Read Sharp MX-6500N / MX-7500N (serv.man27) Service Manual online
MX-7500N OPERATIONAL DESCRIPTIONS 13 – 39
B. Operational descriptions
(1)
Transfer
a. Transfer operation
a-1. Transfer operation
Toner images on the OPC drum are transferred to the primary
transfer belt by applying the positive high voltage to the primary
transfer roller.
transfer belt by applying the positive high voltage to the primary
transfer roller.
Negative charge is generated by the PTC unit, and this strengthens
negative charges on the transfer belt, improving the secondary
transfer efficiency.
negative charges on the transfer belt, improving the secondary
transfer efficiency.
By this operation, the transfer efficiency in the secondary transfer is
improved.
improved.
Then a high negative voltage is applied to the primary transfer belt
to transfer the toner images from the primary transfer belt to paper.
to transfer the toner images from the primary transfer belt to paper.
In the monochrome mode and the color mode, the black (K) trans-
fer voltage is selected.
fer voltage is selected.
a-2. Cleaning operation
Toner is cleaned by the secondary transfer cleaning blade, and
transported to the waste toner section.
transported to the waste toner section.
Unnecessary toner remained on the secondary transfer belt is
transferred to the primary transfer belt by making the polarity of the
applying voltage to the primary transfer belt. Then it is cleaned by
the primary transfer belt cleaning blade to be transported to the
waste toner section.
transferred to the primary transfer belt by making the polarity of the
applying voltage to the primary transfer belt. Then it is cleaned by
the primary transfer belt cleaning blade to be transported to the
waste toner section.
b. Primary (intermediate) transfer roller separation
mechanism and contents
The primary transfer roller operates pressing all the rollers, sepa-
rates all the rollers, or presses only black depending on the opera-
tion mode.
rates all the rollers, or presses only black depending on the opera-
tion mode.
When the roller separation clutch (1TURC) turns ON, the transfer
cam rotates to shift the primary transfer link and the primary trans-
fer arm linked with the cam in the arrow direction, performing sepa-
rating operation of the roller.
cam rotates to shift the primary transfer link and the primary trans-
fer arm linked with the cam in the arrow direction, performing sepa-
rating operation of the roller.
It also performs all pressing, all separating, or pressing only black
with the roller separation sensors (1TUD_CL, 1TUD_K) and the
separation detection arm.
with the roller separation sensors (1TUD_CL, 1TUD_K) and the
separation detection arm.
PTC
1TUD_CL
1TUD_BK
All pressing
ON
OFF
All separating
OFF
ON
Pressing only black
OFF
OFF
All separating
Pressing only black
All pressing
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