Ricoh A229 Service Manual page 585

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SUBJECT: DIRTY BACKGROUND AT THE LEADING EDGE OF COPY
SYMPTOM:
Some toner is slightly visible at the leading edge of the copy.
CAUSE:
Overtoning in the Development Unit.
SOLUTION:
Field Countermeasure:
Follow the flow chart for the adjustment procedure on the following pages to minimize the symptom.
Please note that since this adjustment is to stabilize the toner amount in the development unit at a lower
level, some customers may complain about a lighter image in the black solid areas. Especially, soon after
installation and for the first several copies every morning. However, there is no problem with text area.
Adjust the SP modes for the development bias to meet a required level for each customer.
Production Countermeasure:
To minimize the dirty background, the factory settings of some SP modes have been changed to stabilize the
toner amount in the development unit at a lower level, which prevents overtoning.
Because of the change of the factory settings of some SP modes, a lighter image may appear on black solid
areas at installation.
The toner amount in the development unit is determined with a calculation including not only new toner but
also recycled toner. At installation, the pipe for the recycled toner is empty and it takes approximately 1,000
to 2,000 copies for the recycled toner to migrate into the development unit.
This means that the toner amount in the development unit is less during the first 1,000 to 2,000 copies after
installation and gradually becomes higher.
Please adjust the SP modes for the development bias to meet a required level for each customer.
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