Epson EPL-5900, Service Manual

Page: 108 / 181

EPSON EPL-5900/EPL-5900L Revision B
Troubleshooting Troubleshooting for Print Quality Problems 91
3.4 Troubleshooting for Print Quality Problems
If any print quality problem occurs, replace the imaging cartridge and the drum
cartridge first, and determine whether the problem is caused by a cartridge or caused by
the printer.
For a periodical print quality problem, measure the occurrence pitch (p) of the
abnormal image (x), and identify the abnormal component by referring to the table
below.
Figure 3-1. Pitch of Abnormal Print Image
3.4.1 All White
3.4.2 All Black
Table 3-9. Pitch of Abnormal Image and Possible Abnormal Component
Pitch
Possible Abnormal Component
(Diameter)
Component to be Replaced
28 mm Sleeve Roller (
φ
15.7 mm) Imaging Cartridge ( p.116)
94.2 mm OPC Drum (
φ
30 mm) Drum Cartridge ( p.116)
50.3 mm Transfer Roller (
φ
16 mm) Transfer Roller ( p.117)
62.8 mm Heat Roller (
φ
20 mm)
Fuser Unit ( p.125)
67.8 mm Backup Roller (
φ
21.6 mm)
Table 3-10. Print Quality Problem (All White)
Print Quality
Problem
Cause Remedy
No Imaging Cartridge Install the Imaging Cartridge.
No toner in Imaging
Cartridge
Replace the Imaging Cartridge.
No Drum Cartridge Install the Drum Cartridge.
Defective OPC Drum Replace the Drum Cartridge.
Abnormal laser emission
Replace print head. ( p.123)
Replace the high voltage unit (HV1).
( p.130)
Replace the Main Board Assy. ( p.120)
Improper transfer
Replace the transfer roller. ( p.117)
Replace the high voltage unit (HV1).
( p.130)
Replace the Main Board Assy. ( p.120)
Table 3-11. Print Quality Problem (All Black)
Print Quality
Problem
Cause Remedy
Abnormal laser emission
Replace print head. ( p.123)
Replace the Main Board Assy. ( p.120)
Abnormal charging
Replace the high voltage unit (HV1).
( p.130)
Replace the Main Board Assy. ( p.120)