Specifications

2-28
2.4.9.3 ATDC Sensor
•
The ATDC Sensor automatic adjustment is made when a new I/C is installed in the machine. Toner
replenishing control is thereafter controlled as detailed in the following.
1. ATDC Sensor Automatic Adjustment
•
The ATDC Sensor is automatically adjusted when a new I/C is loaded in the machine. During this
sequence, the machine reads the sensor output value and sets it as the reference.
This reference value is stored in memory and used until the I/C reaches its service life.
2. Toner Replenishing Control
•
While the I/C Motor is turning, the ATDC Sensor samples T/C and, according to the readings, the
machine provides the following controls.
T/C Ratio (%) Sampling Data (V) Control Details
More than 19 Less than 1.41 Defective ATDC Sensor
14 to 19 2.32 to 1.41 Toner replenished for 0 msec.
13 to 14 2.50 to 2.32
Toner replenished for 54 msec. at intervals of approx.
1 sec.
12 to 13 2.68 to 2.50
Toner replenished for 150 msec. at intervals of
approx. 1 sec.
10 to 12 3.10 to 2.68
Toner replenished for 378 msec. at intervals of
approx. 500 msec.
7 to 10 3.92 to 3.10 Passed onto the T/C recovery mode.
Less than 7 More than 3.92 Defective ATDC Sensor
✽
Toner replenishment represents the operation of the Sub Hopper Toner Replenishing Motor.
3. Toner Empty Control (T/C Recovery Mode)
•
When the control is passed onto the T/C recovery mode, the Sub Hopper Toner Replenishing Motor is
energized to replenish the supply of toner into the Developing Unit and, if T/C is recovered to a level of
14% or higher (2.32V or less) within 150 sec., it resets the toner-empty condition.