HP LaserJet Pro MFP M521 - Page 39

High-voltage power supply
The high-voltage power supply (HVPS) applies biases to the following components:
●
Primary charging roller
●
Developing roller
●
Transfer roller
●
Fusing film
Figure 1-14 High-voltage power supply
TR
PRI
DEV
FSRB
Engine controller unit
FILMB
To primary charging roller
To developing roller
Photosensitive drum
Transfer roller
High-voltage power supply
Primary
charging bias
circuit
Developing
bias circuit
Fuser
Fuser film
Pressure roller
Transfer bias
circuit
Fuser film bias
circuit
DC controller
Cartridge
ENWW
Engine-control system
23