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11–54
[1] The SLOW SCAN MOTOR starts turning the LEADSCREW, pulling the
PLATE out of the CASSETTE and downward.
Note
When the PLATE leaves the CASSETTE, the EXTRACTION BAR holds the
PLATE in a 1 degree tilt to the left.
[2] As the EXTRACTION BAR moves down, it rides along the UPPER PLATE
GUIDE CAM and the LOWER PLATE GUIDE CAM.
(a) The UPPER and LOWER PLATE GUIDE ACTUATORS contact the
UPPER and LOWER PLATE GUIDE CAMS in turn as the
EXTRACTION BAR moves down.
(b) The PLATE GUIDE CAMS move the GUIDE BRACKETS to the left to
allow the EXTRACTION BAR to pass.
[3] After the EXTRACTION BAR passes, the UPPER and LOWER PLATE
GUIDE ROLLERS return to guide the PLATE. These ROLLERS ride along
the back side (non-image side) of the PLATE to position it optimally to be
scanned by the LASER beam.
[4] When the PLATE reaches the PLATE PRESENT SENSOR, S5, the SLOW
SCAN MOTOR stops.
[5] The S5 detects that a PLATE is present and reports the status to the MSC.
[6] The MSC tells the SLOW SCAN to load the PLATE.
[7] While the PLATE is moving into the Start of Scan position, the MCPU:
(a) Turns on and zeros the PMTS
(b) Opens the LASER SHUTTER
(c) Performs a LASER Reference Check
Note
See IMAGE PROCESSING OPERATIONS for details of the operation of the
LASER and the entire image processing sequence of operations.
[8] When the PLATE is at the Start of Scan position, as known by the encoder
counts, the MSC energizes the COLLECTOR NOSEPIECE SOLENOID,
L2.
[9] The L2 moves the NOSEPIECE into the NOSEPIECE Engaged position.
[10] The NOSEPIECE ENGAGED SENSOR, S7, reports that the NOSEPIECE
is in position for scanning.
12/12/94 – 1234563
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