C117 Main Board Assembly Repair - Epson DFX-5000+ Service Manual

Troubleshooting

C117 MAIN Board Assembly Repair

The table below provides instructions to repair the C117 MAIN board. It describes
symptoms, likely causes, troubleshooting checkpoints, and solutions. The
checkpoints column provides waveforms, resistance values, and other values to
check when evaluating operation of a component that may be defective. Check
these values and repair the board as described in the solution column.
Table 5-10. C117 MAIN Board Assembly Component Repair
Symptom
The printer A HIGH level DRERR
signal was sent to the
does not
Cl 17 power supply
operate at all.
board, turning it off.
VPC signal (HIGH
level) was not sent to
Cl 17 power supply
board. (If VPC is
output to the power
supply, and the head
driver is not
defective, the gate
array is probably
defective.)
The reset circuit is
not operational (for
logic).
5-24
Cause
Measure the voltage level of the
DRERR signal at CNl or check
the head driver IC's voltage
waveform.
Check voltage waveform for VPC
signal when power is turned on
and verify voltage waveform for
head driver. (Refer to the head
driver waveform figure, above.)
Look at the voltage waveform for
the +5 V line (pin 3 of IC9) and the
reset signal (pin 1 of IC9).
Checkpoint
EPSON DFX-5000+ Service Manual
Solution
Replace the
head driver.
Replace the
head driver
or gate array.
Replace IC9.