Read Sharp AR-810 (serv.man15) Service Manual online
AR-651/810 DRUM/CLEANER UNIT 11 - 2
11. 2. Functions
(1) Drum cleaning blade
It is pushed to the drum with a certain pressure by a weight and scrapes off the residual toner on the
drum surface. The pressure is released and the blade is separated from the drum by turning the cam
manually.
(2) Drum recovery blade
It catches the toner scraped by the drum cleaning blade.
(3) Recovered toner transport auger
It transports the scraped toner to the recycle unit.
(4) Drum separation finger
It is pushed to the drum by a solenoid only when the leading edge of the paper passes in order to
separate the paper which has not been separated by the transfer belt.
(5) Image quality sensor
It assesses the relative reflective rate for the test pattern (toner image) formed on the drum in order to
keep the image density and line width properly.
(6) Drum thermistor
Since the charging amount changes depending on the temperature of the drum surface, the drum
thermistor detects the temperature of the drum surface and controls to unify the charging amount.
(7) Drum cleaning brush
It eliminates the paper dusts and extraneous substance adhered to the drum surface after separating
the paper and also decrease the friction of the drum cleaning blade to lengthen its life span, which
improves the image reliability.
11. 3. Drum Temperature Detection Circuit
Drum temperature detection circuit
At this detection circuit, the voltage gained by the R33 and thermistor is input into the A/D converter of
IC 58 to detect the drum surface temperature.
R33
+5V
C186
R32
IC58
Main
CPU
Thermistor
Click on the first or last page to see other AR-810 (serv.man15) service manuals if exist.