Toshiba DP1600 Service Handbook page 197

(15) Background Fogging
Step Cause/Defect area
1 Density reproduction
2 Main charger
3 Process unit (developer)
4 Process unit (drum)
5 HVPS (main charger/
developer bias/
transfer charger
6
December 2000 © TOSHIBA TEC
Check items
Image density reproduction de-
fect?
Main charger dirty?
Magnetic roller pressure mecha-
nism working normally?
Film formed on drum surface?
High-voltage output defective?
If problem persists after measures
are applied, or there is no prob-
lem found in above check, follow
procedure described in right col-
umn.
4 - 73
01/11
Measures
Adjust density.
Clean main charger wire, replace process unit
or charger wire (SRU type).
Check mechanism.
If problem persists, replace process unit or
drum (SRU type).
Note: Never touch drum surface.
Adjust output from HVPS, or replace defec-
tive HVPS.
Replace process unit.
1600/2000/2500 TROUBLESHOOTING