Additional Notes About Fusing Cleaning Unit Operation; Calculating Cleaning Fabric Service Life - Ricoh B234 Service Manual

FUSING

Additional Notes about Fusing Cleaning Unit Operation

• Opening either front door (or both doors) shuts down operation of the fusing
fabric unit.
• When the fusing temperature reaches the temperature 10°C below the
temperature where the hot roller starts to idle, the fabric take-up operation
executes twice.
• When the fabric motor operates while the hot roller is idling. After the hot roller
starts to idle, the fabric motor turns on at 10 sec. intervals up to a maximum of 10
times.
• The fusing fabric unit shuts down completely when the machine is turned off with
the main power switch.
• When the operation power switch is pressed to turn on the machine, the fusing
fabric unit starts to operate as soon as the hot roller starts to idle. The fabric
motor rotates the take-up roller at 10 sec. intervals up to a maximum of 10 times.
• When the operation power switch is pressed to turn the machine off, the fabric
take-up roller turns on/off twice. However, this does not occur if the fusing
temperature when the machine is turned off is 10°C less than the temperature
set for hot roller idling to start.
• When the machine enters auto off mode, the fabric take-up motor turns on/off
twice. However, this does not occur if the fusing temperature when the machine
is turned off is 10°C less than the temperature set for hot roller idling to start.

Calculating Cleaning Fabric Service Life

The fusing cleaning fabric is a roll of heat-resistant fabric 24 m log saturated with
silicone oil. It is mounted on a supply roller and take-up roller. The part of the
cleaning fabric that touches the hot roller both lubricates and removes paper dust
and other particles from the surface of the hot roller.
At prescribed intervals, the fabric motor (a dc motor) switches on and rotates the
take-up roller. This feeds a fresh portion of the fabric from the supply roller to clean
and lubricate the surface of the hot roller.
The job time sensor (a photo-sensor) measures the length of time that it takes for
all the sheets of each job to pass.
• The job time sensor is on when there is no paper present.
• It turns off when it detects the leading edge of the first sheet of a job, and at that
time, the machine starts to measure the job time.
• At 2 sec after the trailing edge of the last sheet of the job passes below the
sensor, the machine stops measuring the job time.
• The length of the job is then added to the accumulated count for the cleaning
fabric.
• When this calculated total equals the time prescribed for the service life of the
cleaning fabric, the machine issues the fusing fabric near-end alert.
B234/B235/B236/D101/D102/D103 6-160 SM