g. Logic and Collimator Operation Checkout (using internal signals).
The cassette tray must be removed for the following procedures.
SW2-1 through 4 and SW3-1 through 4 must be "OFF".
(1) Angle the table to 0 degrees horizontal and the collimator to 0 degrees
beam-down position. Light-emitting diode-4 on the logic P.C.B. must be ON. Using a
steel measuring rule, measure the distance from the center of the plastic exit window to
the center of the cassette tray (image receptor). Set this distance to 30 5/8 1/16 inches
in order to achieve a 40-inch focal-spot-to-table-top distance.
(a) The ON and MANUAL indicators on the collimator front panel
should be ON.
Light-emitting diode-2 on the logic PCB should be ON.
(2) Set SW2-1 and SW2-3 "ON" to simulate a 14 x 14-inch cassette. Set
SW3-4 "ON" to simulate the insertion of cassette in the cassette tray.
Light-emitting diode-2 (IR TRUE) should switch OFF.
(b) The MANUAL indicator should switch OFF.
The HOLD indicator should switch ON.
(3) Set SW3-2 "ON" to simulate a 40-inch SID switch closure. Move the
front panel sliding SID scale knob to the 40-inch detented position.
(a) The 40-inch indicator should switch ON.
(b) The collimator-field-size indicators (front panel) should rapidly
adjust to about 14 inches x 14 inches and stop.
The HOLD indicator should switch OFF.
(d) The READY indicators should switch ON.
(e) The light-field size on the table top (40 inches) should be about 14
x 14 inches. Use test pattern 70-09015.