Service manual

T- 7 7
(10) Smear on back
(11) Uneven image density
(12) Gradation reproduction failure
Section Step Check Result Action
Engine
1 Suction Belts are dirty. YES Clean.
2 Image Transfer Corona is dirty. YES Clean.
3 Image Transfer Guide Plate is
dirty.
NO Clean.
4 Pre-Fusing Guide Plate is
dirty.
YES Clean.
5 Fusing Rollers are dirty. YES Clean or change.
6 Toner spilled over area inside
copier.
YES Clean.
Section Step Check Result Action
Engine
1 PC Drum is properly
grounded.
NO Clean or change PC Drum
ground plate.
2 Comb Electrode and grid
mesh are dirty or deteriorated.
YES Clean or change.
3 Image Transfer Corona is dirty
or deteriorated.
YES Change.
4 Toner is even on Sleeve/Mag-
net Roller.
NO Adjust DB. (See ADJUST-
MENT.) Correct developer
conveying mechanism.
IR
1 Mirrors and lens are dirty. YES Clean.
2 Exposure Lamp is dirty or
deteriorated.
YES Clean or change.
Section Step Check Result Action
Engine
1 Wiring between PH Unit and
Image Processing Board is
connected.
YES Change PH Unit.
Change Image Processing
Board.
IR
1 Shading sheet is dirty. YES Clean.
2 Wiring between CCD Assy
and Image Processing Board
is connected.
YES Change CCD Assy.
Change Image Processing
Board.
NO Connect.