Epson SQ-1170 Service Manual page 139

REV.-A
Symptom Conditon
The printer
does not op- dead.
crate at all.
Table 5-5. Repair of Power Supply Board (Cont.)
Cause
Check the +35V line.
is dead.
Check the oscillation waveform and switching
dead. waveform of IC51.
2V
Oscillation Waveform (IC51, pin 5)
Switching Waveform (IC51, pin 8)
is dead.
5-12
Checkpoint
A . /
20
I
- -
I
Solution
Replace
Replace