Service manual

T- 7 4
(3) Low image density
(4) Foggy background
(5) High image density
Section Step Check Result Action
Engine
1 Image Transfer Corona is dirty. YES Clean or change.
2 Wiring between HV and Image
Transfer Corona is connected.
NO Connect.
3 Developing bias contact is
dirty or deformed.
YES Clean or change.
4 PH lens is dirty. YES Clean.
5 Wiring between HV and devel-
oping bias is connected.
NO Connect.
6 ATDC Sensor gain value is
correct.
NO Re-input.
IR
1 Shading position is correct. NO Correct IR shading position.
(See ADJUSTMENT.)
Section Step Check Result Action
—
1 Extraneous light entered
copier.
YES Protect copier from extrane-
ous light.
Engine
1 Cleaning Blade is dirty with
foreign matter and paper dust.
YES Clean or change.
2 PC Drum is dirty with foreign
matter.
YES Clean or change.
3 Sleeve/Magnet Roller is dirty. YES Clean.
4 Developing bias contact is
dirty or deformed.
YES Clean or change.
5 Main Erase Lamp is dirty. YES Clean.
IR 1 Mirrors and lens are dirty. YES Clean.
Section Step Check Result Action
Engine
1 Image Transfer Corona is dirty. YES Clean or change.
2 Wiring between HV and Image
Transfer Corona is connected.
NO Connect.
3 Developing bias contact is
dirty or deformed.
YES Clean or change.
4 Wiring between HV and devel-
oping bias is connected.
NO Connect.
5 ATDC Sensor gain value is
correct.
NO Re-input.
IR
1 Shading position is correct. NO Correct IR shading position.
(See ADJUSTMENT.)