Apple Color LaserWriter 12/600 PS ation User Manual download pdf (Page 33)

95.08.23.11.29

Color LaserWriter 12/600 PS Basics & Theory 1–22

Outline of Major Circuit Boards

This section describes the functions of the DC controller board and the

mechanical controller board. See “Circuit Boards” in the Parts chapter

for additional information.

DC Controller

Board

This board controls the printer. When the

/PRNT signal is received from

the I/O controller, the DC controller sends the print sequence command

to the mechanical controller, which then starts controlling various

loads. The DC controller also provides

• Laser/scanner control

• Image stabilization control

• Fuser temperature control

• Power-off time measurement

• Various detection functions

• I/O interface control

Mechanical

Controller

Board

This board controls various loads in response to signals from the DC

controller board. The mechanical controller returns the status signals to

the DC controller. The mechanical controller controls the cassette

pickup board, the high-voltage power supply, and the sheet feeder

controller board via its serial communications. The mechanical

controller also provides

• Drive of various motors and fan motors

• Control of the toner carousel

• Control of the fuser assembly

• Control of the transfer drum and its peripheral assemblies

• Control of the cassette pickup board, the high-voltage power supply,

and the sheet feeder controller board

• Toner stirring function, toner-low detection, and toner cartridge

detection

• Photosensitive drum life detection

• Waste toner collection system control

• Energy-saving mode control

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Apple Color LaserWriter 12/600 PS ation User Manual Page 33