Sharp Z-21, Руководство по обслуживанию

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Step 6. Separation
The paper is negatively charged (About –3KV) by the discharge pin to
neutralize the potential, separating the paper from the drum.
Step 7. Cleaning
The residual toner remaining on the drum is collected by the cleaning
blade and carried into the toner collection unit.
Step 7. (same as step 1)
<Transition in the drum surface potential at each step>
Because of the developing bias, toner is not attracted to the non-
image areas of the drum surface. If, for any reason, the developing
bias fails, the toner will be attracted to the residual charge on the
drum producing background in the non-image areas.
Cleaning blabe
Residual toner
Toner
collection
unit
0
Drum
s
u
rf
a
c
e po
te
n
tia
l
White image
area
Canceled by
developing bias
Charge Exposure Developing Transfer
Discharge
Charge
Time
-600
Toner attract
potential
Residual potential (-80~100V)
-100
-150
-150V
Black image area
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