Apple Color LaserWriter 12/600 PS ation User Manual Page 160

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95.08.23.11.31
Color LaserWriter 12/600 PS Basics & Theory 1–149
Pickup/Feed System
Outline The sheet feeder pickup roller is driven by the sheet feeder motor (M6).
The sheet feeder motor is controlled by the sheet feeder motor driver IC
on the sheet feeder controller board. The cassette pickup solenoid is
controlled by the sheet feeder driver IC on the sheet feeder controller
board.
Pickup
Operation
When the print sequence command is received, the mechanical
controller in the printer rotates the main motor (M2). The sheet feeder
controller board in the sheet feeder rotates the sheet feeder motor (M6)
at high speed. Simultaneously, it turns the cassette feed solenoid
(SL351) on to rotate the sheet feeder pickup roller. Thus, paper is
picked up. After any multifed sheet is separated by the separation
roller, the paper is fed into the printer by the feed roller. The sheet
feeder controller board detects the paper leading edge with the pickup
sensor in the feeder, and changes the speed of the sheet feeder motor to
normal when the paper reaches feed roller 2 in the printer pickup block.
Thus, one sheet of paper is picked up from the cassette in the sheet
feeder.
The following table shows the settings of the cassette size-sensing
switches.
Detecting Jams Jams during the pickup and feed from the sheet feeder are detected in
the same manner as in the printer.
CSW3
ON
ON
ON
OFF
OFF
A4
B5
LTR
LGL
Cassette Absent
Cassette
CSW2
ON
OFF
OFF
OFF
OFF
CSW1
OFF
ON
OFF
ON
OFF
Cassette Size-Sensing Switch
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