Ricoh B246 SERIES, Manual, Page: 246 / 268

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Web Unit Drive
„
Web motor: Drives the
web cleaning unit
„
Near-end: SP 1902 004
determines when to
issue the near-end alert
(default: after 80%
used)
„
Web end sensor:
Detects when the web
has all been used up
„
Lifetime: About 300K
copies
Service manual, section 6.12.4
ˆ
The main points are on the slide.
ˆ
The web motor turns on every 15 seconds during copying (this can be changed with SP
1902 002 if the fusing unit is not being cleaned enough).
¾
The location of the motor is shown by the red circle on the left of the diagram.
Unfortunately, the motor itself is not shown.
¾
The length of time that the motor turns on is determined automatically by the
machine. It will be between 0.8 s and 2.8 s.
The diameter of the web remaining on the take-up roller changes with time, as
the web is used up. The machine estimates the current diameter of the roller
when determining how long to keep the motor on.
¾
The motor can also be switched on after each job, if SP 1903 001 is turned on. This
may be necessary if a lot of paper dust is sticking to the fusing unit rollers.
If this feature is on, the motor will run if the job is longer than the time specified by
SP 1903 002, and will run for the time specified by SP 1903 003. Again, the
actual time depends on the current roller/web diameter; the SP is just a
multiplication factor.
ˆ
Web near end is determined by adding up how much time the web motor has operated
since a new roll was installed. When the machine determines that there is less than a
certain amount left on the roll, then a near-end alert is issued.
¾
This means that if you install a partially used web instead of a new one, you have to
estimate how much has been used, and input it into SP 1902 001 (when installing a
new web, this SP must be reset to 0).
¾
The near-end threshold can be adjusted with SP 1902 004. The default is when 80%
of the web has been used.
ˆ
The service manual describes the web end sensor mechanism.
ˆ
The theoretical lift of the web is about 330 K. However, the web should be changed at PM,
which is at 300 K.