Epson EPL-5500 Service Manual page 118

EPL-5500 Service Manual
5.4.2 Print Quality Anomalies
This section describes how to isolate possible causes of a print quality problem .
Symptom Possible Cause
Low image density Poor development PWB-F board
Image
problem
Defective PC drum Photoconduc-
Improper
density setting
Foggy background Poor development Toner cartridge —
Improper charging Drum charge
Improper
density setting
Rev. B
Table 5-28. Print Quality Anomalies
Part Name
transfer Image transfer
unit
PWB-F board
tor unit
print —
print —
Check Item
—
Check to see if the
surface of image
transfer unit is
damaged.
—
—
—
—
Check the wiring of the
PC drum charging bias
line.
—
Troubleshooting
Remedy
Replace the PWB-F
board.
Replace the image
transfer unit.
Replace the PWB-F
board.
Replace the
photoconductor unit.
Adjust the print density
using printer settings.
Replace the toner
cartridge.
Replace the PWB-F
board.
Replace the
photoconductor unit.
Adjust the print density
in printer settings.
5-17