Canon imagePRESS 1135 Series Service Manual page 86

2
Technology > Image Formation System > Various Types of Control > Pre-exposure
Image Stabilization Control
Potential control Determine the laser ower and developing bias according to the
deterioration of the sensitiveness of the photosensitive drum
and environmental changes.
D-max control Measure the density of the image formed based on the result of
potential control and determine the laser power and developing
bias.
D-half control Measure the density of the image formed based on the result
of D-max control and determine the gradation correction value.
PASCAL control The control to determine gradation correction value executed
arbitrarily by the user.
Secondary transfer ATVC Determine the secondary transfer bias according to the
control changes in the resistance of the secondary transfer internal
roller.
Drum Control
Drum home position control Detect the home position of the photosensitive drum.
Drum heater control Warm up the photosensitive drum in a low-temperature
environment.
Toner Supply
Toner level detection Detect the toner level in the developing assembly and hopper
unit
Toner supply control Supply toner to the developing assembly and hopper unit
according to the toner level
Toner container detection Detect whether the toner container is attached to the machine
Waste toner feed
Waste toner feed control Transport the residual toner cllected by the drum cleaner an
ITB cleaner to the waste toner container.
Waste toner full detection Detect whether the waste toner level in the waste toner
container is full or not.
Waste toner container Detect whether the waste toner container is attached to the
detection machine or not.
2 Technology > Image Formation System > Various Types of Control > Pre-exposure
■ Pre-exposure
● Pre-exposure Control
Appy the light of the exposure LED to remove the rsidual charge remained on the
photosensitive drum surface and prevent uneven density.
Based on an instruction from the DC controller PCB, The pre-eposure LED unit lights the
LED1. The LED1 light is applied onto the photosensitive drum and removes the residual
charge remained on the photosensitive drum.
T-2-33
Process unit driver PCB (PCB52)
Pre-exposure LED (LED1)
2-38
F-2-47
2-38