Sharp DK-KP80PH (serv.man2) Service Manual ▷ View online
DK-KP80PH
4 – 1
CHAPTER 4. FLOWCHART
[1] Troubleshooting
1. When the CD does not function
The CD section may not operate when the objective lens of the optical pickup is dirty. 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.
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."
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.
2. When a CD cannot be played
2.1. 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
Parts code
1.
CD optical pickup Lens cleaner disc
UDSKA0004AFZZ
HOW TO USE
CAUTION
Cleaning 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 still play continuously, 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 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 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 players or on computer CD-ROM
drives.
All rights reserved. Unauthorized duplicating, broadcasting and renting this product
is prohibited by law.
DK-KP80PH
4 – 2
Although a CD is inserted and the cover is
closed, "NO DISC" is displayed.
closed, "NO DISC" is displayed.
(1) Focus-HF system check.
Press the Tray1 CD Eject Button without inserting a disc,
and try starting the playback operation.
and try starting the playback operation.
1. Does the pickup move to the PICKUP-IN Switch position?
No
No
Sled motor.
Yes
2. Does the focus (lens) move up and down?
(Waveform drawing Figure 1)
(Waveform drawing Figure 1)
No
Check the focus peripheral circuit.
Yes
Check the laser diode driver Q5 peripheral circuit.
3. Is the laser li ?
t
Yes
4. Is the turntable rotating?
No
Spindle motor.
When a disc is loaded, start playback operation.
1. Is focus servo activated?
(Waveform drawing Figure 2)
(Waveform drawing Figure 2)
No
Pins
114,115, 117,118 ( 122 ~129) on IC1
Check the laser diode driver Q5 peripheral circuit.
Yes
2. Is the HF waveform normal?
(Waveform drawing Figure 3)
(Waveform drawing Figure 3)
No
If the level is not normal.
Figure 2
118
117
IC1
IC1
1
2
FOP
TRP
Figure 1
118
78
IC1
IC1
1
4
FOP
TE
134
IC1
RFOUT
7
RFOUT
Figure 3
DK-KP80PH
4 – 3
Check the TE waveform at pin 63 on IC1.
(2) Tracking system check.
If the waveform shown in Figure 4 appears and soon after NO
DISC appears?
DISC appears?
Yes
The tracking servo is not activated.
Check the peripheral circuits at pins 114,115, 117, 118
on IC1 and FFC1.
Check the peripheral circuits at pins 114,115, 117, 118
on IC1 and FFC1.
No
"Initialization" is possible, but play is not possible?
Yes
A normal jump operation cannot be completed or the begining
of the track cannot be found.
Check the around pin 117 on IC1.
of the track cannot be found.
Check the around pin 117 on IC1.
No
"Initialization" is not possible.
Data cannot be read. Check the VCO-PLL (Pin141 ~144) on
IC1 system.
IC1 system.
(3) Spin system check.
Press the OPEN/CLOSE switch without inserting a disc, and
then try starting the play operation.
then try starting the play operation.
1. The turntable rotates a little?
(Waveform drawing Figure 5)
(Waveform drawing Figure 5)
Yes
The spin driver circuit is OK.
No
Check around pin 114 on IC1, pins 1 and 2 on CNP2.
2. The turntable doesn't rotate.
63
134
IC1
IC1
4
7
TE
RFOUT
118
114
IC1
IC1
1
3
FOP
SPOUT
Figure 5
Figure 4
DK-KP80PH
4 – 4
(4) PLL system check.
When a disc is loaded, start play operation.
The RF waveform is normal, but the TOC data cannot be read.
Check the PLL waveform. (Figure 6)
Check around pins 1
41~ 144 on IC1.
Figure 6
PLLF
PLLFO
FOP
143
118
IC1
IC1
142
IC1
1
5
6
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