Sharp QT-CD161H (serv.man2) User Manual / Operation Manual ▷ View online
QT-CD141H/161H//162H
– 25 –
WAVEFORMS OF CD CIRCUIT
1
1
3
5ms
0.50 V
IC801 20 F.E
0.50 V
IC801 20 F.E
1
5ms
5.0 V
IC801 54 DRF
5.0 V
IC801 54 DRF
STOP
PLAY
FOCUS
SERCH
2
0.5ms
1.00 V
HF
1.00 V
HF
0.5ms
5.0 V
HFL
5.0 V
HFL
0.5ms
5.0 V
TES
5.0 V
TES
1
2
3
CUE
4
5
3
0.5ms
1.00 V
H.F
1.00 V
H.F
1
2
3
0.5ms
5.0 V
HFL
5.0 V
HFL
0.5ms
5.0 V
TES
5.0 V
TES
REVIEW
4
5
3
0.5ms
10.0 V
JP+
10.0 V
JP+
0.5ms
10.0 V
JP-
10.0 V
JP-
0.5ms
0.50 V
JP
0.50 V
JP
0.5ms
1.00 V
TE
1.00 V
TE
6
7
9
8
6
7
9
8
50ms
10.0 V
JP+
10.0 V
JP+
CUE
50ms
10.0 V
JP-
10.0 V
JP-
50ms
0.50 V
JP
0.50 V
JP
50ms
1.00 V
TE
1.00 V
TE
6
7
9
8
6
7
9
8
11
10
11
10
12
12
REVIEW
50ms
10.0 V
JP+
10.0 V
JP+
50ms
10.0 V
JP-
10.0 V
JP-
50ms
0.50 V
JP
0.50 V
JP
50ms
1.00 V
TE
1.00 V
TE
0.5ms
10.0 V
JP+
10.0 V
JP+
0.5ms
10.0 V
JP-
10.0 V
JP-
0.5ms
0.50 V
JP
0.50 V
JP
0.5ms
1.00 V
TE
1.00 V
TE
PLAY
20ms
1.00 V
SPO
1.00 V
SPO
NORMAL DISC
TN0=01
TN0=01
20ms
2.00 V
CLV+
2.00 V
CLV+
PLAY
TCD-712 (140mm)
TN0=01
TN0=01
50ms
1.00 V
SPO
1.00 V
SPO
50ms
2.00 V
CLV+
2.00 V
CLV+
PLAY
TCD-712
5s
100mV
SLD
100mV
SLD
1
0.5s
100mV
SLD
100mV
SLD
1
QT-CD141H/161H/162H
– 26 –
TROUBLESHOOTING (CD SECTION)
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 troubleshooting 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."
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 troubleshooting 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.
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.
Dust gradually accumulates on the objective lens during use, and it may degrade performance.
To avoid this problem, use a cleaning disc designed for CD optical pickup lenses.
To avoid this problem, use a cleaning disc designed for CD optical pickup lenses.
HOW TO USE
1. 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.
2. Place the CD cleaner disc onto the CD disc tray with the brush side down, then press the play button.
3. You will hear music for about 20 seconds and the CD player will automatically stop. If it continues to turn, press the stop button.
3. You will hear music for about 20 seconds and the CD player will automatically stop. If it continues to turn, press the stop button.
CAUTION
The CD lens cleaner should be effective for 30 - 50 operations, however if the brushes become worn out earlier then please
replace 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 disc must not be used on car CD player or on computer CD ROM drives.
All rights reserved. Unauthorized duplicating, broadcasting and renting product is prohibited by law.
replace 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 disc must not be used on car CD player or on computer CD ROM drives.
All rights reserved. Unauthorized duplicating, broadcasting and renting product is prohibited by law.
Cleaning Disc
PARTS CODE:
UDSKA0004AFZZ
PARTS CODE:
UDSKA0004AFZZ
Cleaner Liquid
Figure 26
QT-CD141H/161H/162H
– 27 –
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 troubleshooting 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."
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 troubleshooting 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.
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.
See if the pick-up is in the pick-up in SW702(pu-in switch) position.
If the items mentioned above are OK, check the main
microcomputer IC501.
microcomputer IC501.
Yes
Yes
• The CD function will not work.
The CD operating keys don't work.
Check the CD, DPS microcomputer (IC501), power supply, 4.19
MHz and 16.93 MHz clock, and reset terminal.
MHz and 16.93 MHz clock, and reset terminal.
Check the waveform of SCK, SO (DATA) and SI (COMM).
Yes
Yes
Playback can be performed without a disc.
Yes
Does the output waveform of IC801(16)(FD) match that shown in
Fig. 27?
Fig. 27?
Check the area around IC803-BI801/CNS801.
Yes
Check the IC801(50)(CLK) line, 4MHz.
Check the microcomputer data on pins (51)(CL), (52)(DAT) and
(53)CE.
Check the microcomputer data on pins (51)(CL), (52)(DAT) and
(53)CE.
Figure 27
• The CD operating keys work.
No
Yes
No
Does the pick-up move up and down twice?
Focus search OK.
Focus search
is performed
two times
when play
operation is
done without
disc.
is performed
two times
when play
operation is
done without
disc.
0.5s
0.50 V
IC801 16 FD
0.50 V
IC801 16 FD
2
1
0.5s
0.50 V
IC801 15 TD
0.50 V
IC801 15 TD
Check the Focus - HF system.
QT-CD141H/161H/162H
– 28 –
Check the laser diode driver.
• Playback can only be performed when a disc
is loaded.
Does the DRF signal change from "L" to "H"?
No
If the disc is not turning, the DRF
should not change to "H".
should not change to "H".
Is HF waveform normal (see the Fig. 28-1, 2)?
Yes
Is the Focus servo active? (Can you hear it working?)
No
Check the area around IC801(16) - (21) (focus servo circuit).
L
evel is abnormal.
Check the periphery
of IC801 pins 41 and
42.
of IC801 pins 41 and
42.
No
Waveform is unstable.
Check the spin
system.
system.
Yes
Yes
Yes
Yes
Yes
Figure 28-2
Figure 28-1
Check the spin
system.
system.
HF
0.1V/DIV
0.5
0.1V/DIV
0.5
µ
sec/DIV(DC)
IC801
(When playing
back the disc)
(When playing
back the disc)
41
Waveform in case
of normal play-
back
of normal play-
back
3
2
1
1
4
0.5s
1.00 V
IC801 16 FD
1.00 V
IC801 16 FD
0.5s
10.0 V
IC801 12 CLV+
10.0 V
IC801 12 CLV+
0.5s
10.0 V
IC801 54 DRF
10.0 V
IC801 54 DRF
0.5s
2.00 V
IC801 7 TE
2.00 V
IC801 7 TE
Check the tracking system.
▼
▼
▼
• Check the tracking system.
Check waveform of IC801 pin 7 (TE).
Check the periphery of IC801
pin 8 to pin 15, and IC803 to
BI801/CNS801.
pin 8 to pin 15, and IC803 to
BI801/CNS801.
Tracking servo is inoperative.
The waveform shown in Fig. 28-3
appears, and no-disc state appears
soon.
appears, and no-disc state appears
soon.
Yes
Yes
Yes
Yes
Play is possible in
TEST mode.
TEST mode.
The unit will be initialz-
ed in Normal mode, but
it will not play back.
ed in Normal mode, but
it will not play back.
Normal jump is impeded, and the
program top cannot be reached.
program top cannot be reached.
Check the periphery of
IC801 pin 14.
IC801 pin 14.
Yes
Data cannot be read.
Check the VCO-PLL system.
Yes
3
4
5ms
1.00 V
IC801 7 TE
1.00 V
IC801 7 TE
5 ms
5.0 V
IC801 54 DRF
5.0 V
IC801 54 DRF
Figure 28-3
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