Zenith DVR313 Series, Service Manual

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3-7
8. No Signal of Component Screen in DISC Play.
YES
YES
NO Check V.MUTE TR
(Q714,Q715 ) ambient circuits. NO
Q714 Collector :LOW?
PN4701 -13 :No Y signal?
IC704 -52 :HIGH ?
(VIDEO MUTE )
Check IC2084 -3,46 =>
IC2081 - 4,5 signal flow.
Check IC712 power and
ambient circuits.
Check V. Buffer TR:Q752
power and ambient circuits.
No signal after checking
R777,773,727,728,CABLE?
Check IC1099=>IC4002
VO_D0 ~VO_D15 signal.
Check CIC4002 power and
ambient circuits.
Check X401 Clock generation
NO
NO
NO
YES
No Pb, Pr signal? No Y signal?
NO
YES
YES
IC4004 -8 :HIGH ?
/RST 7104
YES
Check IC2033 -8, 9
IC2001 - 4,5,6,8,9,10 Signal.
NO
NO
IC4004 -14,15
I2C CLK, DATA check
YES
Check IC4004 -19,20,36
Clock signal input.
NO
Check IC4009 -94 :VI_CLK0.
YES YES
YES
Check IC4002 =>IC4004
PD0 ~PD7 signal.
Check
VO_CLK and IC4002 -22
Phase conversion?
YES
YES
Check
IC1099 =>IC4002 -37
VO_CLK signal?