T
echnical
B
ulletin PAGE: 2/6
Model:
Aries-P1.5/C1.5, AG-P1/C1, AGL-P1/C1
Date:
29-Nov-13
No.:
RM077099
Cause 2: Drum scratches caused by insufficient lubrication
If the drum surface is not sufficiently lubricated, excess friction between the drum and
cleaning blade could cause the cleaning bade to flip (or bend) and scratch the drum.
Cause 3: Drum scratches caused by narrow PG
Another factor that causes drum scratches is a narrow PG (potential gap), in which the gap
between the development roller and drum is narrower than the specification. In this
condition, stress is applied to the developer in the development process because the
developer is forced to move through a narrow gap, generating excess electrical current
along with heat and pressure. As a result, developer adheres to the surface of the
development roller and toner accumulation continues, eventually scratching the drum.
Dev
roller
Drum
Base board
Development area
Developer
applies
Dev rolle
Scratches are
generated on the
drum surface.
As toner adhesion
progresses toner
piles up higher on
certain areas.
Toner adhesion
Toner
adhesion
progresses.
Standard PG
Narrow PG
Development area
Development area
Drum
Base board
Developer
applies
pressure to the
dev roller.
Dev roller
PG
PG
Cleaning blade
Lubricant brush roller
Lubricant bar
Drum
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