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Section 8: Scan/Erase Subsystem
Function/Components
The Scan/Erase Subsystem is responsible for moving the STORAGE PHOSPHOR PLATE through the field of scan at a uniform velocity, then moving it to the erase
position where it is erased, and finally moving it back up to be inserted into the CASSETTE SHELL.
Illustration of the most of the components
on the right in correct relationship to each other.
8–34
LEAD SCREW
The LEAD SCREW is coupled to the MOTOR SHAFT.
As the LEAD SCREW turns, it moves the
EXTRACTION BAR up and down.
S9 EXTRACTION
The S9 looks for a flag on the EXTRACTION BAR to
BAR REFERENCE
orient the SLOW SCAN AY to the reference position.
SENSOR
All other positions of the SLOW SCAN AY are relative
to the reference position.
S6 NOSEPIECE
The S6 monitors the position of the NOSEPIECE to
CLEAR SENSOR
ensure that it is in the NOSEPIECE clear position to
allow the EXTRACTION BAR to pass as it moves down
and up. No SLOW SCAN movement will occur until the
NOSEPIECE clear position is verified.
L2 NOSEPIECE
The L2 controls the position of the NOSEPIECE, either
SOLENOID
engaged or clear. When the L2 is actuated the
NOSEPIECE moves to the engaged position
SLOW SCAN MOTOR The SLOW SCAN MOTOR is a 3-phase brushless DC
motor, responsible for all vertical PLATE movement.
See "A7 COIL BD Operation."
SLOW SCAN
The SLOW SCAN ENCODER monitors the speed and
ENCODER
position of the SLOW SCAN MOTOR to ensure
extreme smoothness and constant velocity in the
movement of the PLATE.
ERASE AY
The ERASE AY consists of 5 pairs of high intensity
lamps whose function is to expose the previously
scanned STORAGE PHOSPHOR PLATE with white
light to discharge any residual charge.
CS1-CS6 LAMP
A LAMP CURRENT SENSOR is associated with each
CURRENT SENSORS
BALLAST (1 per pair of ERASE LAMPS) and is
responsible for monitoring the current to the BALLAST.
K1 ERASE LAMP
Receives 120 V AC from PS 1 and relays it to the
RELAY
ERASE AY.
See "ENCODER Operation."
12/12/94 – 1234563
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