Read Sharp XG-XV2E (serv.man2) Service Manual online
40
XG-XV2E/M/A
TROUBLE SHOOTING TABLE
(Continued)
Checking the oscillation circuit
Yes
No
Check the +5V line, and IC408, IC801
and their peripheral circuits.
and their peripheral circuits.
Yes
No
Are there oscillation waveform inputs
at pin (4) of IC401 and IC402?
at pin (4) of IC401 and IC402?
Check the oscillation of X401 and
X402.
X402.
No
No
Is there oscillation waveform output
at pin (1) of IC403? 14.31818 MHz
for NTSC, and 17.73447 MHz for
PAL and SECAM?
at pin (1) of IC403? 14.31818 MHz
for NTSC, and 17.73447 MHz for
PAL and SECAM?
Check the level of 5-pin switch of
IC403 and its peripheral parts.
IC403 and its peripheral parts.
Check the buffer circuit of Q428 thru
Q430, and its peripheral circuits.
Q430, and its peripheral circuits.
Yes
Are voltages at IC401 and IC402 as
specified? Are there signal inputs at
pins (6) and (7)?
specified? Are there signal inputs at
pins (6) and (7)?
Checking IC801 (RGB signal output circuit)
Yes
No
Check the data transfer and other
performance at pins (17) and (18) of
video IC801.
performance at pins (17) and (18) of
video IC801.
No
Go to "No color or unusual tone", 'No
Y signal" or "Out of sync".
Y signal" or "Out of sync".
Yes
No
Are there output waveforms at the
emitters of Q1501, Q1502 and
Q1503?
emitters of Q1501, Q1502 and
Q1503?
Check Q801 thru Q803 (buffer),
IC1501 (amplifier), IC1502 (RGB
offset) and their peripheral circuits.
IC1501 (amplifier), IC1502 (RGB
offset) and their peripheral circuits.
No
Are A/D outputs of IC1504, IC1505
and IC1506 as specified?
and IC1506 as specified?
Check the VCLK, IC1504, IC1505,
IC1506 and their peripheral circuits.
IC1506 and their peripheral circuits.
Go to "Checking the PC circuit unit".
Yes
Are there RGB output waveforms at
pins (31), (32) and (33) of IC801?
pins (31), (32) and (33) of IC801?
Is there oscillation waveform output at
TP401?
TP401?
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