Epson Stylus Color 1520 Service Manual page 130

5.5 Repairing the M-4I60 Printer Mechanism
This section provides information that allows you to repair and replace defective components of the M-4160
printer mechanism. Tables 5-8, 5-9, and 5-10 contain various symptoms and the corresponding causes listed
in order of most likely possibility.
Table 5-8. Repair of M-4I60 Printer Mechanism (1)
Symptom Condition
CR unit Abnormal
operates operation at
abnormally. power on.
Pump unit Abnormal
operates rotation of
abnormally. the PF
motor at
power on.
Ink absorption Ink is not
is abnormal drained
normally.
When a
cleaning
sequence is
repeated, it
does not
solve the
missing dot
problem.
CR motor Abnormal
operates rotation at
abnormally power-on
CR motor
rotates, but
the CR unit
Does not
move.
Cause Checkpoint
Cleaner lever and Check if the lock of the
CR are interfering cleaner lever is released
with each other. when the CR is on the paper
feeding side.
Cam select Check if it's operating normally
assembly or cam by running cleaning and paper
change lever in load/eject with the control panel.
the CR unit is
defective.
PF motor is Check if the resistance of the
defective. motor coil is as follows:
10 Ω ± 10 % at 77°F (25°C)
(Refer to Table 5-1.)
Ink drain tube is Check if the tube is placed
caught in the properly.
cleaner lever of
the pump unit.
The tube is Check if the tube is securely
disconnected from installed.
the cap.
Ink drain tube is Check if the tubes in the
bent or damaged. pump unit or under the cap are
deformed or damaged.
The cap is Check if the cap is damaged.
damaged.
The pump unit is Rotate the pump unit
damaged. manually and check if it rotates
with constant resistance. Check
if it is damaged.
Printhead unit is Check if signals are
defective. transferred to the printhead unit.
Foreign objects Check visually if foreign objects
are lodged in the are trapped in the CR
CR mechanism. mechanism.
CR motor is Check if the resistance of the
motor coil is as follows: Ω ± 7%
defective.
at 77°F (25°C) per phase
(Refer to Table 5-1.)
The timing belt is Check if the timing belt is at the
damaged or specified position in the CR unit.
dislocated.
Check if the timing belt is
deformed or if some teeth are
worn or broken.
CR motor driven Check if the some teeth of
pulley is the pulley are missing.
damaged.
Troubleshooting
Solution
Push the lever down
manually to clear out
the CR path.
Replace the cam
select
assembly or cam
change lever in the
CR unit.
Replace the PF
motor.
Place the tube
properly.
Install the tube
securely.
Replace the pump
unit.
Replace the pump
unit.
Replace the pump
unit.
Replace the printhead
unit.
Remove the foreign
objects.
Replace the CR unit.
Reinstall the timing
belt properly.
Replace the timing
belt.
Replace the CR
motor.
5-13