2-26 Phaser 6121MFP Service Manual
Theory of Operation
4. To attract toner to the drum, a developing bias voltage (Vb) that includes both
DC (-) and + AC components is applied to the developing roller during
development. The AC component is applied only during development. The
developing bias voltage (Vb) supplied by the High Voltage Power Supply is
applied to the developing roller at the contact point shown below.
Developer Roller Drive
The Developer Roller is driven by the Developing Motor and intermediate gears.
s6121mfp-283
Bias Contact Point
s6121mfp-128
Intermediate Gear
Developing Roller
Developing Roller Drive Gear
Developing Motor (M3)
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