Canon i-SENSYS LBP5300 Series Service Manual page 59

Holder movement
a. Standard position
= All 4 transfer rollers
touch each drum.
b. Downward position
= One transfer roller(BK)
touches the drum
but the other 3 ones do not.
c. Upward psition
= All 4 transfer rollers
are away each drum.
<Detection of transfer rollers' position>
The position of the four transfer rollers can be detected in the same manner as description in the "Automatic bias control".
When the voltage is applied to Magenta and Black and the voltage value varied depending on the position of the M/Bk transfer rollers. There are only three
states available in the combinations;
(M, Bk) = (ON, ON), (OFF, ON), (OFF, OFF)
Note:
ON: engaged, OFF: disengaged
When the voltage value is obtained, the state out of above three can be hit since the values for the combinations are known in advance.
<Abnormal operation>
(1) Retry movement
If the condition of the magenta's transfer roller position is not changed, or a conflict of operation occurs, such as shifting to all four colors disengaged from
Transfer roller estrangement slide plate Slide plate movement
Slop 3
Pin
Transfer roller holder
Transfer roller
Bk
Photosensitive drum
Bk
Bk
F-2-30
Chapter 2
Slop 1
Slop 2
Y (C,M)
Y (C,M)
Y (C,M)
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