Service manual

3-56
ELECTRICAL TROUBLESHOOTING GUIDE
DVD PART
Replace IC301.
Refer to Front Part
Check short
Reconnect it.
1. µ-COM Circuit
A. No Power
Does Logo appear
on the screen?
Is oscillation of
X501 normal?
Are IC503 Pins193, 80
and 81 normal?
Does no DISC appear?
Does Hello
appear at FLD?
Is PVD02
connected normally?
Is PVD01 Pin1 normal?
The waveform
on AD(00~21) of IC501
normal?
Are IC301 Pins5, 26 normal?
Replace Main B/D.
Check the oscillation
Check short.
OK
Replace IC501
Check power.
(Refer to power)
If power is
normal
OK
POWER ON
1
1
YES
YES
YES
YES
YES
YES
YES
YES
A
NO
NO
NO
NO
NO
NO
NO
NONO
NO
A