Ricoh G081, Service Manual

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PRINT PROCESS
G081/G092 6-16 SM
Toner end detection
Toner detection mirror 1 [D] reflects light emitted from the LED [E]. If there is only a
small amount of toner remaining in the toner cartridge [C] some of the light passes
through the toner cartridge [A] and is reflected by the detection mirror 2 [B], the
light is then detected by the receptor [F]. A small “wiper” is incorporated in each
toner cartridge that will “clean” the inside of the toner cartridge in the area where
the LED light passes through. This ensures that the light is not blocked by toner
adhering to the inside of the toner cartridge when the cartridge is out of toner and
momentarily interrupts the LED light path
After the receptor has detected this pulsing light, the machine starts to count pixels.
When 0.26-billion pixels have been printed, “Toner is Almost Empty: Xxxxxx” is
displayed (where “Xxxxxx” indicates the color).
When 1.17-billion pixels have been printed, “Add Toner Xxxxxx” is displayed and
the machine stops printing.
If all three color toners are empty, the machine will continue to print in monochrome.
The machine will not print if the monochrome toner cartridge is empty even if the
color cartridges contain toner.
NOTE: 0.26-billion pixels are equivalent to 154 sheets of A4/LT paper (at 5%
coverage); 1.17-billion pixels are equivalent to 695 sheets of A4/LT paper
(at 5% coverage).