Toner Cartridge - Ricoh FT8680 Service Manual

TONER DENSITY DETECTION AND SUPPLY 31 July 1995

7.4 TONER CARTRIDGE

[A]
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[B]
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When the toner cartridge is set, the toner cartridge sensor [A] is de-actuated.
The main PCB monitors the toner cartridge sensor signal and detects if the
cartridge is replaced at the toner end condition. The main PCB inhibits
copying if there is no toner cartridge.
The toner cartridge is also used as the used toner collection tank. The copy
image becomes poor if the collected toner is re- used. To prevent accidental
re-used of the collected toner, a spring plate lock mechanism [B] is installed.
The lock allows the toner cartridge shutter to be pulled and returned only
once.
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