Philips BTM2310/77 Panduan Servis - Halaman 21
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Halaman Cetak
TROUBLE SHOOTING
C: NO SOUND
YES
Check power amplifier D307 if
with 17.5 voltage or not
YES
Check U7：1st feet of PT7314
is with 9V power supply or not
YES
Check 2nd feet of IC400
STANDBY function if with high
level or not，4th feet MUTE
function is with low level or
not
YES
Check U1 No.102 and 103 feet
SCL，SDA waveform is normal or
not
YES
Audio output ok
D: NO DISC
YES
Check U1's power supply
3.3V,1.8V voltage，U2's 5V
YES
Push the laser head to outer
rail, check if can auto
introskip by power on
YES
Refer to A maintenance
NO
method
NO
Check power supply circuit:
Q308，Q309，ZD5 etc.
component
Check MUTE circuit: D400，
NO
Q400，Q401，Q402，D402 and
STANDBY circuit: D403，Q403
etc component
Check 12C circuit: U1，U3，
NO
R39，R41，R100，R102 etc
component
Check D308，IC301，IC302，D3，Q301，
NO
Q302 etc. components
NO
Check Q20's RESET signal, R42，U1，
U2's SLEGP signal and 6PIN soft flat
cabel