NEC Super Script 4400 Maintenance Manual page 245

23. White Print - Blank page (no print at all) is outputted or specific color is missing (not printed)
Main Causes
1. Laser light path is blocked by paper or other material stuck at opening of optical unit.
2. Transfer Solenoid is not functioning.
3. There is no belt bias voltage (CBV) injected.
4. There is no output from the high voltage unit (HVU).
Fusing Unit
Transfer Unit
Paper Discharger Unit
Transfer Roller
Transfer Drum
Paper Feeding Roller
Countermeasures
1. Ensure that there are no foreign particles stuck in the opening of optical unit.
2. Replace the transfer solenoid with a new solenoid. (See Chapter 7)
3. Replace the photoconductor belt module with a new unit. (See Chapter 6)
4. Replace the high voltage unit (HVU) with a new unit. (See Chapter 7)
236 SuperScript 4400 — Maintenance Guide
Drum Cleaner
OPC Belt Cartridge
Laser Path
Toner Cartridge
(K,Y,M,C)
K
Y
M
C
Optical Unit
Paper Cassette