Remedies For Print Quality Troubles - Epson Stylus Pro 4910 Service Manual

Epson Stylus Pro 4900/Epson Stylus Pro 4910

2.5 Remedies for Print Quality Troubles

This section provides troubleshooting of print quality troubles classifying them by observed symptom. Before performing troubleshooting, refer to
nozzle check pattern. Confirm the printed result of the nozzle check pattern, and if any dot missing is found, perform the cleaning. Carry out "CL1" if nine nozzles or less are found,
and "CL2" if 10 nozzles or more are found.
Symptom
The nozzles are still clogging after
cleaning.
TROUBLE SHOOTING
Table 2-3. Print Quality Troubles
Cause
The Wiper is contaminated.
The Head Cap is contaminated.
There is some foreign material on the
Printhead.
There is something wrong in the pump
tube.
The ink is leaking.
There is air in the Ink Tubes.
The Head FFC is not connected
correctly.
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Remedies for Print Quality Troubles
Check Item
Check if the Wiper or the Wiper Cleaner is contaminated.
Check if the Head Cap is contaminated.
Check if there is some foreign material on the Printhead.
(See P.414)
Check if the pump tube of the IS Unit is caught.
Check if the Cartridge Holder, Ink Tubes and Ink Selector
are connected correctly.
Check if there is air in the Ink Tubes.
Check the connection of the Head FFC.
Check if the Head FFC is connected at a slant.
Check if the Head FFC is damaged.
Check if the terminal is peeled off.
If any of the remedies above does not help, conduct the
remedy in the column on the right.
Revision A
and print
"Nozzle Check" (p334)
Remedy
Clean the Wiper. (See P.415)
If the printer does not recover from the error after
cleaning, replace the following parts at a time.
Wiper (See P.236)
Wiper Cleaner (See P.237)
Clean the Head Cap. (See P.238)
If the printer does not recover from the error after
cleaning, replace the Head Cap. (See P.238)
Remove the foreign material if any. (See P.414)
If the tube is caught, re-install the IS Unit.
P.233)
Eject ink, and re-attach the connected parts with a
torque driver. Be sure to attach the O ring correctly
when reattaching them.
Perform a cleaning (CL3).
Connect the Head FFC again.
If the printer does not recover from the error, the
cause may be the breaking of the Head FFC.
Replace the Head FFC (See P.249).
Replace the following parts in the order below.
Printhead (See P.232)
Main Board (See P.152) (The fuse may has
blown)
Confidential
(See
76