Zenith DVR313 Series, Service Manual

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3-6
7. No Outside Input 2 Audio
YES
Check <No audio output
appears in DISC Play>. NO
Check IC6905 -13,14:
Audio signal input.
Audio
appears even in DISC
Play.
Check IC12 -4:
DATA output.
Check
IC712 -2,3,7 signal input.
IC6903 -1 :HIGH?
(AI_SEL)
Is
IC6903-4 in the outside
input 2 low?
(/AI_SEL )
Check IC712 power and
ambient circuits.
IC2033 power and signal flow
Check IC6903 power and
ambient circuits.
Check IC6904 (OP-AMP)
power and ambient circuits.
Check IC6037 I/O circuits.
Check IC6037 I/O circuits.
NO
NO NO
NO
NO
YES
YES
IC6905 -16 :HIGH?
(/RST_ADC )
Check IC2084 -9,40 =>
IC2078 - 14,15 signal flow. NO
YES
YES YES
YES