Details Of Image Stabilization Controls - Minolta EP3010 Manual

1173SBM0703A
7-3.

Details of Image Stabilization Controls

1. AIDC Sensor adjustment
2. Grid voltage and T/C correction
• The following are the details of each image stabilization control.
1-1. AIDC Sensor coarse adjustment
This adjustment represents a coarse adjustment of the AIDC Sensor when the ordinary
control of only the LED current cannot cover part-to-part variations in the AIDC Sensor
(installation, circuit, deterioration, etc.). The surface of the PC Drum whose charges have
been neutralized is exposed to light from the LED. The output current from the AIDC Sen-
sor goes through the load resistance selected by a 4-bit analog switch and the 4-bit analog
switch selects the load resistance so that the resultant voltage becomes 1V or less.
1-2. AIDC Sensor fine adjustment
If the AIDC Sensor is dirty with toner, it results in an error being produced in the sensor out-
put voltage value, providing a false reference value. The surface of the PC Drum which has
been erased is exposed to light from the LED. The LED current value is varied through
pulse width control so that the output voltage from the AIDC Sensor becomes 1V.
Controlled Part
AIDC Sensor
2. Grid voltage and T/C correction
The Image Erase Lamp produces a solid-black pattern on the surface of the PC Drum and
the AIDC Sensor reads the pattern. The grid voltage is then varied so that the output from
the AIDC Sensor remains a given level or higher, which ensures that the toner-to-carrier
ratio on the surface of the PC Drum becomes constant.
If an even greater solid-black density is required when the upper control limit of the grid volt-
age has already been reached, the target control value of T/C is raised in 0.5% steps up to
7%, thus terminating the adjustment sequence.
Grid Voltage
3. Optimum Exposure Lamp voltage
correction
4. AE Sensor gain adjustment
Output Signal ON
PJ8A-7 Pulse output
Control Value
550 to 790V
M-15
OFF WIRING DIAGRAM
1 Step Initial Value
30V
4-F
550V