Low Image Density; Foggy Background - Minolta Di151 Service Manual

FrameMaker Ver.5.5E(PC) Di151 TROUBLESHOOTING
00.03.10
(3)

Low image density

Section Step
1 Toner has run out.
2 The image transfer current ter-
minal is dirty.
3 The Image Transfer Roller is
deteriorated.
4 The developing bias terminal
Engine
is dirty.
5 The Regulator Blade terminal
is dirty.
6 Image density is still low even
after the I/C has been
changed.
1 Wiring between the Scanner
and Control Board is con-
IR
nected.
(4)

Foggy background

Section Step
1 Extraneous light has entered
—
the copier.
1 PC Drum is contaminated with
foreign matter.
2 Drum charge voltage terminal
is dirty.
3 Regulator Blade terminal is
Engine
dirty.
4 Seal bias terminal is dirty.
5 Foggy background still occurs
even after the I/C has been
changed.
1 Mirrors and lens are dirty.
2 Exposure Lamp is dirty.
IR
3 Wiring between the Scanner
and Control Board is con-
nected.
Check Result
YES Change I/C.
YES Clean.
YES Change.
YES Clean.
YES Clean.
YES Change High Voltage Unit.
YES Change Scanner.
NO
Check Result
YES Protect copier from extrane-
YES Clean.
YES Clean.
YES Clean.
YES Clean.
YES Change High Voltage Unit.
YES Clean.
YES Clean.
YES Change Scanner.
NO
T-21
Action
Change PH Unit.
Change Master Board.
Change Control Board.
Connect.
Action
ous light.
Change PH Unit.
Change Master Board.
Change Control Board.
Connect.