Atdc Sensor - Minolta Di350 Service Manual

FrameMaker Ver.5.5E(PC) Di350 GENERAL, MECHANICAL/ELECTRICAL
98.12.18
1171SBM1303A

13-3. ATDC Sensor

• The ATDC Sensor automatic adjustment is made when a new I/C is installed in the
copier. 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 copier. Dur-
ing this sequence, the copier 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 read-
ings, the copier provides the following controls.
T/C Ratio (%)
More than 19
14 to 19
13 to 14
12 to 13
10 to 12
7 to 10
Less than 7
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 Replen-
ishing 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.
Sampling Data (V)
Less than 1.41
2.32 to 1.41
2.50 to 2.32
2.68 to 2.50
3.10 to 2.68
3.92 to 3.10
More than 3.92
Defective ATDC Sensor
Toner replenished for 0 msec.
Toner replenished for 54 msec. at intervals of
approx. 1 sec.
Toner replenished for 150 msec. at intervals of
approx. 1 sec.
Toner replenished for 378 msec. at intervals of
approx. 500 msec.
Passed onto the T/C recovery mode.
Defective ATDC Sensor
M-28
Control Details