Toner Image Transfer; Transfer Belt Cleaning - Sharp AR-M550N Service Manual

: Feb. 6 2004
1
C. Operational descriptions

1) Toner image transfer

Toner images formed on the drum by the developing roller are trans-
ferred to paper by the transfer belt.
Toner on the drum is negatively charged by stirring in the developing
unit. By applying a positive voltage to the transfer roller, the transfer
belt and paper on the transfer belt are positively charged to transfer
negatively charged toner images to paper.
1
Cleaning roller
cleaning mode
-2.0kv
Cleaning roller
Transfer mode
cleaning mode
AC4.5kv
1.0 - 1.5kv (35µA)
-100v
(AR-M550N/U, AR-M620N/U)
2.0 - 2.5kv (40µA)
(AR-M700N/U)

2) Transfer belt cleaning

During the job, a positive voltage is applied to the transfer cleaning
roller so that negatively charged toner on the transfer belt is attracted
to the cleaning roller.
(The brush on the back of the transfer belt is provided for increasing
the cleaning effect.)
1
-2.0kv 2.0kv
Transfer belt
cleaning mode
2.0kv
8
10 Ω
AR-M550/M620/M700 DETAILS OF EACH SECTION 6 - 83
After completion of the job, the applied voltage to the transfer cleaning
roller is switched to negative, and toner is returned from the transfer
cleaning roller to the transfer belt, and toner on the transfer belt is
attracted to the drum and cleaned by the cleaning blade.
1
-2.0kv 2.0kv
AC4.5kv
1.0 - 1.5kv (35µA)
-100v
(AR-M550N/U, AR-M620N/U)
2.0 - 2.5kv (40µA)
(AR-M700N/U)
Cleaning timing:
• After completion of the job
• When warming-up
• After canceling a jam
• After execution of process control
3) Transfer belt separation/contact
Transfer belt is separated by the transfer separation motor.
The transfer belt is in contact with the drum except for the following
cases:
• When executing process control (to prevent against breakage of
toner patch on the drum)
• When a jam occurs (Protection of the drum, left door open/close)
• When shipping (Protection of the drum. Separate with the simulation
6-1 (7).)
8
10 Ω