THEORY GUIDE Scan/Erase
10DEC05
TG4825-1
Page
78 of 120
The signals from the 2 SENSORS are continually monitored by the SLOW SCAN
CONTROLLER BOARD A6, and the power to the COIL BOARD A7 is decreased or
increased to provide smooth rotation and continual speed.
20,000 counts of the ENCODER make one rotation of the LEAD SCREW. The system moves
to each of the following positions until it reaches the correct number of counts:
• start of scan
• erase
• end of scan
ERASE AY
The ERASE AY includes 5 pairs of high-
intensity ERASE LAMPS that expose the
scanned SCREEN to white light. This
operation releases any residual charge on
the SCREEN.
H177_1244GC
OTOR
LOW SCAN
PLATE
ERASE LAMPS
H177_1244GCB
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