THEORY GUIDE Scan/Erase
10DEC05
TG4825-1
Page
72 of 120
The EXTRACTION BAR has 5 vertical positions.
Position of the
EXTRACTION BAR
Description
Reference position Position of the EXTRACTION BAR when the REFERENCE SENSOR
S9 is blocked. The REFERENCE SENSOR S9 is installed at this
position during manufacture. This position is not the same for all CR
825/850 SYSTEMS.
When the system is initialized, the EXTRACTION BAR checks for the
REFERENCE SENSOR S9. Once it is located, the EXTRACTION
BAR moves up to the home position 1. The EXTRACTION BAR
remains at the home position 1 until the start of a new cycle.
Home position Position of the EXTRACTION BAR at the start and end of a cycle.
Home position is 3.8 - 4.5 cm (1.5 - 1.75 in.) above the position of
the REFERENCE SENSOR. The home position is set in the factory,
but can be adjusted in the field if necessary.
Start of scan
position
Position of the EXTRACTION BAR when the SCREEN is in position
to be scanned. The start of scan position is a set number of counts of
the ENCODER below home position. The number of counts of the
ENCODER defines the mechanical start of scanning. The optical start
of scanning occurs after the MCPU BOARD sends a message to the
GALVO to start scanning the SCREEN. For more information about
the ENCODER, see ENCODER.
End of scan position The end of scan is defined by counts of the ENCODER, determined
by the size of the PLATE.
Erase position Position below the end of scan when the PLATE is located directly in
front of the ERASE LAMPS. The erase position is determined by the
size of the PLATE.
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