Service manual

3.2.3 Sync Failure
3.2.3.1 Horizontal Sync Unstable
Check the horizontal sync signal.
Expected failure point
IC102 on MAIN PWB or peripheral
circuits
NG
NG
Check the waveform at Pin 36 of IC102 on the MAIN
PWB (Approx. 5Vp
-
p).
NG
Check the horizontal sync signal.
Check the (H-SYNC) waveform at Pin 1 of
CN103 on the MAIN PWB.
(
A
pp
rox. 5V
p
-
p)
Horizontal
period
Horizontal
period
OK
Expected failure point
CN103 and FFC cable
OK
Expected failure point
Signal cable, IC216 or peripheral circuits
Check the (H-SYNC) waveform at Pin 14 of CN212 on the VIDEO
PWB (Approx 5Vp
-
p)
Check the horizontal sync signal.
Expected failure point
IC102, IC105, or peripheral circuits
Expected failure point
The horizontal oscillation circuit (See Item 3.4.2)
NG
OK
Check the horizontal sync signal or Hsync-out at Pin 38 of IC102.
Horizontal
period
OK
3-5