Service manual

SERVICE MANUAL MASTER FILE
ENGLISH
Rev. A (1997/05/07)
3-16
.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.
Table 3-11. 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 substances
are 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, also
verify CR motor driver
IC8 on the main board.
Replace the CR
motor (and main
board, if
necessary).
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 belt drive or
driven pulley is
defective.
Verify the pulleys which
are broken or worn.
Replace the
pulleys.
The timing belt is
defective.
Verify the timing belt is
set correctly to the
carriage.
Reset the belt to
the carriage.
Verify whether the timing
belt is broken or not.
Replace the belt.
The carriage moves to
the left slightly, then
stops.
The carriage
movement is not
smooth.
Verify whether the
carriage moves smoothly
when move 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.
Verify the HP detector by
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.
Verify whether FFC is
set or not to the
printhead or the main
board.
Set 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,
also verify the drivers on
the main board.
Replace the
printhead, (and
drivers , if
necessary).