Cleaning Solenoid Circuit - Ricoh FT4430 Service Manual

CLEANING SOLENOID CIRCUIT

When the Start key is pressed or the main switch is turned on, the CPU sends
a LOW signal to CN206-A24. This signal energizes the cleaning solenoid.
Fifteen minutes after the main motor turns off, this signal becomes HIGH
again, turning off the solenoid. This releases the cleaning blade from the
drum. When the cleaning blade is released, the edge of the blade is cleaned.
The fifteen minute delay for the release of the cleaning blade is to avoid toner
scattering. Toner scattering is increased if the cleaning blade is released too
frequently.
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16 April '88