Functional Diagram - Sharp SF-7300 Service Manual

SF-7300
SF-7350
Step 7: Transfer (Transfer corona unit)
The cqy paper is charged to a hgher potentialthan the drum sur-
face by means of a negaWe transfercorona unit, a strongerattrac-
tion exists appears between the copy paper and the toner than b-
tween the drum and the toner. So the toner ia drawn from the drum
to paper.
Toner transfer efficiencyis between 70 to 8070, 20 to 30Y0 remains
on the drum.
Aluminium
layer
+++++
CGL — ".. .. . . .. ~ .'
cn —
OPC drum
Toner
J
Copy
paper
/
I
~ Transfer corona unk
1,
Step 8: Cleaning
The toner remaining on the drum sudace is removed by means of
the cfaaning bbde. The waste toner is then deposited in the waste
toner -tainer usingthe waste toner carryingshaft.
Blade
C~ CGL Aluminiumlayer
Step 9: Dl=harge
By exposing the drum sudace to the dbcharge lamp, postive and
negative charges appear in the CGL. The negative charge
produced in the CGL advances toward the residualpos~tie charge
in the aluminium layer, whik the poaitive ch~e advances in the
aluminumtowd the restiud negahe charge on the drum surface.
In this way, the poaitfvecharge and the negatie charge neutralhe
each other on the drum surface and in the aluminiumlayer.
This causes the drum surface potentialto approachOVORS m
Discha~e lamp
\ Lght ~
Residual
Aluminiu
al &arge
C. Transition of drum surface potential
OPC dmm,
A
D.
Functional diagram