Low Image Density; Foggy Background; High Image Density - Minolta Di450 Service Manual

(3)

Low image density

Section Step
1 Image Transfer Corona is dirty.
2 Wiring between HV and Image
Transfer Corona is connected.
3 Developing bias contact is
dirty or deformed.
Engine
4 PH lens is dirty.
5 Wiring between HV and devel-
oping bias is connected.
6 ATDC Sensor gain value is
correct.
1 Shading position is correct.
IR
(4)

Foggy background

Section Step
1 Extraneous light entered
—
copier.
1 Cleaning Blade is dirty with
foreign matter and paper dust.
2 PC Drum is dirty with foreign
matter.
Engine
3 Sleeve/Magnet Roller is dirty.
4 Developing bias contact is
dirty or deformed.
5 Main Erase Lamp is dirty.
IR 1 Mirrors and lens are dirty.
(5)

High image density

Section Step
1 Image Transfer Corona is dirty.
2 Wiring between HV and Image
Transfer Corona is connected.
3 Developing bias contact is
Engine dirty or deformed.
4 Wiring between HV and devel-
oping bias is connected.
5 ATDC Sensor gain value is
correct.
1 Shading position is correct.
IR
Check Result
Check Result
Check Result
T-74
Action
YES Clean or change.
NO Connect.
YES Clean or change.
YES Clean.
NO Connect.
NO Re-input.
NO Correct IR shading position.
(See ADJUSTMENT.)
Action
YES Protect copier from extrane-
ous light.
YES Clean or change.
YES Clean or change.
YES Clean.
YES Clean or change.
YES Clean.
YES Clean.
Action
YES Clean or change.
NO Connect.
YES Clean or change.
NO Connect.
NO Re-input.
NO Correct IR shading position.
(See ADJUSTMENT.)