Symptom; Possible Cause; Countermeasures; White Spot / Black Spot - Ricoh G157 Service Manual

4.4.15 WHITE SPOT / BLACK SPOT

Symptom

A white spot or a black spot appears.

Possible Cause

1) Unwanted particles bond to the OPC
belt or the transfer belt.
2) The OPC belt or the transfer belt is
damaged.
3) Unwanted particles are mixed in the
toner.
4) Unwanted particles bond to the
transfer roller, or partial deformation of the transfer roller.

Countermeasures

1) Clean or replace the OPC belt unit.
2) Clean or replace the transfer roller unit. Replace the rear cover if necessary.
3) Replace the development unit.
4) Replace the transfer roller unit.

4.4.16 MIXED COLOR IMAGE

Symptom
A mixed color image appears.
Possible Cause
1) Retraction error of the development
unit.
2) Retraction error of the transfer roller.
3) Retraction error of the transfer-belt
cleaning unit.
Countermeasures
1) Check where the mixed color image
is caused.
a) If it is on the OPC belt, the cause
is the retract error of the toner
cartridge.
b) If it is on the transfer belt, the
cause is the retract error of the
transfer belt or cleaning roller.
2) Replace the spring clutch or the development solenoid.
3) Replace the transfer roller clutch.
4) Replace the transfer-belt cleaning solenoid.
SM 4-31
IMAGE QUALITY
G157T915.TIFF
G157T916.TIFF
G157