XL-HP404 (serv.man10). (7) Operation flowchart - Sharp Audio Service Manual (repair manual)

xl-hp404 (serv.man10) service manual
Model
XL-HP404 (serv.man10)
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4 Few pages! See other manuals at the bottom of the first or last page.
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372.3 KB
Type
PDF
Document
Service Manual
Brand
Device
Audio / System / (7) Operation flowchart
File
xl-hp404-sm10.pdf
Date

Read Sharp XL-HP404 (serv.man10) Service Manual online

XL-HP404E/HP404H
7 – 1
Audio
XL-HP404E/HP404H
Service Manual
XL-HP404H
Market
E
 
CHAPTER 7. 
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.
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. 
2. When a CD cannot be played
2.1. "E-CD01" is displayed.
1) Check the power to IC1 (LC78648E), the presence of the clock signal (16.9344 MHz) and the status of the RESET terminal (pin 67 on IC1).
2) Does the pickup move to the PICKUP-IN Switch (SW1A) position?
If (1) and (2) are OK, check the system microcomputer (especially the communication line with the DSP).
2.2. 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
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-HP404E/HP404H
7 – 2
Although a CD is inserted and the cover is 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.
Figure 1
T
FDO
TDO
Stopped
CH1=500 mV
DC 10:1
CH3=500 mV
DC 10:1
500 ms/div
(500 ms/div)
NORM:20 kS/s
1
3
=Record Length=
Smoothing : ON
CH1 :
0.000 V
CH2 :
0.0 V
Main :
100 K
Zoom :
2 K
Mode : AUTO
Type : EDGE CH1
Delay :
0.0 ns
Hold off :
0.2 µs
CH3 :
0.000 V
CH4 :
0.00 V
BW : FULL
=Trigger=
=Filter=
=Offset=
CH1
v/DIV
500 mV
1. Does the pickup move to the PICKUP-IN Switch (SW1A) posi-
tion?
No
Sled motor (M2A).
Yes
2. Does the focus (lens) move up and down?
(Waveform drawing Figure 1)
No
Check the focus peripheral circuit.
Yes
3. Is the laser lit?
No
Check the laser diode driver Q1 peripheral circuit.
Yes
4. Is the turntable rotating?
No
Spindle motor (M1A).
When a disc is loaded, start playback operation.
1. Is focus servo activated?
(Waveform drawing Figure 2)
No
Pins 7~11, 13,19 and 20 on IC1
Check the laser diode driver Q1 peripheral circuit.
Yes
2. Does DRF change from "L" to "H"?
No
Is the disc rotating?
No
Check the spin system.
Yes
If the disc is spinning and a HF waveform 
is generated, DRF will go H.
3. Is the HF waveform normal?
(Waveform drawing Figure 3)
No
If the level is not normal.
Figure 2
T
FDO
DRF
TE
Stopped
CH1=500 mV
DC 10:1
CH2=10 V
DC 10:1
CH3=1 V
DC 10:1
500 ms/div
(500 ms/div)
NORM:20 kS/s
1
2
3
=Record Length=
Smoothing : ON
CH1 :
0.000 V
CH2 :
0.0 V
Main :
100 K
Zoom :
2 K
Mode : AUTO
Type : EDGE CH1
Delay :
0.0 ns
Hold off :
0.2 µs
CH3 :
0.00 V
CH4 :
0.00 V
BW : FULL
=Trigger=
=Filter=
=Offset=
-3 div
-1 div
0 div
+1 div
+3 div
CH Position To
CH2
Position
0.20 div
Figure 3
Vp-p=1.0 V~1.3 V
0.5 mV/div,0.5 µsec/div
XL-HP404E/HP404H
7 – 3
Check the TE waveform at pin 17 on IC1.
(2) Focus-HF system check.
If the waveform shown in Figure 4 appears and soon after NO 
DISC appears?
Yes
The tracking servo is not activated.
Check the peripheral circuits at pins 16, 17 and 22 on IC1, and 
FFC1.
No
"Initialization" is possible, but play is not possible?
Yes
A normal jump operation cannot be completed or the beginning 
of the track cannot be found.
Check the around pin 22 on IC1.
No
"Initialization" is not possible.
Data cannot be read. Check the VCO-PLL (Pin76~80 on IC1) 
system.
Figure 4
T
T
TE
DRF
Stopped
CH1=10 V
DC 10:1
CH2=1 V
DC 10:1
100 ms/div
(100 ms/div)
NORM:100 kS/s
2
1
=Record Length=
Smoothing : ON
CH1 :
0.0 V
CH2 :
0.00 V
Main :
100 K
Zoom :
2 K
Mode : NORMAL
Type : EDGE CH1
Delay :
2.924 ms
Hold off :
0.2 µs
CH3 :
0.00 V
CH4 :
0.00 V
BW : FULL
=Trigger=
=Filter=
=Offset=
(3) Spin system check.
Press the OPEN/CLOSE switch without inserting a disc, and 
then try starting the play operation.
1. The turntable rotates a little?
(Waveform drawing Figure 5)
Yes
The spin driver circuit is OK.
No
2. The turntable doesn't rotate.
Check around pin 24 on IC1, pins 3 and 4 on IC2, and CNW3.
Figure 5
T
T
FDO
SPDO
Stopped
CH1=200 mV
DC 10:1
CH2=500 mV
DC 10:1
500 ms/div
1999/04/07 09:51:15
(500 ms/div)
NORM:20 kS/s
2
1
=Record Length=
Smoothing : ON
CH1 :
0.000 V
CH2 :
0.000 V
Main :
100 K
Zoom :
2 K
Mode : NORMAL
Type : EDGE CH2
Delay :
2.924 ms
Hold off :
0.2 µs
CH3 :
0.00 V
CH4 :
0.00 V
BW : FULL
=Trigger=
=Filter=
=Offset=
XL-HP404E/HP404H
7 – 4
The HF waveform is normal and the time is displayed nor-
mally, but no sound is produced. Or the sound has drop-
outs.
When a disc is loaded, start play operation.
The HF waveform is normal, but the TOC data cannot be read.
Check the PDO waveform. (Figure 6)
Check around pins 76~80 on IC1.
Figure 6
T
FDO
PDO2
PDO1
Stopped
CH1=500 mV
DC 10:1
CH3=1 V
DC 10:1
CH4=1 V
DC 10:1
500 ms/div
(500 ms/div)
NORM:20 kS/s
1
4
3
=Record Length=
Smoothing : ON
CH1 :
0.000 V
CH2 :
0.0 V
Main :
100 K
Zoom :
2 K
Mode : AUTO
Type : EDGE CH2
Delay :
0.0 ns
Hold off :
0.2 µs
CH3 :
0.00 V
CH4 :
0.00 V
BW : FULL
=Trigger=
=Filter=
=Offset=
CH1
v/DIV
500 mV
1999/04/05 17:33:17
(5) Others.
Is pin 69 (C2F) on IC1 "L"?
No
There are too many error flags on a damaged disc which makes 
error correction impossible.
Yes
1. When playing at normal speed.
Check the peripheral circuit at pin 39 (DOUT) on IC1 and the 
waveform (Figure 7).
Check again using a known good disc.
If OK, Check the unit.
Figure 7
T
T
DOUT
Stopped
CH1=2 V
DC 10:1
500 ns/div
1999/04/07 09:25:28
(500 ns/div)
NORM:200 MS/s
1
=Record Length=
Smoothing : ON
CH1 :
0.00 V
CH2 :
0.00 V
Main :
1 K
Zoom :
100
Mode : NORMAL
Type : EDGE CH1
Delay :
2.887 ms
Hold off :
0.2 µs
CH3 :
0.00 V
CH4 :
0.00 V
BW : FULL
=Trigger=
=Filter=
=Offset=
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