6.6.3 Toner End Detection
The toner end sensor (which is a piezoelectric sensor) [A] detects whether
there is sufficient toner in the toner supply unit or not.
When there is not much toner inside the toner supply unit, the pressure of
toner on the toner end sensor becomes low and the sensor outputs a low
signal (0V); this is the low toner condition. When this condition is detected
five times, the toner bottle is turned for 2 seconds to add toner.
While the toner bottle is being turned to add toner, the CPU counts the total
toner supply clutch on time since the low toner condition was first detected. If
the toner end sensor is still outputting a low signal when the total clutch on
time reaches one minute, the Add Toner indicator starts blinking, and the
machine enters the toner near-end condition.
Fifty copies are allowed after entering the toner near-end condition. After
this, the machine enters the toner end condition and copying is disabled.
When the main switch is turned off and on, or the front door is opened and
closed, the machine drives the toner supply mechanism and monitors the
toner end sensor output. (The toner supply mechanism will be driven for a
maximum of 10 seconds.) If the toner end sensor outputs a high signal (5V),
the toner end condition is canceled.
The toner end sensor surface is cleaned by the movement of the spring [B]
attached to the agitator shaft.
[A]
[B]
A156/A160/A162 2-60 STM
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