Repair Of The Printer Mechanism - Epson Stylus Color 640 Service Manual

EPSON Stylus Color 440/640/740

3.5 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
Abnormal pump Abnormal PF motor
mechanism operation operation when the
power is turned on.
Ink is not absorbed or is Used ink does not go
poorly absorbed. through the waste ink
tube.
Abnormal carriage Abnormal carriage
operation. operation at power on.
Abnormal carriage
operation during
printing.
Printing is not The carriage moves,
performed. but no printing is
performed.
Chapter 3 Troubleshooting
Table 3-7. Repair of the Printer Mechanism
Cause Check Point
Foreign substances are Manually drive the platen drive gear and
loaded in the PF gears. check it if it rotates normally.
The PF motor is defective. Check the inner coil resistance and see if
there is any disconnection of the coil.
(Refer to Table5-1)
The pump tube is crashed. Check the tube visually.
Capping rubber is Check the capping rubber visually.
damaged or deformed.
The tube is out of the cap. Check if the tube is out of the cap visually.
Pump bulb is not closed at Check the bulb operation visually.
absorption.
Foreign substance in the Check visually if there is any substances or
CR drive gear. not.
CR motor is defective. Check the inner coil resistance and see if
there is any disconnection of the coil.
Carriage movement is not Check whether the carriage moves
smooth. smoothly when moved manually.
Check tension of the timing belt.
Check if there is any foreign substances in
the carriage path.
Head FFC is out of Check if the head FFC on the board or
connection. carriage is connected surely.
The FFC is disconnected Check the FFC by using a tester.
inside.
I/C is defective. Install a new I/C and perform the self-test.
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.
Revision A
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.
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