Lexmark Optra ep, Service Manual

Page: 65 / 143

4026-0XX
Diagnostic Information 2-43
Toner on backside of printed page
Note: Toner on the back of the printed page can be caused by poor
fusing, improper development, or incorrect charging.
2 Toner Car-
tridge Replace the toner cartridge if the cartridge is
nearing the end of life.
3 Transfer
Assembly Check the transfer roll for toner buildup and con-
tamination. Clean the transfer roll by performing
POST two or three times.
Light print or black vertical streaks can be
caused by an open transfer leakage current cir-
cuit. Check the transfer roll right side contact,
TFR board lead and the TFR Leakage board
(PWB-T) for damage or poor contact.
If light print is still a problem, replace the follow-
ing FRUs one at a time in the order shown:
HVPS
Transfer Assembly
TFR Leakage board PWB-T
Engine board
FRU Action
1 Fuser Assem-
bly Check the hot roll and backup roll for toner
buildup. Clean or replace as necessary.
If the fuser assembly is clean and functioning
correctly, replace the following FRUs one at a
time in the order shown:
HVPS
Engine board
FRU Action