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Power supply PWB-
check
Is 6 V applied to pins
NO
(7) and (8) of the con-
nector P704?
YES
Is 13 V applied to
NO
pins (3) and (4) of the
connector P704?
YES
Does the lamp turn
NO
on?
YES
Check the main
PWB.
1
Check peripheral cir-
cuits of IC703.
Are connectors P704
NO
and CN901 fully
inserted?
YES
Is DC voltage of 380 V
NO
applied to both ends
of C704?
YES
Is R766 in the OPEN
NO
status?
YES
Check circuits R766
and after or replace
R766.
8 – 5
Securely insert the con-
nectors.
Is pin (11) of the connec-
NO
tor P704 at "H"?
YES
Check peripheral circuits
of IC902.
Is LAMP-EN/SYNC sig-
NO
nal properly sent to pin
(14) of the connector
P704? (Refer to the
waveform chart
.)
1
YES
Are GATE waveforms of
NO
Q901 and Q903 appro-
priate? (See waveform
diagram
.)
8
XG-MB67X
Check the main
PWB.
Check the main
PWB.
Check the Power
PWB.
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