Repairing The Printer Mechanism - Epson FX-880 Service Manual

3.5 REPAIRING THE PRINTER MECHANISM

For detailed procedures for replacing or adjusting matter, refer to Chapter 4, Disassembly and
Assembly and Chapter 5, adjustments . If a problem or symptom occurs, refer to following tables to
try find other potential causes.
Symptom
Problem: The CR motor fails to operate.
The CR motor fails to
drive the timing belt
after power on.
Problem: The carriage dose not operate when power on (after carriage has been centered
prior to power on manually).
The CR motor rotates,
but the carriage dose
not move.
The carriage moves to
the left slightly, then
stops.
The carriage moves to
the left or right end,
then stops.
Problem: Self test printing is not executed.
The carriage moves,
but dose not print.
Rev. A
Table 3-11. Repairing the Printer Mechanism
Cause
Foreign substances
are lodged in the
mechanism.
The CR motor is
defective.
The belt drive or
driven pulley is
defective.
The timing belt is
defective.
The carriage
movement is not
smooth.
The HP detector is
defective.
The printhead FFC
common wires are
disconnected.
The printhead is
defective.
Chapter 3 Troubleshooting
Checkpoint
Manually move the
timing belt to see if the
motor can rotate freely.
Measure the motor coil
resistance. It should be
about 16 ohms. If the
coil is shorted, also
verify CR motor driver
IC8 on the main board.
Verify the pulleys which
are broken or worn.
Verify the timing belt is
set correctly to the
carriage.
Verify whether the timing
belt is broken or not.
Verify whether the
carriage moves
smoothly when move
manually.
Verify the HP detector
by multi meter.
Verify whether FFC is
set or not to the
printhead or the main
board.
Measure the printhead
coil resistance. It should
be about 8 ohms. If the
printhead is shorted,
also verify the drivers on
the main board.
FX-880 Service Manual
Solution
Remove the
foreign substance.
Replace the CR
motor (and main
board, if
necessary).
Replace the
pulleys.
Reset the belt to
the carriage.
Replace the belt.
Clean and
lubricate the CR
guide shaft or
frame. Otherwise,
replace the CR
motor.
Replace the HP
detector.
Set the FFC to the
printhead or the
main board
correctly.
Replace the
printhead, (and
drivers , if
necessary).
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