EXP Computer C4077-90960 - Manual (Page 302)

Possible Cause Recommended Action
1. Defective toner cartridge. Replace the toner cartridge.
2. Light is leaking into the printer. Ensure all covers are in place.
3. High voltage contact springs are dirty or
defective. The high voltage contacts are
mounted on the High Voltage Power Supply
PCA and protrude into the toner cartridge cavity. Inspect and clean the high voltage contacts. If
damaged, replace the High Voltage Power
Supply PCA.
4. High voltage power supply circuit is defective
(not supplying the correct negative voltage). Replace the High Voltage Power Supply PCA.
5. DC Controller PCA is defective. If the DC
Controller turns on the laser beam continuously,
the entire surface of the Photosensitive drum is
neutralized causing a completely black page. Replace the DC Controller PCA.
6. Laser/Scanner Assembly is faulty (turning
laser on continuously). Replace the Laser/Scanner Assembly.
7. Connectors between the Laser/Scanner unit
and DC Controller are not seated properly or are
defective. Inspect and reseat the connectors. Replace
cables as necessary.
Table 7-7 Black Page
7
Troubleshooting
7-65