Turn the unit on and allow a 5-minute warm-up period.
(e) Set the multimeter to direct current milliampere (dcma) and range
control to 10ma.
(f) Set the time selector to 2.0 seconds and make an exposure by
holding the exposure button down.
(g) Ensure the buzzer sounds and the red radiation light comes on.
The reading should be 7ma with a tolerance of +1.2ma to -2ma at 60 Hz or
+1.0ma to -2.5ma at 50 Hz. If the tolerance is exceeded, you must replace or
repair circuit board D1.
Replace the cover on the control.
(9) Inspect the tube head from stop to stop. If the tube head turns more
than 540 (1 1/2 turns), you must replace the rotational part. See Lesson 4, Remove
and Replace or Repair defective modules in the Inter-oral Dental X-ray.
(10) Correct minor deficiencies.
(11) Record the deficiencies not corrected on DA Form 2404 and complete
the appropriate reports and forms.
c. Weekly Preventive Maintenance Checks and Services. Within one week
of previous weekly maintenance or if equipment is dusty or dirty, wipe all equipment
surfaces with a damp lint free cloth.
d. Daily Preventive Maintenance Checks and Services. You must conduct
visual checks and tests before the unit is operated.
Verify that all labels are affixed and legible. See figure 1-2.
Look for mechanical damage possibly affecting radiation safety.
(3) Inspect components for rust, cracks, wear, fraying electrical cords,
missing parts, and operator's publication.
Test the tube head in all working positions for possible drift.