Zenith DVT654, Service Manual

Page: 8 / 87

- 2-2 -
2. AUDIO µ-COM CIRCUIT
POWER ON
Does DVD Error
appear at
FLD?
Does
AV 1/2 FM87.5
appear at FLD?
Check
Connector(PN902)
Check power part
of Main B/D.
Check oscillator
of x101.
Check if IC101
PIN80 is High.
Check if IC101
PIN92 is High.
Check if IC101 PIN
31, 32, 51, 88 are high
(5V).
Check if IC101
PIN96 is High.
Replace IC101.
Does CD/DVD
appear at FLD?
Reconnect PN902 .
Refer to SMPS
OK.
Refer to oscillator
Circuit.
Check DVD Reset Waveform.
Check IC101 Reset Wavefrom.
Check 5V line.
Check Power section Circuit.
Does READING
appear at FLD?
Does no Disc or
Time appear at FLD?
Check if DVD an Audio
Micom Interface is OK.
Check power.
Check DVD Module.
Check SMPS.