Transfer - Brother DPC-8060 Service Manual

3. The laser beams reflected by the reflection mirror go straight toward the exposure drum below
it, then expose the exposure drum.

3.2.5.3 Transfer

(1) Transfer process
After the drum has been charged and exposed, and has received a developed image, the toner
formed is transferred onto the paper by applying a negative charge to the back of the paper.
The negative charge applied to the paper causes the positively charged toner to leave the drum,
and adhere to the paper. As a result, the image is visible on the paper.
(2) Cleaning process of transfer roller
If the toner is not transferred onto the paper perfectly it is possible that there may be residual
toner on the drum which will adhere to the transfer roller. The transfer roller voltage changes
to a positive voltage during non-printing rotation of the drum. Therefore the transfer roller is
cleaned by returning the positively charged toner adhering to the transfer roller onto the
exposure drum.
Surface
potential (V)
1
+900
+400
+100
Drum
sleeve 0
1 Cycle of drum
2 3
(a)
(b)
Time
Fig. 3-25
3 -2 3
Primary charging
1
2 Laser beam exposure and developing
(a) Unexposed area
(Non image area)
(b) Exposed area
(Image area)
Transfer the image to paper
3
Confidential