15 February 2006 DRUM UNIT
6-51
Detailed
Descriptions
6.8 DRUM UNIT
6.8.1 OVERVIEW
1. Quenching Lamp
2. Charge Corona Unit
3. Toner Recycling Pipe
4. Drum Potential Sensor
5. OPC Drum
6. Pick-off Pawls
7. Pick-off Pawl Spurs
8. ID Sensor
9. Toner Collection Coil
10. Pressure Release Filter
11. Cleaning Brush
12. Cleaning Blade
13. PTL (Pre-Transfer Lamp)
The OPC drum (diameter 100 mm) is charged by the charge corona unit, a
standard Scorotron grid wire charging and cleaning system.
The drum motor drives the drum and the drum cleaning unit. A counter blade
system, with both cleaning blade and brush, clean the drum.
Two sensors mounted near the drum, an ID sensor and potential sensor, are used
for process control.
Toner is collected at the cleaning area and transported back to the development
unit via the toner collection coil and toner recycling pipe.
B140 Series
The PTL removes the charge on the drum. This makes better paper separation.
Also, with the PTL, pawl marks do not occur on the leading edges of copies. The
PTL only operates when the machine prints on plain or translucent paper. (☛6.8.4)
B246D907.WMF
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12
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13 (B140 Series only)
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