Sharp XL-UR27H (serv.man2) Service Manual ▷ View online
XL-UR27H
7 – 2
3. When the USB does not function.
3.1. “NO MEDIA” is displayed.
3.1. “NO MEDIA” is displayed.
1) Check the power to IC1 (VHITC94A70FG8), IC3
(RH-IXA178AW00) and CNP7 connector.
2) Check the system microcomputer (especially the
communication line with the USB Host).
3) Check the grounding condition to IC1
(VHITC94A70FG8), IC3 (RH-IXA178AW00) and
CNP7 connector.
CNP7 connector.
4. When a USB cannot be played.
4.1. Pressing the USB operation key is accepted,
but playback data does not occur.
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.
2) D- data line.
3) Others.
Although a CD is inserted and the cover is closed,
"NO DISC" is displayed.
"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.
starting the playback operation.
Figure 1
9
10
1
2
IC1
IC1
FOO
TRO
1. Does the pickup move?
No
Sled motor (M2A).
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
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)
(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.
Check the laser diode driver Q1 peripheral circuit.
Yes
2. Is the RF waveform normal?
(Waveform drawing Figure 3)
(Waveform drawing Figure 3)
No
If the level is not normal.
Figure 2
IC1
IC1
IC1
9
6
89
4
5
1
TEI
RFO
FOO
Figure 3
IC1
89
5
RFO
XL-UR27H
7 – 3
Check the TE waveform at pin 6 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 6, 7, 10, 98 and 100 on
IC1, pins 17, 18, 35 and 36 on IC2 and FFC1.
Check the peripheral circuits at pins 6, 7, 10, 98 and 100 on
IC1, pins 17, 18, 35 and 36 on IC2 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 10 on IC1.
beginning of the track cannot be found.
Check the around pin 10 on IC1.
No
"Initialization" is not possible.
Data cannot be read. Check the VCO-PLL (Pins 72, 73, 74,
75, 76 and 78 on IC1) system.
75, 76 and 78 on IC1) system.
Figure 4
IC1
IC1
9
6
4
1
FOO
TEI
(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
2. The turntable doesn't rotate.
Check around pin 13 on IC1, pins 3, 4, 13 and 14 on IC2.
Figure 5
1
6
IC1
IC1
9
13
FOO
DMO
XL-UR27H
7 – 4
The RF waveform is normal and the time is displayed
normally, but no sound is produced. Or the sound has
dropouts.
normally, but no sound is produced. Or the sound has
dropouts.
(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 TMAX waveform. (Figure 6)
Check around Pins 72, 73, 74, 75, 76 and 78 on IC1.
Figure 6
IC1
IC1
IC1
IC1
9
13
76
74
7
8
6
1
FOO
DMO
LPFO
TMAX
(5) Others.
Is pin 65, 66 and 67 on IC1. (Figure 7)
No
There are too many error flags on a damaged disc which makes
error correction impossible.
error correction impossible.
Yes
Check again using a known good disc.
If OK, Check the unit.
Figure 7
IC1
IC1
IC1
67
66
65
9
10
11
BCKI
AIN
LRCKI
XL-UR27H
7 – 5
(6) USB system check_USB play.
Press USB function, insert the USB memory device into the
USB.
USB.
1. Does the device information can display?
No
Check around pin 79 and 80 or 1, 87, 88 and 89 on IC3.
(Figure 8 & 9)
(Figure 8 & 9)
2. The waveform and the time is displayed normal, but no
sound is produced.
sound is produced.
No
Check around pin 71, 92 and 93 on IC3. (Figure 10)
pin 65~67 on IC1. (Figure 7)
pin 65~67 on IC1. (Figure 7)
Figure 8
Figure 10
IC3
IC3
D +
D -
80
79
17
16
IC3
IC3
IC3
71
92
93
18
19
20
AIN
BCKI
LRCKI
Figure 9
Figure 11
IC3
IC3
IC3
IC1
TXD1
USB_REQ
RESET
88
87
89
1
RXD1
12
14
15
13
IC7
IC7
9
10
22
IC7
12
23
21
SDTO
LRCK
SCLK
(7) USB system check_USB recording.
Press USB record at remote control to start recording.
1. Does FL show “USB FULL”?
Yes
Check memory device capacity. Is the memory device full?
Or check if write protected key is locked?
Or check if write protected key is locked?
No
2. USB recording is OK?
No
Check around pin 9, 10 & 12 on IC7. (Figure 11)
Yes
3. Does the FL show “NO SUPPORT” when playing back
recorded song?
recorded song?
Yes
Check around pin 9, 10 & 12 on IC7. (Figure 11)
Yes
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