Sharp XL-30V Service Manual page 44

XL-30V
• The SHARP logo is not displayed.
Is the voltage on pin 52 (VREF) on IC14V (ES2883F) about 1.3V?
Is a 13.5MHz clock signal available at pin 79 (PCLK) on IC14V?
Is the signal shown in waveform drawing 8, 9 and 10 being supplied
to pin 82 (HSYNC), pin 84 (VSYNC) and pin 86 (YUV7) on IC14V?
Is a video signal available at pin 64 (VDAC) on IC14V?
Check the terminal PWB connector and each transistor.
• Communication error
Is waveform like the one shown in the figure 2 repeating on the 47
pin (DATA), the 49 pin (BUSY), the 52 pin (STB), the 54 pin (SCK)
of IC15V?
Is waveform like the one shown in the figure 3 repeating on the 10
pin (VD_DO), the 9 pin (BUSY), the 4 pin (VD_STV), the 2 pin
(SCK) of IC17V?
Is waveform like the one shown in the figure 3 repeating on the 29
pin (VCD_IN), the 31 pin (VCD_BUSY), the 40 pin (VCD_STB), the
30 pin (VCD_CLK) of IC701?
Transmitting data is abnormal. IC15V or IC10V is defective.
• Pickup does not move up and down.
Is the following waveform outputted on the 33 pin (FOO) of IC802?
Is +6.2V on the 30 pin (VCC) and the 1 pin of IC804?
Is the following waveform obtained between the 25 pin and the 26
pin of IC804?
Is the above waveform obtained between the 3 pin and the 4 pin
of BI801/CNS801?
Connection of BI801/CNS801 is poor or the pickup is defective.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
1.5 ~ 2.5sec
Yes
Yes
1.5 ~ 2.5sec
Yes
Check C150V.
No
Check the soldering on IC14V and the voltage at each pin.
No
Check the soldering on IC15V (ES3880) and IC16V (16M
No
SDRAM) and the voltage at each pin.
Check the soldering at pin 64 on IC14V, and at R194V and
No
R178V. If there is no problem, IC14V is derective.
Check around IC15V and voltage. If OK, IC15V is defective.
No
Check around IC17V and voltage. If OK, IC17V is defective.
No
Check between IC701 and BI702/CNS702, connection of
No
BI702/CNS702 and CNP702, between CNP702 and BI809/
CNS809, connection of CNP809, between CNP809 and
IC17V.
IC802 is defective.
No
Check the PWB pattern among the 2 pin of BI605B/CNS605B
No
and the 1 pin of IC804 and the 30 pin (VCC).
Is +5 V on the 2 pin
No (MUTE) of IC804? No
Yes
Check the PWB pattern among the 33 pin (FOO) of IC802
and the 27 pin and the 28 pin of IC804. If OK, IC804 is
defective.
Check the PWB pattern between BI801/CNS801 and IC804.
No
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Check the PWB pattern between
the 2 pin of IC804 and the 33 pin
(CD_STB) of IC701.