Epson FX 890 Service Manual - Page 46

Repairing The Printer Mechanism - printing problems

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FX-1180/FX-880 Service Manual Chapter 3 Troubleshooting 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 the following tables and find out other potential causes. Table 3-12. Repairing the Printer Mechanism Symptom Cause Checkpoint Solution w Problem: The CR motor fails to operate. The CR motor fails to Foreign matter is Manually move the Remove the drive the timing belt lodged in the timing belt to see if the foreign substance. after power on. mechanism. motor can rotate freely. The CR motor is Measure the motor coil Replace the CR defective. resistance. It should be motor (and main about 16 ohms. If the board, if coil is shorted, check CR necessary). motor driver IC8 on the main board. w Problem: The carriage dose not operate at power on (after carriage has been manually centered prior to power on). The CR motor rotates, The belt drive or Check the pulleys which Replace the but the carriage dose driven pulley is are broken or worn. pulleys. not move. defective. The timing belt is Check if the timing belt Reset the belt to defective. is correctly set to the the carriage. carriage. Check if the timing belt Replace the belt. is broken. The carriage moves to The carriage Check if the carriage Clean and the left slightly, then movement is not moves smoothly as you lubricate the CR stops. smooth. move it manually. guide shaft or frame. Otherwise, replace the CR motor. The carriage moves to The HP detector is Check the HP detector Replace the HP the left or right end, defective. using a multi meter. detector. then stops. w Problem: Self test printing is not executed. The carriage moves, The printhead FFC Check whether FFC is Connect the FFC but dose not print. common wires are properly connected to to the printhead or disconnected. the printhead or the the main board main board. correctly. The printhead is Measure the printhead Replace the defective. coil resistance. It should printhead, (and be about 8 ohms. If the drivers , if printhead is shorted, necessary). check the drivers on the main board. Rev. B 3-16

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FX-1180/FX-880 Service Manual
Chapter 3 Troubleshooting
Rev. B
3-16
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 the following
tables and find out other potential causes.
Table 3-12. Repairing the Printer Mechanism
Symptom
Cause
Checkpoint
Solution
▼
Problem:
The CR motor fails to operate.
The CR motor fails to
drive the timing belt
after power on.
Foreign matter is
lodged in the
mechanism.
Manually move the
timing belt to see if the
motor can rotate freely.
Remove the
foreign substance.
The CR motor is
defective.
Measure the motor coil
resistance. It should be
about 16 ohms. If the
coil is shorted, check CR
motor driver IC8 on the
main board.
Replace the CR
motor (and main
board, if
necessary).
▼
Problem:
The carriage dose not operate at power on (after carriage has been manually
centered prior to power on).
The CR motor rotates,
but the carriage dose
not move.
The belt drive or
driven pulley is
defective.
Check the pulleys which
are broken or worn.
Replace the
pulleys.
The timing belt is
defective.
Check if the timing belt
is correctly set to the
carriage.
Reset the belt to
the carriage.
Check if the timing belt
is broken.
Replace the belt.
The carriage moves to
the left slightly, then
stops.
The carriage
movement is not
smooth.
Check if
the carriage
moves smoothly as you
move it manually.
Clean and
lubricate the CR
guide shaft or
frame. Otherwise,
replace the CR
motor.
The carriage moves to
the left or right end,
then stops.
The HP detector is
defective.
Check the HP detector
using a multi meter.
Replace the HP
detector.
▼
Problem:
Self test printing is not executed.
The carriage moves,
but dose not print.
The printhead FFC
common wires are
disconnected.
Check whether FFC is
properly connected to
the printhead or the
main board.
Connect the FFC
to the printhead or
the main board
correctly.
The printhead is
defective.
Measure the printhead
coil resistance. It should
be about 8 ohms. If the
printhead is shorted,
check the drivers on the
main board.
Replace the
printhead, (and
drivers , if
necessary).