Xerox Phaser 7400

2-58 Phaser 7400 Color Printer Service Manual
HVPS
Located under the Transfer Unit and HVPS Cover, the HVPS supplies high-voltage to
the Transfer Unit and Imaging Units. The HVPS also provides connections for the
Front Door Interlock (CN3) that disables +24V when opened, the Waste Toner
Reservoir Full (CN4) and Detect (CN2) Hall-effect sensors.
HVPS Imaging Outputs
Output Voltage Purpose
CH -0.8 to -1.4kV Charge Roller voltage
DB -100 to -450V/250V Developer Roller voltage
SB -300 to -700V Sponge Roller voltage
BB Drop from SB Output with Zener Cleaning Blade voltage
TR 0 to 7kV Transfer Roller voltage (not shown)
Ground
Charge Roller
Drum
Sponge Roller
Developer Roller
s7400-337