Ricoh FT4460, Service Manual, Page: 112 / 413

28 February 1989
8.4 TONER OVERFLOW DETECTION
The toner overflow sensor [A] sends the overflow signal to the I/O control
PCB when the toner collection tank [C] is full. This sensor is a photo interrup-
ter.
A rubber sheet [B] under the toner overflow sensor is lifted up by the gradual
collection of toner. Once full, the actuator moves into the photointerruptor.
Up to 250 copies can be made after the CPU detects the overflow condition.
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