Zenith DVD5201 Service Manual page 19

2. µ-COM Circuit
A. No Power
YES
Does Logo appear
on the screen?
YES
OK
1
Is oscillation of
X501 normal?
YES
Are IC501 Pins 193, 808
and 81 normal?
YES
A
VR166 - 923-03461
ELECTRICAL
YES
Does "Hello" appear at FLD?
Does "DV 50" Bars appear?
NO
NO
NO
Check the oscillation
NO
Check short.
OK
Replace IC501
or IC306.
POWER ON
NO
Is P3901
NO
connected normally?
Reconnect it.
Refer to Front Part
Replace IC502
19
YES
Check power.
(Refer to power)
If power is
normal
YES
Is P3901 Pin 8, 9, 18 normal?
NO
A
The waveform
NO NO
on 3, 5, 7 pin of IC502
normal?
YES
Replace Main B/D
DVD2 - SERVICING
1