Gestetner G060 Service Manual page 921

BULLETIN NUMBER:
APPLICABLE MODEL:
GESTETNER – DSC38
RICOH – AP3800C
SAVIN – SLP38C
SUBJECT: TONER END MIS-DETECTION
SYMPTOM:
Toner end might be detected even when some amount of toner still remains in the toner cartridge.
CAUSE:
Because of the shape of the toner cartridge, toner may accumulate on the sloping area of the cartridge and
not be supplied properly. This causes a toner end to be detected with toner still remaining in the cartridge.
FIELD COUNTERMEASURE:
Opening and closing the top right cover or reinserting the toner cartridge may recover the toner end
condition due to false detection. This causes toner that may have accumulated on the sloping surface of
the cartridge to fall into the supply area. In addition to these changes, remind customers to try removing
and reinstalling the toner bottle if there is toner remaining in the bottle. This is mentioned in the Operating
Instructions (Maintenance Guide 1, Replacing the Toner Cartridge).
PRODUCTION COUNTERMEASURE:
The following two modifications have been applied to minimize misdetection of Toner End conditions.
1. Engine firmware
The toner supply control has been changed in Version B1.15E.
Old
The air pump motor is turned on for
1 second to agitate the toner in the
cartridge, and then the toner supply
clutch is turned on for a calculated
interval to feed the required amount
of toner.
2. Toner cartridges
Modification
Strips of Mylar have been attached to the
inner package to prevent the package from
bending or becoming dented.
Note: Applied to all toner colors.
The shape of black toner package has been
changed to create a steeper slope in the
area circled in the illustration, allowing the
toner to flow more easily.
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Copyright 2002 RICOH Corporation. All rights reserved.
TECHNICAL SERVICE BULLETIN
G060/G570 – 014
The air pump motor and toner supply clutch are turned on for 1
second each until the required amount of toner has been fed into
the development unit. This ensures that the toner is kept in a
constant fluid state in toner supply mode.
Cut-in
August, '01
April, '02
10/09/2002
New