Symptom; Possible Cause; Countermeasures; Incorrect Color Registration - Ricoh G157 Service Manual

IMAGE QUALITY

4.4.17 INCORRECT COLOR REGISTRATION

Symptom

Incorrect color registration is seen between
the two colors.

Possible Cause

1) OPC belt error.
2) The OPC belt fails to keep the
regular and correct rotation because
of the impact caused when the toner
cartridge contacts the OPC belt.
3) Transfer belt error.
4) The transfer belt fails to keep the
regular and correct rotation because
of the impact caused when the
transfer roller contacts the transfer
belt.

Countermeasures

1) Check that the transfer roller unit is correctly installed.
2) Check that the transfer-belt cleaning unit is correctly installed.
3) Replace the OPC belt unit.
4) Replace the transfer belt unit.

4.4.18 MOTTLING

Symptom
The image density varies.
Possible Cause
1) The rear cover is not in place.
2) The transfer roller is incorrectly
installed.
3) The THV output of Power supply unit
is not correct.
4) Failure in the development unit.
5) Damage of the print paper.
Countermeasures
1) Check that the rear cover is correctly locked.
2) Replace the papers with new papers.
3) Replace the development unit.
4) Check that the transfer roller unit is correctly installed.
5) Replace the high voltage unit.
G157 4-32
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