Troubleshooting
Rev. A
5-1
5.5 Repair of the M-4J60 Printer Mechanism
This section provides information which allows you to repair and replace defective components of the M-
4J60 printer mechanism. Table 5-8, 5-9, and 5-10 contain various symptoms and the corresponding
causes listed in order of possibility. Find the symptom in the table and troubleshoot the problem as
instructed.
Condition Cause Checkpoint Solution
Symptom : The CR unit moves abnormally.
The CR unit moves
abnormally at power
on
Cleaner lever and
CR are interfering
with each other.
Check if the cleaner lever lock is
released with the CR unit on the platen
side.
Push the lever down
manually to clear the
lever of the CR route.
Symptom : The pump unit operates abnormally
.
The pump unit
operates abnormally
at power on.
Cam select
assembly or cam
change lever in
the CR unit is
defective.
Check if it is normally operating by
performing cleaning and loading and
ejecting paper using the control panel.
Replace the cam
select assembly or
cam change lever in
the CR unit.
The pump motor
is defective.
Check if the resistance of the motor
coil is as follows;
7.7 Ω ± 10 % at 25 °C per phase
(Refer to Table 5-1.)
Replace the pump
motor.
Symptom : Ink absorption is abnormal.
Ink is does not drain
into the ink drain pads
normally.
Cleaning is repeated,
Ink drain tube is
caught in the
cleaner lever in
the pump unit.
Check if the tube is properly routed. Route the tube
properly.
but it does not solve
the dot missing
problem.
The tube is
disconnected from
the cap.
Check if the tube is securely
connected.
Connect the tube
securely.
Ink drain tube is
bent or damaged.
Check if the tubes in the pump unit and
under the cap are bent or damaged.
Replace the pump unit.
The cap is
damaged.
Check if the cap is damaged. Replace the pump unit.
The pump unit is
defective.
Rotate the pump manually and check if
it rotates with constant resistance and
check if it is damaged.
Replace the pump unit.
The printhead is
defective.
Check if signals are transferred to the
printhead.
Replace the printhead.
Symptom : CR motor operates abnormally
Abnormal rotation at
power on.
Foreign objects
are lodged in the
CR mechanism.
Check visually if any foreign object is
lodged.
Remove the foreign
object.
CR motor is
defective.
Check if the resistance of the motor
coil is as follows;
5Ω ± 7% at 25 °C per phase
(Refer to Table 5-1.)
Replace the CR motor.
CR motor rotates, but
the CR unit does not
The timing belt is
damaged or
Check if the timing belt is installed at
the specified position in the CR unit.
Reinstall the timing
belt properly.
move. disengaged. Check if the timing belt is bent, worn
out or has a lack of some teeth.
Replace the timing
belt.
CR motor sub
pulley is
Check if some teeth of the sub pulley
broke off.
Replace the CR motor.
damaged.
Table 5-9 Repair of M-4I60 Printer Mechanism.
