(4)
Set SW3-2 "OFF" (opening of the 40-inch SID switch).
(a) The 40-inch indicators should switch OFF.
(b) The READY indicators should switch OFF.
(c)
The HOLD indicator should switch ON.
(5) Set SW3-3 "ON" to simulate the 72-inch SID switch closure. Move the
front panel sliding SID scale knob to the 72-inch detented position.
(a) The 72-inch indicator should switch ON.
(b) The collimator field size indicators (front panel) should rapidly
adjust to about 14 x 14 inches and stop.
(c)
The HOLD indicator should switch OFF.
(d) The READY indicators should switch ON.
(e) The light field size on the table top (40-inch) should be about
7.8 x 7.8 inches (14 x 14 inches at 72 inches with a 56-percent reduction due to 40-inch
positioning). Use test pattern 70-09015.
(6)
Set SW3-3 "OFF" (opening of 72-inch SID switch).
(a) The 72-inch SID indicator should switch OFF.
(b) The READY indicators should switch OFF.
(c)
The HOLD indicator should switch ON.
h. External Surface-to-Image Distance Signal Checkout (horizontal). Angle
the collimator to 90 degrees with the X-ray beam at the wall mounted cassette holder.
Angle the table to 0 degrees horizontal.
(1) If the cassette holder is on the wall adjacent to the head-end of the table,
this requires the collimator to be at +90 degrees beam-left.
(a)
Light-emitting diode-1 on the logic PCB must be ON.
(b) Set SW3-5 "ON" on the logic PCB to select left-wall operation.
MD0351
1-40