Repair Of The Printer Mechanism - Epson 440 Service Manual

5.4 Repair of the Printer Mechanism

This section provides instruction for repairing the printer mechanism. It describes various problems,
symptom, likely causes, checkpoints, and solutions. Select appropriate symptom from the table and check
each parts and its function as described in the checkpoint.
Symptom
Abnormal pump Abnormal PF motor
mechanism operation when the
operation power is turned on.
Ink is not Used ink does not
absorbed or is go through the
poorly absorbed. waste ink tube.
Abnormal carriage Abnormal carriage
operation. operation at power
on.
Abnormal carriage
operation during
printing.
Printing is not The carriage
performed. moves, but no
printing is
performed.
Rev. A
Table 5-9. Repair of the Printer Mechanism
Condition Cause
Foreign substances
are loaded in the
PF
gears.
The PF motor is
defective.
(Refer to Table5-1)
The pump tube is
crashed.
Capping rubber is
damaged or
deformed.
The tube is out of
the cap.
Pump bulb is not
closed at
absorption.
Foreign substance
in the CR drive
gear.
CR motor is
defective.
Carriage movement
is not smooth.
Head FFC is out of
connection.
The FFC is
disconnected
inside.
I/C is defective.
Head unit is
defective.
Chapter 5 Troubleshooting
Checkpoint
Manually drive the
platen drive gear
and check it if it
rotates normally.
Check the inner coil
resistance and see
if there is any
disconnection of the coil.
Check the tube
visually.
Check the capping
rubber visually.
Check if the tube is
out of the cap visually.
Check the bulb
operation visually.
Check visually if
there is any
substances or not.
Check the inner coil
resistance and see if
there is any
disconnection of the coil.
Check whether the
carriage moves
smoothly when
moved manually.
Check tension of the
timing belt.
Check if there is any
foreign substances
in the carriage path.
Check if the head
FFC on the board or
carriage is
connected surely.
Check the FFC by using
a tester.
Install a new I/C and
perform the self-test.
If the condition does
not improve even
after 2or 3 times
cleaning operation,
replace the head unit
and perform the self-test.
Solution
Remove any
foreign
substances.
Exchange the PF
motor.
Fix the crashed
part
by the airgun.
Replace the cap
mechanism.
Connect the tube
properly.
Replace the cap
mechanism.
Remove any
foreign
substances.
Replace the CR
motor.
Clean and
lubricate the
carriage guide
axis.
Adjust tension
mechanism or
exchange it.
Remove any
foreign
substances.
Connect the FFC
properly.
Replace the FFC.
Replace I/C.
Replace the head
unit.
5-13