THEORY GUIDE Sequence of Operation
10DEC05
TG4825-1
Page
27 of 120
Preparing to Scan
1 The SLOW SCAN MOTOR starts rotating the LEAD SCREW, pulling the PLATE down
from the CASSETTE.
• When the EXTRACTION BAR moves down to the position immediately before
scanning starts, the LOWER ARM of the PLATE POSITIONING AY moves forward to
touch the back of the PLATE, which is partially out of the CASSETTE SHELL. The
LOWER ARM keeps the PLATE from touching the WALLS of the CASSETTE when it
moves out of the CASSETTE.
• After the LOWER ARM moves forward to touch the back of the PLATE, the UPPER
ARM of the PLATE POSITIONING AY also moves forward. It keeps the larger PLATE
steady during scanning and when they leave and move back into the CASSETTE.
2 When the PLATE is moving into the start of scan position, the MCPU BOARD A2
energizes the PMTs and sets the SIGNAL CHANNEL for the PMTs to 0.
Status Summary: PLATE Fastened
• DUPLEX CAM has reached position 3
• SLED is 1.524 cm (0.600 in.) forward from the home position
• CLAMP BARS are holding the CASSETTE
• PLATE is fastened to the EXTRACTION BAR
• EXTRACTION BAR is at home position with the fastened
PLATE
• PIVOTING PLUSH has made a light-tight environment
around the CASSETTE
• DUPLEX CAM MOTOR M1 is de-energized
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