Epson Stylus Pro 4910 Service Manual page 76

Epson Stylus Pro 4900/Epson Stylus Pro 4910
Symptom
Gaps can be seen in the borders.
TROUBLE SHOOTING
Table 2-3. Print Quality Troubles
Cause
Adjustment failure of the Ink Mark
Sensor
Ink Mark Sensor is damaged.
The printhead has not been adjusted
properly.
Adjustment failure of the height of PG
Remedies for Print Quality Troubles
Check Item
Carry out "Test Pattern Print" from the Service Program.
(See P.309)
Check if "Auto Bi-D Adjustment" is carried out
properly.
Carry out the function check of the Ink Mark Sensor.
P.330)
Check if it functions normally.
Print the following adjustment patterns to check if the
adjustment is correctly made.
CR Direction Head Slant Adjustment
PF Direction Head Slant Adjustment
1. Check if the paper type setting is proper.
2. Check the height of the Printhead. (See P.321)
it is within the specified range.
3. Check the position of the Paper Thickness Sensor.
P.369) Check if it is within the specified range.
If it is not correctly adjusted, carry out the
following adjustments.
Auto Bi-D Adjustment
Ink Mark Sensor check & adjustment
P.330)
(See
Replace the Ink Mark Sensor if the function check
shows trouble (See P.173).
If it is not correctly adjusted, carry out the
following adjustments.
CR Direction Head Slant Adjustment
(See P.336) P.336)
(See P.339) PF Direction Head Slant Adjustment
P.339)
1. Correct the paper type setting.
Check if
2. Adjust the values of check items in the left
column, if any of them is out of the specified
(See
range.
Revision A
Remedy
(See P.341)
(See
(See
(See
77
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