Ricoh FT5535 Service Manual page 470

CUSTOMER SERVICE GROUP
BULLETIN NUMBER:
APPLICABLE MODEL: FT5035/5535/4027/4527/4022/4522
SUBJECT: DIRTY BACKGROUND
SYMPTOM:
Dirty background associated with machines that are located in dusty environments.
CAUSE:
1. Concerning low copy volume machines:
The lamp voltage correction/compensation by the process control every 1K copies cannot catch up
with the lamp voltage level necessary to eliminate the dirty background.
2. Concerning high copy volume machines:
The lamp voltage increases to the maximum level and the voltage cannot rise high enough to create
the light intensity necessary to eliminate the dirty background.
SOLUTION:
1. A new SP Mode has been incorporated so that the process control interval can be changed
depending on the environmental conditions in which the copier is installed. The adjustment levels f or
the new SP Mode are as follows.
2. Optics Filters have been registered as service parts for machines which are located in dusty
environments. These filters are designed to prevent dust from entering the optics cavity. The
installation procedure for the Optics Filters is on page 2.
3. In dusty environments, the Exposure Lamp should be cleaned at the same time as the mirrors and
lens. If there is no improvement, replace the exposure lamp.
Part Numbers:
• ROM - A1535120
• Optics Filter Set (Left & Right) - A1539515
TECHNICAL SERVICE BULLETIN
4027/4527/5035/5535/4022/4522 - 029REISSUE
SP3-801
0: OFF
1: Process Control Cycle is performed every 1K copies (Default)
2: Process Control Cycle is performed every 500 copies
3: Process Control Cycle is performed every 200 copies
04/14/97
Continued...