Process Control
D014/D015/D078/D079 6-34 SM
6.8.2 COMPONENTS USED DURING PROCESS CONTROL
Potential Sensor
1 Potential Sensor PP Max. output: -1000V
2 Drawer Connector Connection point for PCU
3 Potential Sensor Probe Mounted in the copier (not in PCU)
4 Charge Roller Y,M,C PCU. K PCU has a corona unit.
5 OPC Drum Surface potential: -900V max.
6 Transfer Roller 1.5kV (normal use), 5kV (transfer)
7 Development Roller Range: -350 to -800V dc
There is a potential sensor mounted in the copier above the surface of the drum in each
PCU. Each potential sensor consists of a probe and small power pack. A drawer connector
connects the probe and the power pack as shown above.
The potential sensor measures the potential of the drum immediately after it is charged by
the charge rollers in the Y,M,C PCUs and charge corona unit in the K PCU. It also
measures a series of patterns (undeveloped latent images) exposed on the drum by the
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