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Technical Bulletin UTAX
UTAX
CLP 3721
CLP 3726
TA
TA
CLP 4721
CLP 4726
TB 09 / Firmware Upgrade (ENGINE 006.002)
2KT-B387-B411/M
Date: 21-11-2011
T
OPIC
:
The firmware is upgraded as follows.
C
ONTENT OF CHANGES
:
Fan control optimization.
The right side fan (for PWB cooling) is not stopped at Sleep. - Therefore, this is corrected.
Corrective measures for the drum ghost image due to residing potential.
Change for the main charge adjustment: The primary transfer current is adjusted in conjunction with the MC setting of 1 to 5 in the service
menu.
Corrective measures for the color shift due to cleaning failure at the calibration.
The color shift may occur if cleaning failure occurs with the color adjustment reference pattern on the primary transfer belt. - Therefore,
this is corrected.
Change: Cleaning bias to the cleaning fur brush at the calibration is changed from 2microA to 8microA.
Toner consumption optimization.
The drum protection control is reviewed and its control table is changed to optimize the toner disposal at the normal operating
environment.
After the above change of the drum protection control table, conductive compound may adhere at the gap between the main charger roller
and the drum and white streaks in the drum circle interval if the machine is left 2 hours or more at high temperature and high humidity.
Therefore, preventive control for the white streaks is implemented.
FIRMWARE
Program No. Ver. Remarks
MAIN
2KV_3F00.002.005
002.005 New (CLP 3721, CLP 3726 / CLP 4721, CLP 4726)
ENGINE
2KT_1000.006.002
006.002 New (CLP 3721 / CLP 4721)
ENGINE
2KV_1000.006.002
006.002 New (CLP 3726 / CLP 4726)
Classification:
Entire Stock Rework
In-Field modification at next visit
X
In-Field modification by case
No modification necessary
Field Measure:
Please upgrade the firmware when the phenomena arise.
Serial Nos.:
CLP 3721 / CLP 4721
CLP 3726 / CLP 4726
Planned in October 2011 production
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