Apple Color LaserWriter 12/600 PS ation User Manual download pdf (Page 107)

95.08.23.11.30

Color LaserWriter 12/600 PS Basics & Theory 1–96

Overhead Transparency Detection

When you use overhead transparency material for this printer, you must

use the type with a white band at its leading edge. The printer makes

the following determinations by measuring the period that the paper

leading-edge sensor (PS303) is interrupted by this band:

• Whether it is the correct type of transparency, another type of trans-

parency, or paper

• Whether it is placed with the proper side up

• Whether it is placed with the proper edge leading

Note: The band and arrows on the left side of the transparency are not

used in this printer. All markings disappear during the fusing stage.

If any nondedicated transparency is used or the dedicated transparency

sheet is placed incorrectly in the tray, the mechanical controller will

notify the DC controller, which will stop the printer and notify the I/O

controller of a nondedicated transparency jam.

The paper leading-edge sensor is a reﬂective type sensor. In order to

prevent sensor malfunction due to LED deterioration, the printer

detects the intensity of light emitted by the LED during the initial rota-

tions. The cassette pickup board sets the detection level based on the

intensity detected. The emission level of the LED of the sensor is

changed in two steps using the LED power select signal (

LEDDRV). If it

detects that the intensity is low due to the deterioration of the LED,

IC301 will change the

LEDDRV signal to increase the intensity.

Feed Direction

White Band

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Apple Color LaserWriter 12/600 PS ation User Manual Page 107