Sharp XL-UH250 Service Manual - Page 81

When a USB cannot be played.

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3. When the USB does not function. 3.1. "NO MEDIA" is displayed. 1) Check the power to IC2 (VHITC94A70FG5), IC3 (RH-IXA123AW00) and CNP7 connector. 2) Check the system microcomputer (especially the communication line with the USB Host). 3) Check the grounding condition to IC2 (VHITC94A70FG5), IC3 (RH-IXA123AW00) and CNP7 connector. 4. When a USB cannot be played. 4.1. Pressing the USB operation key is accepted, but playback data does not occur. 1) D+ data line. 2) D- data line. 3) Others. (1) Focus-RF system check. Although a CD is inserted and the cover is closed, "NO DISC" is displayed. 1. Does the pickup move? XL-UH250 Press the Tray1 CD Eject Button without inserting a disc, and try starting the playback operation. 1 FDO IC1 9 2 10 TRO IC1 Figure 1 No Sled motor (M2A). Yes 2. Does the focus (lens) move up and down ? (Waveform drawing Figure 1) Yes 3. Is the laser lit ? No Check the focus peripheral circuit. No Check the laser diode driver Q1 peripheral circuit. Yes 4. Is the turntable rotating ? When a disc is loaded, start playback operation. 1. Is focus servo activated ? (Waveform drawing Figure 2) Yes 2. Is the RF waveform normal ? (Waveform drawing Figure 3) No Spindle motor (M1A). No Pins 5, 9, 94 and 95 on IC1, Pins 1, 2, 15 and 16 on IC2. Check the laser diode driver Q1 peripheral circuit. No If the level is not normal. 1 FDO 9 IC1 5 RFO 89 IC1 4 TEI 6 IC1 Figure 2 5 IC1 89 RFO 7 - 2 Figure 3

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XL-UH250
7 – 2
3. When the USB does not function.
3.1.
“NO MEDIA” is displayed.
1) Check the power to IC2 (VHITC94A70FG5), IC3
(RH-IXA123AW00) and CNP7 connector.
2) Check the system microcomputer (especially the
communication line with the USB Host).
3) Check
the
grounding
condition
to
IC2
(VHITC94A70FG5), IC3 (RH-IXA123AW00) and
CNP7 connector.
4. When a USB cannot be played.
4.1.
Pressing the USB operation key is accepted,
but playback data does not occur.
1) D+ data line.
2) D- data line.
3) Others.
Although a CD is inserted and the cover is closed,
"NO DISC" is displayed.
(1) Focus-RF system check.
Press the Tray1 CD Eject Button without inserting a disc, and try
starting the playback operation.
Figure 1
9
10
1
2
IC1
IC1
FDO
TRO
1. Does the pickup move?
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 5, 9, 94 and 95 on IC1, Pins 1, 2, 15 and 16 on IC2.
Check the laser diode driver Q1 peripheral circuit.
Yes
2. Is the RF waveform normal ?
(Waveform drawing Figure 3)
No
If the level is not normal.
Figure 2
IC1
IC1
IC1
9
6
89
4
5
1
TEI
RFO
FDO
Figure 3
IC1
89
5
RFO