2-4 Phaser 6121MFP Service Manual
Theory of Operation
6. Transfer Roller Cleaning
The residual toner left on the surface of the Transfer Roller is removed by an
alternating DC charge that transfers the waste toner back to the Transfer Belt
for collection by the Transfer Belt cleaning blade.
7. Transfer Belt Cleaning
A charge is applied to the Transfer Belt. By potential difference, residual toner
on the surface of the Transfer Belt is collected for cleaning. The toner scraped
off the surface of the photo conductor is collected in the Imaging Unit.
8. Fusing
Toner is permanently fused to the paper by the combination of heat and
pressure applied by the Fuser.
System Control
The following diagram shows the major operating components and their basic
connection to each other.
Transfer Belt
2nd Transfer Roller
s6121mfp-106
s6121mfp-280
Engine Control Board
Image Processor Board
CPU
Control Panel
Scanner
TC/Y TC/KTC/CTC/M
Image Processing
Fusing
Image Process
Paper Pick-Up/
Transport
Laser Unit
Image Bus Line
Control System Line
FAX
Power Supply/
High Voltage
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