Pre-Exposure; Figure 5-3 Pre-Exposing The Photoconductive Belt - Tektronix PHASER 560 Service Manual

5
Theory of Operation

Pre-exposure

5-6 Phaser 560 Color Printer
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The print process begins when the photoconductive belt passes by the
pre-exposure lamp. The belt is moving at a speed of 96 mm-per-second for
600 dpi printing or 48 mm-per-second for 1200 dpi printing. The light of the
pre-exposure lamp, which is a horizontal row of red LEDs, removes random
negative charges from the photoconductive belt. Before pre-exposure, the
surface of the belt varies from -500 volts to +50 volts. Following pre-exposure,
the voltage level of the illuminated portion of the belt only varies from 0 to -50
volts. The pre-exposure lamp is sometimes called the erase lamp since it
"erases" negative charges from the belt.
Pre-exposure
lamp
Light from the
pre-exposure
lamp's (erase
lamp's) LEDs
removes
negative charges
from the belt.

Figure 5-3 Pre-exposing the photoconductive belt

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Photoconductive
belt
9013-13