CD-BA1200 (serv.man10). Part 5 - Voltage table, Troubleshooting table, IC table - Sharp Audio Service Manual (repair manual)

cd-ba1200 (serv.man10) service manual
Model
CD-BA1200 (serv.man10)
Pages
13
Size
403.1 KB
Type
PDF
Document
Service Manual
Brand
Device
Audio / System / Part 5 - Voltage table, Troubleshooting table, IC table
File
cd-ba1200-sm10.pdf
Date

Read Sharp CD-BA1200 (serv.man10) Service Manual online

CD-BA1200H
– 36 –
VOLTAGE
0V
0V
0V
0V
0V
0V
4.67V
4.78V
0V
1.16V
2.25V
4.30V
4.85V
4.75V
4.74V
4.69V
4.78V
0V
5.0V
0V
0V
0V
4.85V
0V
4.69V
4.82V
0V
0.3V
0V
0V
0V
4.81V
4.81V
4.81V
4.9V
5.0V
4.9V
0V
0V
5.0V
9
8
7
6
5
4
3
2
1
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
40
39
38
37
36
35
34
33
32
31
PIN
NO.
NO.
VOLTAGE
IC701
PIN VOLTAGE
4.81V
4.81V
4.81V
0V
4.29V
–18.6V
–21.7V
–28.2V
–27.1V
–27.7V
0V
4.81V
0V
0V
27.8V
–27.8V
0V
0V
0V
0V
0V
–27.7V
–12.9V
–24.4V
60
59
58
57
56
55
54
53
52
51
61
74
73
72
71
70
69
68
67
66
65
64
63
62
–24.4V
–27.1V
–27.1V
–24.4V
–24.4V
–27.1V
–25.9V
–15.7V
–22.2V
–22.3V
–27.8V
–18.6V
–12.9V
–24.4V
–24.4V
–27.1V
78
77
76
75
79
90
89
88
87
86
85
84
83
82
81
4.78V
1.7V
9.45V
9.45V
9.45V
3.8V
4.89V
0V
4.89V
4.79V
50
49
48
47
46
45
44
43
42
41
–24.4V
–24.4V
–24.4V
–24.4V
–24.4V
–24.4V
–27.1V
–24.4V
–27.1V
–24.4V
100
99
98
97
96
95
94
93
92
91
80
1.9V
4.9V
0V
0V
1.6V
1.6V
2.1V
0V
0V
0V
0V
0V
2.1V
2.1V
2.1V
1.6V
1.6V
1.8V
2.1V
0V
0V
2.1V
4.9V
3.5V
4.9V
1.6V
2.1V
2.1V
0V
0V
0V
0V
0V
0V
0V
4.2V
9
8
7
6
5
4
3
2
1
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
36
35
34
33
32
31
0V
2.1V
2.1V
4.9V
2.1V
41
2.1V
42
40
39
38
37
PIN
NO. VOLTAGE
IC3
16.72V
0V
0V
0V
16.27V
0V
0V
0V
0V
34.2V
16.6V
0V
9
8
7
6
5
4
3
2
1
12
11
10
PIN
NO.
VOLTAGE
IC901
2.8V (0.2V)
0V (0V)
0.8V (0V)
1.5V (0V)
3.6V (0.4V)
1.5V (0V)
3.6V (0.4V)
3.5V (0.3V)
3.6V (0.3V)
9
8
7
6
5
4
3
2
1
PIN
NO.
VOLTAGE
IC301
19.12V
0V
10.04V
3
2
1
PIN
NO.
VOLTAGE
IC902
19.12V
0.64V
5.64V
3
2
1
PIN
NO.
VOLTAGE
IC904
10.04V
19.05V
9.57V
3
2
1
PIN
NO.
VOLTAGE
Q903
4.9V
0V
4.9V
3
2
1
PIN
NO.
VOLTAGE
IC704
0V
3.0V
3.3V
3.3V
0V
0V
0V
1.6V
1.6V
1.6V
1.6V
1.6V
1.6V
1.6V
1.7V
4.7V
0V
1.6V
0V
2.4V
3.3V
0V
1.6V
3.0V
0V
3.3V
0V
0.7V
0V
0V
0V
0V
0V
1.6V
3.3V
0V
1.6V
1.6V
1.6V
1.6V
0V
2.1V
2.1V
0V
3.3V   
3.5V
3.3V
3.3V
3.3V
1.6V
1.6V
1.5V
0V
1.5V
3.0V
3.3V
1.8V
3.0V
0V
0V
0V
1.7V
2.4V
0V
9
8
7
6
5
4
3
2
1
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
PIN
NO. VOLTAGE
51
64
63
62
61
60
59
58
57
56
55
54
53
52
3.4V
0V
0V
3.2V
0V
0V
0V
0V
0V
4.8V
4.9V
4.9V
4.6V
0V
4.9V
0V
68
67
66
65
69
80
79
78
77
76
75
74
73
72
71
70
IC2
0V
0V
0V
0V 
0.55V
2.16V
1.25V
0.58V
3.17V
3.55V
0V
0V
9
8
7
6
5
4
3
2
1
12
11
10
0V
4.72V
4.37V
3.67V
0.38V
0V
0V
0V
17
16
15
14
13
20
19
18
2.16V
0.55V
0V
0V
21
24
23
22
PIN
NO.
VOLTAGE
IC101
4.96V
4.96V
0V 
0V
0V
4.96V
4.96V
4.89V
4.78V
4.78V
4.78V
4.78V
9
8
7
6
5
4
3
2
1
12
11
10
4.78V
4.78V
4.78V
4.78V
5.1V
5.5V
5.0V
4.66V
17
16
15
14
13
20
19
18
5.03V
4.97V
10.0V
0V
21
24
23
22
PIN
NO.
VOLTAGE
IC601
9.87V
0V
2.15V
0V
0V
0V
4.83V
4.4V
0V
0V
4.64V
2.27V
9
8
7
6
5
4
3
2
1
12
11
10
2.13V
4.66V
0V
0V
4.86V
0.73V
0.73V
6.3V
17
16
15
14
13
20
19
18
0V
2.33V
21
22
PIN
NO.
VOLTAGE
IC302
4.65V
0V
2.12V
4.78V
2.12V
2.11V
4.65V
3.02V
4.78V
4.08V
1.63V
1.13V
9
8
7
6
5
4
3
2
1
12
11
10
1.29V
2.08V
1.31V
2.07V
0V
1.43V
1.99V
1.44V
17
16
15
14
13
20
19
18
2.08V
2.08V
21
22
4.48V
3.35V
23
24
PIN
NO.
VOLTAGE
IC303
1.6V
0V
1.6V
1.6V
1.6V
0V
0V
1.6V
3.3V
0V
0V
0V
0V
1.6V
1.6V
1.6V
1.6V
1.6V
1.6V
2.6V
1.6V
1.6V
1.6V
1.6V
1.6V
0V
0V
0V
1.6V
3.3V
9
8
7
6
5
4
3
2
1
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
PIN
NO. VOLTAGE
IC1
– 37 –
CD-BA1200H
Parts code
1.
CD optical pickup Lens cleaner disc
UDSKA0004AFZZ
TROUBLE SHOOTING
When the CD does not function
When the CD section does not operate when the objective lens of the optical pickup is dirty, this section may not operate. Clean
the objective lens, and check the playback operation. When this section does not operate even after the above step is taken, check
the following items.
Remove the cabinet and follow the trouble shooting instructions.
"Track skipping and/or no TOC (Table Of Contents) may be caused by build up of dust other foreign matter on the laser pickup
lens. Before attempting any adjustment make certain that the lens is clean. If not, clean it as mentioned below."
Turn the power off.
Gently clean the lens with a lens cleaning tissue and a small amount of isopropyl alcohol.
Do not touch the lens with the bare hand.
HOW TO USE
CAUTION
Cleaner Fluid
Cleaner disc
Using the brush in the cleaner cap, apply 1 or 2 drops of the cleaning fluid to the 
brush on the CD cleaner disc which has the mark next to it.
Place the CD cleaner disc onto the CD disc tray with the brush side down, then 
press the play button.
You will hear music for about 20 seconds and the CD player will automatically stop. 
If it continuous to turn, press the stop button.
1.
2.
3.
The CD lens cleaner should be effective for 30-50 operations, however if the 
brushes become worn out earlier then please the cleaner disc.
If the CD cleaner brushes become very wet then wipe off any excess fluid with a soft 
cloth.
Do not drink the cleaner fluid or allow it to come in contact with the eyes. In the 
event of this happening then drink and / or rinse with clean water and seek medical 
advice.
The CD cleaner disk must not be used on car CD players or on computer CD ROM 
drives.
All rights reserved. Unauthorized duplicating, broadcasting and renting this product 
(1) Check the power to IC2 (LC78641E), the presence of the clock signal (16.93 MHz) and the status of the RESET terminal
     (pin 71 on IC2).
(2) Did the pickup move to the PICKUP-IN Switch (SW4) position?
If (1) and (2)  are OK, check the system microcomputer (especially the communication line with the DSP).
2. Pressing the CD operation key is accepted, but playback does not occur.
(1) Focus-HF system check
(2) Tracking system check
(3) Spin system check
(4) PLL system check
(5) Others
1. "E-CD01" is displayed.
When a CD cannot be played
CD-BA1200H
– 38 –
If the level is not normal, check around pins 27~29 on IC1.
1. Is focus servo activated? (Waveform drawing 38-2)
 Pins 1~11 on IC1
Check the laser diode driver Q3 peripheral circuit.
Focus error circuit (pins 20 and 21 on IC1)
When a disc is loaded, start playback operation.
2. Does DRF change from "L" to "H"?
Is the disc rotating?
3. Is the HF waveform normal?  (Waveform drawing 38-3)
Check the spin system.
If the disc is spinning and a HF waveform is generated,
DRF will go H.
Figure 38-1
Check the laser diode driver Q3 peripheral circuit.
(1) Focus-HF system check
Although a CD is inserted and the cover is closed, "NO
DISC" is displayed.
1. Did the pickup move to the PICKUP-IN Switch (SW4)
position?
Sled motor (M2)
Press the OPEN/CLOSE switch (SW1) without inserting a
disc, and try starting the playback operation.
2. Does the focus (lens) move up and down?
    (Waveform drawing 38-1).
Check the focus peripheral circuit.
3. Is the laser lit?
Spindle motor (M1).
4. Is the turntable rotating?
Figure 38-2
Figure 38-3
Yes
Yes
Yes
No
No
No
No
No
No
No
Yes
Yes
No
T
FDO
TDO
Stopped
CH1=500mV
DC   10:1
CH3=500mV
DC   10:1
500ms/div
(500ms/div)
NORM:20kS/s
1
3
=Record Length=
Smoothing :   ON
CH1  :      0.000V
CH2  :          0.0V
Main  :      100K
Zoom  :         2K
Mode  :   AUTO
Type   :   EDGE CH1
Delay  :                   0.0ns
Hold off  :                0.2us
CH3  :      0.000V
CH4  :        0.00V
BW   : FULL
=Trigger=
=Filter=
=Offset=
CH1
  v/DIV
  500mV
T
FDO
DRF
TE
Stopped
CH1=500mV
DC   10:1
CH2=10V
DC   10:1
CH3=1V
DC   10:1
500ms/div
(500ms/div)
NORM:20kS/s
1
2
3
=Record Length=
Smoothing :   ON
CH1  :      0.000V
CH2  :          0.0V
Main  :      100K
Zoom  :         2K
Mode  :   AUTO
Type   :   EDGE CH1
Delay  :                   0.0ns
Hold off  :                0.2us
CH3  :        0.00V
CH4  :        0.00V
BW   : FULL
=Trigger=
=Filter=
=Offset=
-3div
-1div
0div
+1div
+3div
CH  Position  To
CH2
  Position
  0.20div
Vp-p=1.0V~1.3V
0.5mV/div,0.5
µ
sec/div
– 39 –
CD-BA1200H
The tracking servo is not activated.
Check the peripheral circuits at pins 18 and 19 on IC1, pin 23 on
IC2, and CNS1A/B.
If the waveform shown in Figure 39-1 appears and soon after
NO DISC appears.
(2) Tracking system check
Check the TE waveform at pin 18 on IC1.
A normal jump operation cannot be completed or the beginning of
the track cannot be found.
Check the around pin 23 on IC2.
"Initialization" is possible, but play is not possible.
Data cannot be read. Check the VCO-PLL system.
"Initialization" is not possible.
Figure 39-1
Figure 39-2
Press the OPEN/CLOSE switch without inserting a disc, and
then try starting the play operation.
(3) Spin system check
The spin driver circuit is OK.
1. The turntable rotates a little. (Waveform drawing 39-2)
Check around pin 25 on IC2, pins 15 and 16 on IC3, and CNS3A/B.
2. The turntable doesn't rotate.
T
T
TE
DRF
Stopped
CH1=10V
DC   10:1
CH2=1V
DC   10:1
100ms/div
(100ms/div)
NORM:100kS/s
2
1
=Record Length=
Smoothing :   ON
CH1  :           0.0V
CH2  :         0.00V
Main  :      100K
Zoom  :         2K
Mode  :   NORMAL
Type   :   EDGE CH1
Delay  :               2.924ms
Hold off  :                0.2us
CH3  :         0.00V
CH4  :         0.00V
BW   : FULL
=Trigger=
=Filter=
=Offset=
T
T
FDO
SPDO
Stopped
CH1=200mV
DC   10:1
CH2=500mV
DC   10:1
500ms/div
1999/04/07  09:51:15
(500ms/div)
NORM:20kS/s
2
1
=Record Length=
Smoothing :   ON
CH1  :      0.000V
CH2  :      0.000V
Main  :      100K
Zoom  :         2K
Mode  :   NORMAL
Type   :   EDGE CH2
Delay  :               2.924ms
Hold off  :                0.2us
CH3  :        0.00V
CH4  :        0.00V
BW   : FULL
=Trigger=
=Filter=
=Offset=
Yes
No
Yes
No
Yes
No
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