Service manual

7-59
CHAPTER 7 TROUBLESHOOTING PROCEDURES
(2) Background is dirty (Fig. B on page 7-57)
(2-1)Background is dirty (partly)
Drum exposed to light
Leak of toner
Offset toner of fuser unit
Confirmation Tasks
Check to see if the ID unit has been left in an
environment where its surface was exposed to light for
a long time.
Check to see if toner is leaking from the ID unit or
toner cartridge.
Check to see if the fuser unit has offset toner from the
previous print job sticking.
Action at NG
Replace the ID unit.
To use a new ID
unit on a trial basis,
use FUSE KEEP
MODE of the
System Maintenance
Menu.
Replace the ID unit
or toner cartridge.
To use a new ID
unit on a trial basis,
use FUSE KEEP
MODE of the
System Maintenance
Menu.
Repeat idle printing
by using waste
medium, until the
offset toner is
exhausted to the
print medium. Or,
replace the fuser
unit.
Confirmation Items
(2-1-1) ID unit
(2-1-2) Fuser unit
(2-2)Background is dirty (totally)
Type of medium
ID unit terminal
Confirmation Tasks
Check to see if an especially thin medium is used for printing.
Ensure visually that the high-voltage terminal of the ID unit is
properly in contact with the contact ASSY (see Figure 7-3).
Action at NG
Use the prescribed
paper.
Replace the ID unit or
modify the high-
voltage terminal. To
use a new ID unit on a
trial basis, use FUSE
KEEP MODE of the
System Maintenance
Confirmation Items
(2-2-1) Print medium
(2-2-2) High-voltage terminal