Ricoh Pro C901 Technical Bulletin page 422

Model:
Aries-P1.5/C1.5, AG-P1/C1, AGL-P1/C1
Subject:
Summary of development unit originating problems
- Toner degradation -
From:
PP Tech Service Dept., 1st PP Tech Service Sect.
Classification:
General
This bulletin summarizes the information announced in previously released RTBs for
image quality problems originating in the development unit and provides an explanation of
the differences between toner degradation and developer degradation along with the
correct actions required to avoid unneeded developer replacements, which in fact, often
take place without successful results due to misunderstanding toner degradation and
developer degradation.
How does toner degrade?
Toner degrades when fresh toner is not supplied to the development unit due to its low
consumption rate, which is caused by the following 3 factors:
Low image coverage ratio
Idling of C, M, Y development units when printing in B/W mode
Idling of the mainframe while optional devices are in operation
Fresh toner supplied proportionately
to the consumption rate
Toner consumed in print
operations
T
echnical
Troubleshooting
Mechanical
Paper path
Product Safety
Dev unit
Mixing applies
stress to the toner
B
ulletin
Date:
29-Nov-13
Prepared by:
Part information
Electrical
Transmit/receive
Other ( )
Toner
Silica (additive)
Degrading
process
Disintegrated
silica
Fresh
toner
PAGE: 1/3
No.:
RM077098
J. Kobayashi
Action required
Service manual revision
Retrofit information
Tier 2
Silica (additive)
Degraded
toner