15 January 1992DEVELOPMENT
5.6 DEVELOPMENT COMPONENT CONTROL TIMING
1350
02001500200025003000(Pulse)
Timing Pulse
(1pulse=4msec)
Start Key
Main Motor
1857 1991
Non Image AreaImage AreaDevelopment
Bias
Toner Density Detection Cycles
1591
Development
Clutch Solenoid
When the Start key is pressed, the main motor starts rotating and the
development clutch solenoid is energized. At this time, the rotation from the
main motor is not transmitted to the rollers in the development unit. The
development clutch solenoid is de-energized about 1.8 seconds after the
Start key is pressed. At this time, the rollers in the development unit start
rotating.
When the Start key is pressed, the development bias circuit in the
CC/Grid/Bias power pack is energized to apply the negative voltage for the
non image areas to the development roller. The value of the bias voltage will
be different for the image areas. The shift to the image area bias voltage
occurs about 3.4 seconds after the Start key is pressed on normal copy
cycles. During on toner density detection cycles it occurs about 2.8 seconds
after the Start key is pressed. This is necessary since the value of the bias
voltage is also changed for toner density detection.
2-35 |
ACEC
