Phaser 7500 Printer Service Manual 2-49
Theory of Operation
Main LVPS (PL18.1.11)
The Main LVPS generates +24VDC and +5VDC voltages from the AC power source
to supply the components that require the power.
HVPS (1st/ 2nd/ DTS) (PL6.2.9)
The HVPS supplies high voltage to the 1st BTR of each color in the IBT Belt Unit, as
well as to the 2nd BTR and Detack Saw in the 2nd BTR Assembly.
HVPS (Deve/ BCR) (PL18.1.7)
The HVPS (Deve/ BCR) supplies high voltage to the BCR in the Imaging Units of
each color, as well as to the Magnet Roll in the Developer Housing Assembly of
each color.
Backplane (BP) PWB (PL18.3.2)
The Backplane PWB acts as a connection between the MCU PWB and the Image
Processor Board.
Image Processor (ESS) PWB (PL35.1.3)
The Image Processor PWB is the Printer Controller. The I/P Board performs
conversion of print data input from a network or USB port, and communicates with
the computer.
Main Power Switch Chassis Assembly (PL18.1.1)
The Main Power Switch Chassis Assembly is the Main Switch that controls the
power supply.
GFI (PL18.1.15)
The GFI consists of the AC power supply inlet and the breaker for preventing
overvoltage.
Front Cover Interlock Switch (PL18.1.9)
The Front Cover Interlock Switch detects the Open/ Close state of Front Cover.
Opening the Front Cover cuts off the DC power supply (+24 VDC) to the printer.
IBT Front Cover Switch (PL18.1.10)
The IBT Front Cover Switch detects the Open/ Close state of Front Cover.
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