Sharp AR-M355U Service Manual page 57

C. Operational descriptions
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.
Separation electrode
-1.8KV
-800V
25 A 45ppm
19 A 31/35ppm
MAX 5KV
200M
Separation operation
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.
Separation electrode
-1.8KV
-800V
25 A 45ppm
19 A 31/35ppm
MAX 5KV
200M
AR-M351U/M451U, AR-M355U/M455U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 13
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.
Separation electrode
-1.8KV
-800V
25 A 45ppm
19 A 31/35ppm
MAX 5KV
200M
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:
CLEANING
WARMING UP
However, the cleaning voltage is not applied during warm up
after completion of SIM.
2) After completion of a print job
PRINTING Job
3) After printing 100 sheets (during 1 job)
1sec
PRINTING (100 Sheets) CLEANING
READY CONDITION
1sec
CLEANING
1sec
PRINTING (100 Sheets) CLEANING