High-voltage power supply functional check:

The high-voltage power supply assembly provides the necessary voltages for the printer’s
electrophotographic processes. The +24 B VDC supply is used to power the high-voltage power
supply assembly.

High voltage system checks

Are the connectors for the primary charge
roller, drum ground, developing bias, and
toner level sensor damaged, corroded,
contaminated, or missing?

1. Inspect and correct each item.
2. Check the toner cartridge.
3. Check all wire connections.
4. Replace the engine controller board if
   the connection cannot be repaired.
   Are the high-voltage power supply
   connections contaminated, bent, or
   broken?
5. Clean the terminals with alcohol only.
6. Check all wire connections.
7. Replace the engine controller board if
   the connection cannot be repaired.
   Is the internal toner cartridge damaged? Replace the toner cartridge.