Ricoh FT4460, Руководство по обслуживанию, Страница: 91 / 413

28 February 1989
5.10 TONER END DETECTION (Black)
5.10.1 Black
When the black development unit is in use, the ID sensor detects toner end.
The system control PCB detects toner end when Vsp is continuously
detected at a level higher than 0.91V for more than five times. The Add Toner
indicator then blinks.
The process of the toner end detection is shown above.
When Vsp is found higher than 0.91V, the detection mode changes from once
every 10 to once ever 5 copies. Toner supply mode goes to 15% fixed supply.
If at the second check Vsp is still above 0.91V, the toner supply mode moves
up to 30%.
If at the third check still Vsp is still above 0.91V, toner supply moves up again
to 60%. If at the fourth check Vsp remains above 0.91V, toner supply stays at
60% for 5 move copy cycles.
If at the fifth check Vsp remains above 0.91V, the “Add Toner” indicator starts
blinking. 50 more copies can be made before the “Add Toner” indicator turns
on continuously and the Start key turns red.
When a new toner cartridge is added, the toner supply stays at 60% for 50
copies. The “Add Toner” indicator will go out.
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