Service Manual

DEVELOPING UNIT
2-15
II UNIT EXPLANATION
2
4. DEVELOPING UNIT
4.1 Composition
*1 7145 only
Symbol Name Function or method
[1] TDS (Toner density sensor) Detection of toner density in the developing unit
L detection method
[2] Developing sleeve Coveyance of developing materials by magnetic force to the
drum surface
Two-component developing method (developing materials:
Toner + Carrier)
Developing bias voltage applied
Constant voltage DC output range: -350 to -830V
[3] Developing regulation plate Regulation of the spiking amount of developing materials on
the developing sleeve
Regulation plate method
[4] Agitator screw Agitation of developer and conveyance of developing materials
to the agitator wheel
Agitator wheel method
[5] Agitator wheel Agitation of developer and conveyance of developing materials
to the developing sleeve
4-vane wheel method
M1 Main motor Driving of the agitating turbine, the agitating screw and the
developing sleeve (except the 7145)
DC brushless motor, PLL control
M3*1 Developing motor Driving of the developing sleeve
7322ma2003e
CB
HV
M3
M1
CB
M1
[1]
[5][4]
[2][3]
7235/7228/7222
7145