Epson Stylus Color 740 Service Manual

EPSON Stylus COLOR 440, 640, and 740 Chapter 3 Troubleshooting
82
3.5 Repair of the Printer Mechanism
This section provides instructions for repairin
g
the printer mechanism. It
describes various problems, likel
y
causes, and solutions. Look up the
s
y
mptom in the table below and check for malfunctionin
g
parts as
described in the checkpoint.
Table 3-7. Repair of the Printer Mechanism
Symptom Condition Cause Checkpoint Solution
Abnormal pump
mechanism operation
Abnormal PF motor
operation when the
power is turned on.
Foreign substances are
lodged in the PF gears.
Manually turn the platen drive gear and
check whether it rotates normally.
Remove any foreign substances.
The PF motor is defective.
(Refer to Table 3-1
)
Check the coil resistance. Replace 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 crushed. Inspect the tube. Use compressed air to fix the
crushed part.
Capping rubber is damaged
or deformed.
Inspect the capping rubber. Replace the capping mechanism.
The tube has pulled loose
from the cap.
Inspect the tube’s attachment to the cap. Connect the tube properly.
Air bleed valve does not
close properly.
Check bleed valve operation by hand. Replace the capping mechanism.
Abnormal carriage
operation.
The carriage doesn’t
travel smoothly on the
carriage guide shaft, or
moves irregularly.
Foreign substance in the
CR drive gear.
Check for foreign substances. Remove foreign substances.
CR motor is defective. Check motor coil resistance. Replace the CR motor.
Carriage movement is not
smooth.
Check whether the carriage moves
smoothly when moved manually.
Clean and lubricate the carriage
guide shaft.
Check tension of the timing belt. Adjust tension mechanism or replace
it.
Check for foreign substances in the carriage
path.
Remove foreign substances.

Epson Stylus Color 740 Specifications

General

Brand	Epson
Model	Stylus Color 740
Category	Printer
Language	English