
VCC1
LDS
LDD
BH1
PH1
LF2
VR
REFI
VCC2
FSS
DRF
CE
DAT
CL
CLK
DEF
NC
TBC
FSC
GND
SLI
SLC
RFS–
RFSM
CV+
CV–
SLOF
HFL
TES
TOFF
TGL
JP+
JP–
A GND
FE–
FE
FA–
FA
TO
JP
TE
TE–
TESI
TH
SCI
TA
TD–
TD
TB
F
E
FIN1
FIN2
FD–
FD
SPD
SP–
SPG
SP
NC
SL+
SL–
SLD
SLEQ
VREF
GND
SWITCH PWB-A2
CD SIGNAL
MAIN PWB(2/2)
9
8
7
6
5
4
3
2
1
12
11
10
PIN
NO.
VOLTAGE
IC701
0V
0V
0V
0V
0V
0V
3.9V
0V
5V
4.1V
4.1V
0V
0V
0V
0.4V
0.4V
0V
0V
0V
0V
5V
2.5V
2.5V
0V
5V
5V
0V
0V
5V
4.8V
0V
3.8V
41
40
39
38
37
36
35
34
33
44
43
42
15
14
13
47
46
45
18
17
16
50
49
48
21
20
19
53
52
51
23
22
55
54
26
25
24
58
57
56
29
28
27
61
60
59
32
31
30
64
63
62
PIN
NO.
VOLTAGE
5V
0V
0V
0V
0.4V
5V
3.1V
1.5V
2.4V
2.4V
2.4V
2.4V
2.4V
2.4V
2.4V
2.4V
2.4V
2.4V
2.4V
2.4V
2.4V
2.4V
2.4V
2.4V
2.4V
2.4V
2.4V
2.4V
2.4V
0V
0V
0V
9
8
7
6
5
4
3
2
1
12
11
10
PIN
NO.
VOLTAGE
IC801
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
0V
15
14
13
47
46
45
41
40
39
38
37
36
35
34
33
44
43
42
18
17
16
50
49
48
21
20
19
53
52
51
23
22
55
54
26
25
24
58
57
56
29
28
27
61
60
59
32
31
30
64
63
62
PIN
NO.
VOLTAGE
PIN
NO.
VOLTAGE
0V
2.5V
2.5V
0V
0V
2.4V
4.1V
4.7V
0V
0V
5V
5V
2.5V
2.5V
0.9V
0.9V
2.1V
4.2V
0V
5V
9
8
7
6
5
4
3
2
1
12
11
10
PIN
NO.
VOLTAGE
IC802
0V
0V
1.5V
0V
2V
5V
0.3V
0V
2.5V
2.5V
0V
0V
0V
5V
0V
4.8V
5V
5V
0V
0V
2.5V
0V
41
40
39
38
37
36
35
34
33
44
43
42
15
14
13
47
46
45
18
17
16
50
49
48
21
20
19
53
52
51
23
22
55
54
26
25
24
58
57
56
29
28
27
61
60
59
32
31
30
64
63
62
PIN
NO.
VOLTAGE
PIN
NO.
VOLTAGE
2V
0V
0.1V
2.2V
0V
2.5V
0V
2.5V
0V
0V
0V
4.1V
4.1V
5V
0V
2.7V
2.4V
0V
0V
0V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.2V
2.2V
0V
0V
5V
5V
4.8V
0V
5V
0V
0V
1.5V
2.4V
2.5V
2.5V
5V
0V
0V
0V
0V
0V
0V
5V
2.5V
0V
0V
0V
5V
4.7V
2V
0V
0V
2V
4.7V
0V
5V
2.3V