CD-E250 (serv.man17). Troubleshooting — Sharp Audio Service Manual (repair manual)

Model
CD-E250 (serv.man17)
Pages
4 Few pages! See other manuals at the bottom of the first or last page.
Size
313.38 KB
Type
PDF
Document
Service Manual
Brand
Device
Audio / System / Troubleshooting
File
cd-e250-sm17.pdf
Date

View Sharp CD-E250 (serv.man17) Service Manual online

– 45 –
CD-E250E
CD-E550E
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.
Parts code
1.
CD optical pickup Lens cleaner disc
UDSKA0004AFZZ
TROUBLESHOOTING
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.
When a CD cannot be played
1. "E-CD01" is displayed.
(1) Check the power to IC401 (LC78646E), the presence of the clock signal (16.9344 MHz) and the status of the RESET terminal
     (pin 66 on IC401).
(2) Does the pickup move to the PICKUP-IN Switch (SW1) 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
CD-E250E
CD-E550E
– 46 –
Vp-p=1.0 V~1.3 V
0.5 mV/div,0.5 
µ
sec/div
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 
µ
s
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
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 
µ
s
CH3  :      0.000 V
CH4  :        0.00 V
BW   : FULL
=Trigger=
=Filter=
=Offset=
CH1
  v/DIV
  500 mV
If the level is not normal.
1. Is focus servo activated ?
 (Waveform drawing Figure 46-2)
 Pins 7~11, 79 and 80 on IC401
Check the laser diode driver Q409 peripheral circuit.
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 Figure 46-3)
Check the spin system.
If the disc is spinning and a HF waveform is generated,
DRF will go H.
Figure 46-1
Check the laser diode driver Q409 peripheral circuit.
(1) Focus-HF system check.
Although a CD is inserted and the cover is closed, "NO
DISC" is displayed.
1. Does the pickup move to the PICKUP-IN Switch (SW1)
position ?
Sled motor (NM801).
Press the OPEN/CLOSE switch (SW703) without inserting a
disc, and try starting the playback operation.
2. Does the focus (lens) move up and down ?
    (Waveform drawing Figure 46-1)
Check the focus peripheral circuit.
3. Is the laser lit ?
Spindle motor (NM802).
4. Is the turntable rotating ?
Figure 46-2
Figure 46-3
Yes
Yes
Yes
No
No
No
No
No
No
No
Yes
Yes
No
– 47 –
CD-E250E
CD-E550E
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 
µ
s
CH3  :        0.00 V
CH4  :        0.00 V
BW   : FULL
=Trigger=
=Filter=
=Offset=
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 
µ
s
CH3  :         0.00 V
CH4  :         0.00 V
BW   : FULL
=Trigger=
=Filter=
=Offset=
The tracking servo is not activated.
Check the peripheral circuits at pins 14, 15 and 20 on IC401, and
FC401.
If the waveform shown in Figure 47-1 appears and soon after
NO DISC appears ?
(2) Tracking system check.
Check the TE waveform at pin 15 on IC401.
A normal jump operation cannot be completed or the beginning of
the track cannot be found.
Check the around pin 20 on IC401.
"Initialization" is possible, but play is not possible ?
Data cannot be read. Check the VCO-PLL (Pin73~78 on IC401)
system.
"Initialization" is not possible.
Figure 47-1
Figure 47-2
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 Figure 47-2)
Check around pin 22 on IC401, pins 10 and 11 on IC402, and
CNS402.
2. The turntable doesn't rotate.
No
Yes
No
Yes
Yes
No
CD-E250E
CD-E550E
– 48 –
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 
µ
s
CH3  :        0.00 V
CH4  :        0.00 V
BW   : FULL
=Trigger=
=Filter=
=Offset=
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 
µ
s
CH3  :        0.00 V
CH4  :        0.00 V
BW   : FULL
=Trigger=
=Filter=
=Offset=
CH1
  v/DIV
  500 mV
1999/04/05  17:33:17
Is pin 52 (C2F) on IC401 "L" ?
Yes
No
The HF waveform is normal and the time is displayed
normally, but no sound is produced. Or the sound
has dropouts.
(5) Others.
There are too many error flags on a damaged disc which
makes error correction impossible.
Check again using a known good disc.
1. When playing at normal speed.
Check the peripheral circuit at pin 39 (DOUT) on IC401 and
the waveform (Figure 48-2).
If OK, Check the unit.
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 48-1)
Check around pins 73~78 on IC401.
Figure 48-1
Figure 48-2
Page of 4
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Here you can view online or download Sharp CD-E250 (serv.man17) Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair Sharp CD-E250 (serv.man17) System. Information contained in Sharp CD-E250 (serv.man17) service manual (repair manual) typically includes:

  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).