Service manual

EPSON Stylus Color 400 Service Manual
Rev. A
5-13
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 Condition Cause Checkpoint Solution
Abnormal pump
mechanism
operation
Abnormal PF
motor operation
when the
power is turned
on.
Foreign substances
are loaded in the PF
gears.
Manually drive the
platen drive gear
and check it if it
rotates normally.
Remove any foreign
substances.
The PF motor is
defective.
(Refer to Table5-1)
Check the inner coil
resistance and see
if there is any
disconnection of the coil.
Exchange the PF
motor.
Ink is not
absorbed
or is poorly
absorbed.
Used ink does not
go through the
waste ink tube.
The pump tube is
crashed.
Check the tube
visually.
Fix the crashed part
by the airgun.
Capping rubber is
damaged or
deformed.
Check the capping
rubber visually.
Replace the cap
mechanism.
The tube is out of
the cap.
Check if the tube is out of
the cap visually.
Connect the tube
properly.
Pump bulb is not
closed at
absorption.
Check the bulb
operation visually.
Replace the cap
mechanism.
Abnormal carriage
operation.
Abnormal carriage
operation at power
on.
Foreign substance
in the CR drive
gear.
Check visually if
there is any
substances or not.
Remove any foreign
substances.
CR motor is
defective.
Check the inner coil
resistance and see
if there is any
disconnection of the coil.
Replace the CR
motor.
Abnormal carriage
operation during
printing.
Carriage movement
is not smooth.
Check whether the
carriage moves
smoothly when
moved manually.
Clean and lubricate
the carriage guide
axis.
Check tension of the
timing belt.
Adjust tension
mechanism or
exchange it.
Check if there is any
foreign substances
in the carriage path.
Remove any foreign
substances.
Printing is not
performed.
The carriage
moves, but no
printing is
performed.
Head FFC is out of
connection.
Check if the head
FFC on the board or
carriage is connected
surely.
Connect the FFC
properly.
The FFC is
disconnected
inside.
Check the FFC by using
a tester.
Replace the FFC.
I/C is defective. Install a new I/C and
perform the self-test.
Replace I/C.
Head unit is
defective.
If the condition does
not improve even
after 2or 3 times
cleaning operation,
replace the head
unit and perform the
self-test.
Replace the head
unit.
Table 5-9. Repair of the Printer Mechanism