No Audio Output In Disc Play; No Optical / Digital Audio Output - Zenith DVR313 Series Service Manual

3. No Audio Output in DISC Play.

IC704 -46:HIGH ?
(LOW:AUDIO MUTE )
YES
No output of IC710.
YES
IC710 -1 :LOW?
(DAC RESET status)
YES
Is
IC710 -8,9 :I2C signal normal?
YES
Is
IC710 -3,4,5,6:signal normal?
YES
Check IC710 power and
ambient circuits

4. No Optical / Digital Audio Output

Is
PN6701 -2 signal normal?
YES
Check R120,FFC CABLE
signal flow.
NO Check IC704 power supply
and ambient circuits.
NO Check IC714 power supply
and ambient circuits.
NO
-26 :LOW status in the Tuner
Mode?(ADC1_SEL)
Check IC2084 -11, 38 signal
flow.
NO
Check IC 2072 -2,3,18,19
NO
Check R1A1,R118,R119,R121
Check IC711 power, ambient
NO
circuits.
PN6701
NO
YES
NO
3-3
Check IC2078 16PIN,R264
Check TR701,JK704
power and ambient circuits.