Ricoh FT8680 Service Manual page 90

CLEANING
9.8 CLEANING BLADE SOLENOID CONTROL
Start Key
Cleaning
Sol.
Main F
Motor R
The main motor turns in reverse for 40 pulses at the end of every copy job. At
this time, the cleaning solenoid is kept on to clean off the toner on the
cleaning blade edge. When the drum temperature is more than 49°C [A], the
toner on the cleaning blade edge may soften and clog due to heat. To
prevent this, the cleaning blade is released from the drum at the start of the
drum reverse rotation. The blade touches the drum again while drum is still
turning in reverse (due to inertia) to clean the edge of the blade.
The cleaning solenoid off timing [B] is determined based on the accumulated
number of copies as follows:
Accumulated copy number
≥ 100 copies
< 100 copies
This is to minimize toner scattering in the machine.
The cleaning solenoid is turned off when the main switch is off or the front
doors are opened.
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[B]
Off Timing
15 seconds after the main motor off
5 minutes after the main motor off
2-66
31 July 1995
[A]
[B]
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