Service manual

EPSON Stylus Photo R340/350 Revision A
Troubleshooting Troubleshooting 33
• White bands/
Color
unevenness
Vertical bands (perpendicular to the CR
moving direction) appear on printouts
with inconsistencies in density.
(Note)
If the problem still occurs after the all
actions to remedy it have taken, replace
the CR Motor with a new one.
Print Head 1. Print a nozzle check pattern and examine the printout
patterns for any missing segments or broken lines.
1. Run a head cleaning and then print a nozzle
check pattern again. (See Chapter 3 for
details on the adjustments) If the problem still
occurs, replace the Print Head with a new
one.
Adjustment 1. If the problem occurs in the Bi-D mode, verify that the
Bi-D adjustment is made properly.
1. Perform the Bi-D adjustment to align the bi-
directional print positions. (See Chapter 3 for
details on the adjustments)
Carriage Unit/
CR Guide Shaft
1. Check the CR Guide Shaft surface for any foreign
matters.
1. Remove the foreign matters on the surface of
the CR Guide Shaft.
2. Check if the CR Guide Shaft is properly secured to the
Main Frame with the CR Shaft Fixing Spring.
2. Install the CR Guide Shaft correctly.
3. Check if the CR Guide Shaft surface is properly
lubricated.
3. Wipe off the remaining oil on the CR Guide
Shaft with a dry soft cloth, and re-lubricate
the shaft with G-63 oil. (See Chapter 4 for
details on the lubrication)
4. Check the CR Guide Shaft surface for any damages. 4. Replace the CR Guide Shaft with a new one.
EJ Frame Assy. 1. Check if the EJ Frame Assy. surface stays in a horizontal
position.
1. Replace the EJ Frame Assy. with a new one.
Horizontal bands (horizontal to the CR
moving direction) appear on printouts.
(Note)
If the problem still occurs after the all
actions to remedy it have taken, replace
the PF Motor with a new one.
Print Head 1. Print a nozzle check pattern and examine the printout
patterns for any missing segments or broken lines.
1. Run a head cleaning and then print a nozzle
check pattern again. (See Chapter 3 for
details on the adjustments) If the problem still
occurs, replace the Print Head with a new
one.
Printer driver and
Special paper
1. Check if appropriate type of paper is used in accordance
with the printer driver setting.
1. Use an appropriate type of paper in
accordance with the printer driver setting.
PF Roller Assy. 1. Check the PF Roller surface for any foreign matters. 1. Clean the surface of the PF Roller properly
with a soft cloth.
2. Check if the PF Roller Assy. is damaged. 2. Replace the PF Roller Assy. with a new one.
Table 1-14. Print Quality Problems (continued)
Problems Description Failed Part Check Point Remedies
CR Moving
Direction
CR Moving
Direction
PF Roller Assy.