Epson DFX-5000+ Service Manual page 198

Table 5-10. Cl17 MAIN Board Assembly Component Repair
Symptom
The self-test IC7 is defective.
is printed
incorrectly.
The head driver FETs
are defective.
The CPU is defective.
EPSON DFX-5000+ Service Manual
Cause
Observe the output signal at pins
129-l 37 of IC7.
Observe the voltage waveform at
the drain side.
I
Observe the PTS signal at pin 15
of the CPU.
Checkpoint
I I I I I
Troubleshooting
Solution
Replace IC7.
Replace the
abnormal
F E T .
I
Replace the
CPU.
5-31