Apple Color LaserWriter 12/600 PS ation User Manual download pdf (Page 112)

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Color LaserWriter 12/600 PS Basics & Theory 1–101

When the paper cued at the paper leading-edge sensor (PS303) begins

feeding, the gripper drive signal (

GRIPON) goes “H” and the gripper

drive solenoid (SL4) is turned on to open the gripper on the transfer

drum. The paper is then fed 1.3 times faster than the transfer drum

speed so that its leading edge will be pushed into the opened gripper.

When the leading edge of the paper reaches the gripper, SL4 is turned

off and then the gripper is closed to clamp the paper top.

Simultaneously, the attraction roller press signal (

/ATTSLON) turns “L”

and the attraction roller press solenoid (SL6) is turned on when the

separation claw drive signal (

SEPON) goes “H” in order to actuate the

press cam to press the attraction roller against the transfer drum.

Attraction roller voltage is applied to the attraction roller while the

paper is passing through it. This gives negative electric charge to the

surface of the transfer drum and thus the paper is electrostatically

attracted by that surface.

After toner transfer, SL4 is turned on to open the gripper. The separa-

tion claw drive solenoid (SL5) is also turned on to actuate the separa-

tion claw. The paper is separated from the transfer drum and then fed to

the fuser assembly.

If the paper fails to reach or pass through each sensor within the speci-

ﬁed time, the CPU on the DC controller determines that a jam has

occurred and notiﬁes the I/O controller.

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Apple Color LaserWriter 12/600 PS ation User Manual Page 112