Symptom; Possible Cause; Countermeasures; White Band - Ricoh G157 Service Manual

IMAGE QUALITY

4.4.13 WHITE BAND

Symptom

A horizontal white band appears.

Possible Cause

1) Deformation of the transfer roller.
2) Contact failure of the transfer roller's
bias terminal.
3) Failure of the paper transfer clutch.

Countermeasures

1) Replace the transfer roller unit.
2) Check the transfer roller's bias
terminal.
3) Check the paper transfer clutch and
cam structure.

4.4.14 TONER DROP

Symptom
Irregular dot images appear.
Possible Cause
1) Toner drops on the transfer belt
because of the failure of the waste
toner auger.
a) Mylar of the waste toner auger is
damaged.
b) Waste toner is not correctly
collected by the waste toner
auger.
2) Toner adhering to the development
roller drops on the OPC belt.
Countermeasures
1) Check the cleaning brush and the waste toner path.
a) Clean the perimeter of the transfer-belt cleaning unit.
b) Check the seal on the transfer-belt cleaning unit. Replace the transfer-
belt cleaning unit if necessary.
c) Check the waste toner path. If waste toner stays, remove it with a
vacuum cleaner.
2) Clean or replace the development unit.
G157 4-30
G157T913.TIFF
G157T914.TIFF
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