Symptom; Possible Cause; Countermeasures; Black Line - Ricoh G157 Service Manual

IMAGE QUALITY

4.4.9 BLACK LINE

Symptom

A fine black line appears.

Possible Cause

1) The doctor blade in the development
unit is damaged.
2) The OPC belt surface is damaged.
3) Unwanted particles (paper dust, etc.)
stay in between the cleaning blade
and the OPC belt.
4) Unwanted particles bond to the perimeter parts of the OPC belt and the
transfer belt. Then they contact the toner image formed on the belt.

Countermeasures

1) Replace the development unit.
2) Replace the OPC belt unit.
3) Clean the perimeter of the mounting area of the OPC belt and the transfer
belt.

4.4.10 VERTICAL LINE

Symptom
A vertical line appears.
Possible Cause
1) Unwanted particles (dust, etc.) bond
to the parts near the OPC belt and
the transfer belt. Then they contact
the toner image formed on the belt
surface.
Countermeasures
1) Clean the stain on the OPC belt unit.
2) Clean the stain on the transfer belt.
3) Remove the transfer unit cleaning
unit. Then clean the inside and
outside of the waste toner feeder.
G157 4-28
G157T909.TIFF
G157T910.TIFF
SM