Toshiba 353, 452, 453, 350 service manual Function of auto-toner sensor

12.4.2  Function of auto-toner sensor

(1)Function

a.Initialization adjustment function —At the first use of the equipment or when the developer ma- terial is replaced with a new one.

Automatically adjusts the output value of the auto-toner sensor responding to humidity (input value to the main CPU) for the toner density of the new developer material so that it stays in range of 2.35 to 2.45V.

b.Stabilizing the toner density —During the printing operation Maintains the toner density to a certain ratio as follows.

Toner is consumed.

→The toner density is lowered.

→Change in the auto-toner sensor output responding to humidity is detected. →The toner motor is driven.

→Toner is supplied from the toner cartridge to the developer unit.

c.Toner-empty detection and recovery:

Detects that there is no toner in the toner cartridge: The toner motor is driven.

→The auto-toner sensor output does not change. →The toner density does not change.

→It is determined there is no toner in the cartridge (toner empty).

Recovering from the toner-empty state: The toner motor is driven.

→Toner is supplied from toner cartridge. →The auto-toner sensor output changes. →The toner density returns to normal value. →The toner-empty state is cleared.

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