2-32 Phaser 6128MFP Service Manual
Theory of Operation
Interlock Switch
The Interlock Switch is a switch that interrupts the supply of +24 VDC power to the
HVPS or Motor upon the opening of the Front Cover.
Toner Access Door Switch
A switch that detects when the Toner Access Door is open.
GFI Breaker
Opens to shut off the AC power if it detects any voltage or current or leakage
current that exceeds the rating of the AC power supply.
Data Flow
The electrical signal flow for the print data from the printer I/P Board is shown in
the following diagram.
Host (Electric Signal)
Electronic Sub-system Control Board (Electric Signal)
Machine Control Unit (Electric Signal)
Laser Unit (Laser Beams)
Electrostatic Latent On Drum (Invisible Image)
Toner Image On Drum
Toner Image On Paper
Print Image On Paper
s6128-034
Computer
I/P Board
MCU Board
Laser Unit
Imaging Unit
Imaging Unit
Transfer Belt
Fuser
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