Ricoh B051 Service Manual page 1163

BULLETIN NUMBER:
APPLICABLE MODEL:
GESTETNER – DSC224/DSC232
LANIER – LD024C/LD032C
RICOH – AFICIO 1224C/1232C
SAVIN – C2408/C3210
SUBJECT: TONER DROPPING
SYMPTOMS:
Toner dropping from the development unit, leading to the following:
Random-pitched banding (dirty OPC grounding brush)
Dirty spots on images
15mm-width bands (charge corona cleaner stops during cleaning job)
Uneven image density, light copies, other (see Technical Service Bulletin B051/B052-014 REISSUE
(05/24/2004))
CAUSES:
1. Toner leaks through the gap between the internal seal and doctor roller (L/R sides of development unit).
2. Toner leaks through the doctor and development roller NIP area, due to insufficient NIP pressure
between the rollers (L/R sides of development unit).
3. Toner leaks through the entrance seal when foreign particles get caught underneath the seal (center of
development unit).
NOTE: This is intermittent, since the development roller's reverse rotation mode helps to clear away these
particles.
SOLUTION:
Follow the steps below to resolve copy quality symptoms caused by toner dropping. Attach Field
Countermeasure seals to development units.
FIELD COUNTERMEASURE:
1. Turn the development roller in the reverse direction and clean the roller surface with a dry cloth. Also,
please refer to Technical Service Bulletin B051/B052-014 REISSUE (05/24/2004).
2. Clean the following, including any areas inside the machine onto which toner has fallen: Development
unit area, charge corona unit, PCU exterior, PCU grounding brush (see Technical Service Bulletin
B051/B052-014 REISSUE (05/24/2004), pg. 16).
If uneven image density or light copies still appear after this cleaning, check the LD unit (esp. toner shield
glass and polygonal mirror) and clean if necessary.
3. Clean both edges of the development unit (gears, development roller and development seals at both
ends).
Copyright  2004 RICOH Corporation. All rights reserved.
CÓPIA NÃO CONTROLADA
TECHNICAL SERVICE BULLETIN
B051/B052 – 042
CÓPIA NÃO CONTROLADA
07/14/2004
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