AR-M351U, AR-M451U (serv.man11). Maintenance details of following sections, 1-Process - Sharp Copying Equipment Service Manual (repair manual). Page 10

AR-M351U/M451U, AR-M355U/M455U  MAINTENANCE AND DETAILS OF EACH SECTION  7 - 13

1) Toner image transfer

Toner images formed on the drum by the developing roller are
transferred to paper by the transfer roller.

Toner on the drum is negatively charged by stirring in the
developing unit. By applying a positive voltage to the transfer
roller, the transfer roller and paper on the transfer roller are
positively charged to transfer negatively charged toner images
to paper.

Since paper with toner images transferred on it is positively
charged, a high negative voltage is applied to the separation elec-
trode to separate the paper from the drum.

2) Transfer roller cleaning

After completion of the job, the applied voltage to the transfer
roller is switched to negative in order to attract toner from the
transfer roller to the OPC drum, cleaning the drum with the
cleaning blade.

The transfer cleaning voltage and the developing positive bias are
applied to the OPC drum at the timing shown below so that
remaining toner on the transfer roller is attracted again to the OPC
drum, performing cleaning.

1) When the power is turned on:

∗

However, the cleaning voltage is not applied during warm up
after completion of SIM.

2) After completion of a print job

3) After printing 100 sheets (during 1 job)

200M

-1.8KV

Separation electrode

25   A  45ppm
19   A  31/35ppm
MAX 5KV

-800V

200M

-1.8KV

Separation electrode

25   A  45ppm
19   A  31/35ppm
MAX 5KV

-800V

200M

-1.8KV

Separation electrode

25   A  45ppm
19   A  31/35ppm
MAX 5KV

-800V

CLEANING

READY CONDITION

WARMING UP

PRINTING Job

CLEANING

1sec

PRINTING (100 Sheets)

PRINTING (100 Sheets)

CLEANING

1sec

CLEANING

1sec