Pre Exposure Led - Canon iR C6800 Series Service Manual

Chapter 7

7.5.5 Pre Exposure LED

0003-1043
The machine uses a pre exposure LED array to remove charges remaining on the photosensitive drum, thus
preventing uneven density in prints.The pre exposure LED array is arranged opposite the photosensitive drum, and
the LEDs are turned on during printing to remove residual changes from the drum surface and forming stable images.
The DC controller controls the pre exposure LED array drive signal (EXP_LED) to turn on and off the LED array.
The DC controller generates the following drive signal:
EXP_LED: if '0', the pre exposure LED array goes on. if '1', the pre exposure LED array goes off.
[1]
J1106-A7 EXP_LED
DC-CON
Drum
F-7-31
1 Pre exposure LED array
7-36