Sharp XL-UH4H (serv.man2) Service Manual ▷ View online
XL-UH4H
5 – 23
A
B
C
D
E
F
G
H
1
2
3
4
5
6
3
0
6
L
2
0
6
L
Figure 6-20: WIRING SIDE OF USB PWB (BOTTOM)
XL-UH4H
6 – 1
CHAPTER 6. 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 follow-
ing items.
check the playback operation. When this section does not operate even after the above step is taken, check the follow-
ing 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."
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-RF system check
2) Tracking system check
3) Spin system check
4) Others
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.
XL-UH4H
6 – 2
SC9641 reposit to 600MS
Confirm SLDGE
reposit or not?
reposit or not?
NO
Check SLED output and
drive circuit, see Figure 1
drive circuit, see Figure 1
YES
Start playback without Disc
Confirm Pick up
raise up down
focus aging
raise up down
focus aging
NO
Checking FOC drive
information,see Figure2
information,see Figure2
YES
Judge focus open
or close
or close
?
NO
Inspect the informationo of
LDON and the laser control
cricuit of SA9618
LDON and the laser control
cricuit of SA9618
Servohead inspect no disc
Put disc and then re-start playback
Whether disc is
stepped-up
playback
stepped-up
playback
NO
Whether focus is regular or
not, inspect focus reposit
not, inspect focus reposit
YES
Whether the 56pin
information of SC9641
raise change from high to
low
information of SC9641
raise change from high to
low
NO
Track raise change and can
not block the original track,
inspect track
not block the original track,
inspect track
YES
Have lock track.under regular
condition, can find every drive
wave(figure-3)
condition, can find every drive
wave(figure-3)
< Z1 : 2.5M >
CH 4
Display
500ms/div
Position
Coupling
DC1M
Probe
10:1
Offset
0:32 V
Bandwidth
Edge CH4
Auto
0.50 V
Auto
0.50 V
CH1 10:1
1.00 V/div
DC Full
1.00 V/div
DC Full
Full
ON
OFF
-0.
2
0div
IC902 19
3
IC902 4
IC901 64
< Z1 : 2M >
1s/div
CH1 10:1
2.00 V/div
DC Full
2.00 V/div
DC Full
CH1 10:1
2.00 V/div
DC Full
2.00 V/div
DC Full
Edge CH4
Auto
0.50 V
Auto
0.50 V
Freq (C1)
22.22222kHz
IC902 19
IC902 24
IC902 4
IC902 10
< Z1 : 2M >
1s/div
Edge CH4
Auto
0.50 V
Auto
0.50 V
CH1 10:1
2.00 V/div
DC Full
2.00 V/div
DC Full
CH2 10:1
2.00 V/div
DC Full
2.00 V/div
DC Full
CH3 10:1
2.00 V/div
DC Full
2.00 V/div
DC Full
CH4 10:1
2.00 V/div
DC Full
2.00 V/div
DC Full
CH 4
Display
Position
Coupling
DC1M
Probe
10:1
Offset
Bandwidth
Freq(C1)
FR-A(C4)
FR-A(C4)
Freq(C2)
50.00000kHz
40.00000kHz
43.75492kHz
43.75492kHz
Full
ON
OFF
-
3
.00div
0:
8
2 V
XL-UH4H
6 – 3
Whether RF wave-
form is ok (ftgure4)
form is ok (ftgure4)
NO
Check circuit of SA9618 of
RF
RF
YES
Check whether
disc is good
disc is good
YES
Confirm output
whether have noise
or wrong song
whether have noise
or wrong song
YES
Confirm Disc
format whether
CDDA or not
format whether
CDDA or not
NO
Whether 56pin
output raise any high
voltage impulse or
not
output raise any high
voltage impulse or
not
NO
Servo system ok
YES
YES
Confirm pin no.24 output
shows high voltage
impulse or not.
shows high voltage
impulse or not.
YES
NO
C2 cannot rectify if many
many wrong data during
read the Disc, cause wrong
song selected. Please
check Disc and whether
Pick-up is aging or not.
many wrong data during
read the Disc, cause wrong
song selected. Please
check Disc and whether
Pick-up is aging or not.
YES
C2 cannot rectify when raise
many wrong data under
reading Disc, as a result, which
exist any wrong songs. Please
check Disc and whether Pick-
up is aging or not.
many wrong data under
reading Disc, as a result, which
exist any wrong songs. Please
check Disc and whether Pick-
up is aging or not.
Confirm pin no. 24 output
is square wave of 88.2K is
stabil or not
is square wave of 88.2K is
stabil or not
0.2v
CH1
A>0.2µs
˜
6
IC901 12
Click on the first or last page to see other XL-UH4H (serv.man2) service manuals if exist.