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TECHNICAL SERVICE BULLETIN
BULLETIN NUMBER: D095/M077/D095+/M077+ – 048 07/19/2013
APPLICABLE MODEL:
GESTETNER – PRO C901s/PRO C901/PRO C901s GA+/PRO C901 GA+
LANIER – PRO C901s/PRO C901/PRO C901s GA+/PRO C901 GA+
RICOH – PRO C901s/PRO C901/PRO C901s GA+/PRO C901 GA+
SAVIN – PRO C901s/PRO C901/PRO C901s GA+/PRO C901 GA+
SUBJECT: MINIMIZE IDLING OF DEVELOPMENT UNITS
GENERAL:
This bulletin provides information on the developer mixture degradation that occurs in the Y, M and C
Development Units, which is caused by the idling operation of these units. If poor image quality is confirmed
as a result of degraded developer mixture, modify the SP setting as described below, which will minimize the
idling operation of the Y, M and C Development Units.
Why is this important?
• Idling of the Development Unit (= no toner consumption) affects the characteristics of both toner and
carrier and degrades the developer mixture, resulting in poor image quality.
• Poor image quality leads to customer dissatisfaction as well as high service costs generated from
frequent developer replacements.
• Developer yield is highly dependent on the drive distance of the components in the Development
Unit. Idling without consuming any toner not only degrades the developer, but will also shorten the
life of the developer.
Why Y, M and C?
Y, M and C Development Units tend to idle more than the Bk Development Unit. This is because, by default,
these units are designed to continuously run idle even when the printing mode switches to mono-chrome
from full-color. Y, M and C Development Units remain inactive only if printed in mono-chrome mode
throughout the entire operation, from startup to stand-by.
SP MODIFICATION:
To minimize the idling operation of Y, M and C Development Units, modify the following SP value as
described below.
Enter the following SP and change the value from “0” (default) to “10”.
ACS Switch Set: FC
Mode: Cont Bk
Image N Sheets
SP Default
SP 2-907-001 0 10
Number of sheets
printed in FC before
switching to Bk mode
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Copyright © 2013 RICOH Americas Corporation. All rights reserved. Page 1 of 2
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Tech Service Bulletin No. D095/M077/D095+/M077+ – 048
SIDE EFFECT:
Productivity will slightly decrease because it will take approximately 5 seconds to switch from FC mode to
mono-chrome mode, and approximately 7 seconds in the reverse order. Also, it will take an extra 2~3
minutes to perform Process Control if turning ON the machine power or resuming operation after a long
pause in low temperature environment.
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