Epson C117001-N Service Manual - Page 160

Repair continued, Table 5-6. C117 MAIN Board Assembly Component

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DFX-5000+ Service Manual Troubleshooting Table 5-6. C117 MAIN Board Assembly Component Repair (continued) Symptom The self-test is printed incorrectly. Cause IC7 is defective. Checkpoint Observe the output signal at pins 129-137 of IC7. Solution Replace IC7. The head driver FETs are defective. Observe the voltage waveform at the drain side. BVI Uv Replace the abnormal FET. The CPU is defective. Observe the PTS signal at pin 15 of the CPU. LIVH j2QV AT. l,92ms SAVE Replace the CPU. F\ + ++++ 5V 1 Rev. A S-23

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DFX-5000+
Service Manual
Troubleshooting
Table 5-6. C117 MAIN Board Assembly Component
Repair (continued)
Symptom
The self-test
is printed
incorrectly.
Cause
IC7
is defective.
The head driver
FETs
are defective.
The CPU is defective.
Checkpoint
Observe the output signal at pins
129-137 of
IC7.
Observe the voltage waveform at the
drain side.
B
VI
Uv
Observe the
PTS signal at pin 15 of
the
CPU.
LIVH
j2QV
AT.
l,92ms
SAVE
F
\
+
++++
5V
1
Solution
Replace
IC7.
Replace the
abnormal
FET.
Replace the
CPU.
Rev.
A
S-23