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8.NO RASTER
Is the voltage
at Pin 76,69 of IC501 5V ?
Yes
Does the square
waveform from Pin 17
of IC702 appear?
No
Check / Replace
IC702
Yes
Is the waveform at
collector Q402 normal?
No
Check / Replace
Q402,T401
Yes
Is the waveform at
collector Q403 normal?
No
Check / Replace
Q403
Yes
Check / Replace
T401
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Check +B voltage
115V or not
OK
No
Check 5V,9V,
12V lines
Yes
Check IIC bus lines
(SDA,SCL)
- 24 -
0V
Open
Check F801
OK
Check / Replace
F801,D815
IC801
Check the voltage
0V
of C812(+)
Check / Replace
D815
Check the voltage
Lower than 6V
at pin 4 of IC801
Check / Replace
D805,Q801
6~8 V
ZD801
Check/Replace IC887,IC871
Check the 2nd voltage are
short or not
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