T
echnical
B
ulletin
PAGE: 1/2
Reissued:16-Apr-14
Model:
Taurus-C1a/C1b (D074/D075)
Date:
07-Jun-13
No.:
RD074106a
RTB Reissue
The items in
bold italics
were corrected or added.
This bulletin provides supplementary information on how to prevent “mottled effect” along
with notes on maintenance of the image transfer rollers.
It has been discovered that the engine F/W with the software-limiter was not fully
effective in preventing SC44x (SC440-443: Image Transfer Power Pack Voltage
Leak). To completely prevent this SC, a new algorithm was added in the following
F/W.
Note that if the electrical conductivity of the image transfer rollers increases as a
result of a low-temp, low-humidity environment, lack of image transfer current may
cause the mottled effect.
Firmware
Copier
Printer
Engine
1.68:04 (D0745404Q) or newer
1.68:04 (M0445404N) or newer
Machine operation in low temperature and humidity environment increases the electrical
conductivity of image transfer rollers, which could cause SC44x (SC440 ~ 443: Image
Transfer Power Pack Voltage Leak) as reported from the field.
To counter SC44x, a software-limiter was added to the engine F/W described below, which
checks and controls the feedback and output voltages. The limiter, however, could cause
shortage in the image transfer current if the electrical conductivity increases due to
operational environment, resulting in mottled effect.
Software-limiter is included in the Engine F/W listed below.
Firmware
Copier
Printer
Engine
1.65:04 (D0745404M) or newer
1.65:04 (M0445404K) or newer
Subject:
Notes on image transfer roller maintenance to
prevent mottled effect
Prepared by:
H. Inenaga
From:
PP Tech Service Dept., 1st PP Tech Service Sect.
Classification:
Troubleshooting
Mechanical
Paper path
Product Safety
Part information
Electrical
Transmit/receive
Other (
)
Action required
Service manual revision
Retrofit information
Tier 2
