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Reissued:31-May-13
Model:
Taurus-C1a/C1b (D074/D075)
RTB Reissue
The items in bold italics were corrected or added.
Subject:
Revised developer removal procedure
From:
PP Tech Service Dept., 1st PP Tech Service Sect.
Classification:
General
Replacing the developer without completely removing old developer causes the machine
to operate in a condition in which the applied toner density value is lower than the actual
value. This happens because the toner density sensor (TD sensor) initialization process
(SP3-030-001~006), which is performed when replacing the developer, always sets back
the toner density readings to the prescribed standard value 7.0% regardless of the actual
toner density, e.g. actual toner density could be 8% after replacing with fresh developer
but the TD sensor is calibrated to read this as 7%.
Continuous machine operation in this condition and incomplete developer replacement will
eventually cause the actual toner density to become too high and result in toner scattering.
This bulletin announces the procedures on how to remove old developer to prevent toner
scattering, in two parts.
Following are the expected effects:
Easier developer removal as a result of improved developer fluidity
Toner density will come close to the standard 7% after developer replacement
even if the dev unit is not completely cleared and contains a slight amount of
old developer.
PART 1: Preparations for Developer Removal
1. Before removing the developer, enter the SP mode and check the current toner density.
If the toner density is 7%±0.5, skip the rest of part 1 and go to PART 2.
If the toner density is not 7%±0.5 (7.5% or higher), continue this procedure.
T
echnical
Troubleshooting
Mechanical
Paper path
Product Safety
Table1 Toner density check SP
SP No.
SP 3-200-001
SP 3-200-002
SP 3-200-003
SP 3-200-004
B
ulletin
Date:
09-May-13
Prepared by:
Part information
Electrical
Transmit/receive
Other (
)
Color
K
C
M
Y
PAGE: 1/4
No.:
RD074102a
H. Inenaga
Action required
Service manual revision
Retrofit information
Tier 2
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