Epson Stylus COLOR 1160 Service Manual page 73

EPSON Stylus COLOR 860/1160
Table 3-15. Cleaning does not Solve the Print Problem (continued)
Step Check Point
9 Is the head driving If a trapezoid waveform is not output in the
pre-driver defective? previous step, check all the power transistors (Q3 -
Q4) for base waveforms. Like the head transistor in
Step 8, the base terminal input the similar trapezoid
waveforms from the pre driver IC, but any wave
form is not input at Emita terminal. Replace the
Power Transistor.
If the waveforms are not output correctly on Base
terminal of each Power Transistor, replace the
IC10 or 11 on C298 Main Board.
Otherwise, replace the C298 Main Board.
Troubleshooting
Action
Overview
Revision C
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