Service manual

XG-XV1 E/A
TROUBLE SHOOTING TABLE (Continued)
Checking the oscillation circuit
Are voltages at IC401 and IC402 as
No
specified? Are there signal inputs at
pins (6) and (7)?
Yes
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I Check the +5V line, and IC408, IC801 l
t and their peripheral circuits.
I
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Check the oscillation of X401 and
---------------_I
Is there oscillation waveform output
at pin (1) of IC403? 14.31818 MHz
No
for NTSC, and 17.73447 MHz for
PAL and SECAM?
I
Check the level of 5pin switch of f
f IC403 and its peripheral parts.
t
----------------I
, Check the buffer circuit of Q428 thru t
, Q430, and its peripheral circuits,
f
--_----------___I
Checking IC801 (RGB signal output circuit)
Are there RGB output waveforms at
No
pins (31), (32) and (33) of IC801?
t Go to “No colour or unusual tone”,
f ‘No Y signal” or “Out of sync”.
I
----------------I
l performance at pins (17) and (18) of
l
Are A/D outputs of IC1504, IC1505 NO
- - - - - - - - - - - - - - - -’
and IC1506 as specified?
---w--w--------_
I Check the VCLK, IC1504, IC1505,
t
t IC1506 and their peripheral circuits. 1
t Go to “Checking the clock circuit and
l its peripheral circuits”.
f
----------------I
----------------I
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