Specifications

13-5. ATDC Sensor
<ATDC Sensor>
•
ATDC Sensor UN8 is installed at the center of the Developer
Conveying/Agitating Screw on the underside of the Developer Mixing
Chamber, over which all developer flows as it moves along a
figure-8-shaped path.
•
It detects the varying toner-to-carrier ratio (T/C) of the developer, which is
circulated through the chamber, as changes in the magnetic flux density.
The magnetic flux density is converted to a corresponding voltage value
which is applied to pin 80 of IC1A of Master Board PWB-A.
•
There is a cleaning mylar at the center of the Developer
Conveying/Agitating Screw. It ensures that fresh developer moves over
UN8 at all times, thus ensuring detection of accurate T/C.
<ATDC Sensor Automatic Adjustment>
Running an F8 operation will automatically adjust the output of the ATDC
Sensor.
Pin 4 of IC4A on PWB-A outputs an initial voltage to UN8 when an F8
operation is started.
The output voltage from UN8 is applied to pin 80 of IC1A.
IC1A checks to see if the voltage input to it is 2.5V.
The output voltage from pin 4
of IC4A is varied.
The voltage is decreased if the
input voltage is 2.5V or more.
The voltage is increased if the
input voltage is less than 2.5V.
The output voltage from pin 4 of IC4A
is fixed as the reference voltage.
The UN8 sensitivity is adjusted with
respect to the initial starter T/C of 5%.
YES
NO
1075C51MAA
M-75