Table of Contents
Advertisement
BULLETIN NUMBER:
APPLICABLE MODEL: FT6645/6655
SUBJECT: ELECTRICAL MALFUNCTION DUE TO ELECTRICAL NOISE
SYMPTOM:
1. The scanner overruns home position and hits the optic frame.
2. During a copy cycle, the exposure lamp turns off suddenly, the scanner stops and the copy paper stops
in the fusing unit. A partially black solid image sometimes appears on the copy paper because the
exposure lamp turns off during the copy process.
3. When the paper is removed from the fusing unit after the above mentioned (item #2), a paper jam
occurs and the selected copy modes are cleared.
4. The erase lamp turns on at the wrong time and in the wrong position resulting in partially void images.
CAUSE:
Normally, there is minor arcing between the transfer belt and the OPC drum. Periodically, electrical noise
which is caused by this arcing affects the 5V lines. This noise is transmitted to the main control board
resulting in an electrical malfunction. This occurs most often just after a new transfer belt is installed in the
machine, when the electrical resistance of the transfer belt is at its lowest level (after 100~200 copies, the
electrical resistance of the transfer belt stabilizes).
TEMPORARY COUNTERMEASURE:
Four (4) Ferrite Cores (16070478) have been added (see Installation Procedure on page 2).
UNITS AFFECTED:
All FT6645/6655 copiers manufactured after Serial Number A3354470001 and A3364460001 respectively
will have the Ferrite Cores installed during production.
ORDERING PROCEDURE:
Ricoh Corporation will automatically ship four (4) Ferrite Cores for use on 100% of all FT6645/6655 copiers
manufactured prior to Serial Number A3354470001 and A3364460001 respectively based on Ricoh's
Equipment Shipped Records.
6645/6655/6665-031
Arcing occurs here
12/13/94
Continued...
Advertisement
Table of Contents
