Epson C11CA88001A1 Service Manual

Epson Stylus Pro 4900/Epson Stylus Pro 4910 Revision A
TROUBLE SHOOTING Remedies for Print Quality Troubles 78
Confidential
Horizontal bandings (black/white lines or
uneven color) can be seen.
The print setting is not proper.
Check the paper type setting screen.
 Check if the paper type setting is proper.
 Check if the low print quality mode is selected.
1. Correct the paper type setting.
2. Select a higher print quality mode.
The printhead has not been adjusted
properly.
Print the following adjustment patterns to check if the
adjustment is correctly made.
 CR Direction Head Slant Adjustment (See P.336)
 PF Direction Head Slant Adjustment (See P.339)
If it is not correctly adjusted, carry out the
following adjustments.
 CR Direction Head Slant Adjustment (See
P.336)
 PF Direction Head Slant Adjustment (See
P.339)
The paper feed amount is not proper.
Check if the Media Feed Correction Check & Adjustment
are made properly (See P.373).
 Check if it is in the specified range.
Carry out the adjustment if it is out of the specified
range. (See P.373)
Adjustment failure of the PG
1. Check the PG of the Printhead. (See P.321) Check if it is
within the specified range.
2. Check the position of the Paper Thickness Sensor. (See
P.369) Check if it is within the specified range.
Carry out the following adjustments if it is out of
the specified range.
 PG Height Check & Adjustment (See P.321)
 Paper Thickness Sensor Position Adjustment
(See P.369)
PF Scale/PF Encoder cannot be
encoded properly.
Carry out “PF Encoder and Scale Check”. (See P.368)
 Check if the PF Scale is damaged or contaminated.
 Check if the PF Scale is not skewed.
 Check if the PF Encoder is installed correctly.
1. Re-attach any parts with trouble (See P.183)(See
P.184).
2. Clean the PF Scale with ethanol if it is
contaminated.
3. Replace it if it is damaged. (See P.183)(See
P.184)
The tension of the PF Timing Belt is not
proper.
Measure the tension of the PF Timing Belt to check if it is
in the specified range. (See P.366)
Carry out “PF Belt Adjustment” if it is out of the
specified range. (See P.366)
Adjustment failure of the PF Motor
Carry out Motor Measurement Adjustment for PF Motor
(See P.393).
If the printer does not recover from the error,
replace the PF Motor (See P.182).
Table 2-3. Print Quality Troubles
Symptom Cause Check Item Remedy

Epson C11CA88001A1 Specifications

General

Brand	Epson
Model	C11CA88001A1
Category	Printer
Language	English