LESSON 1
PERFORM PREVENTIVE MAINTENANCE CHECKS AND SERVICES
ON THE INTER-ORAL DENTAL X-RAY
1-1.
GENERAL
To stay in compliance with the Department of Health and Human Services
(DHHS) requirements, you must maintain the Portaray Heliodent portable field dental
X-ray apparatus annually. It is your responsibility to maintain the equipment with the
manufacturer's recommended maintenance schedule to ensure compliance with the
Federal Performance Standard. Your failure to perform the manufacturer's
recommended maintenance relieves the manufacturer and his agents from
responsibility.
1-2.
PORTARAY COMPONENTS AND OPERATING CONCEPT
The Portaray unit consists on a carrying case, support stand, scissors arm, tube
head assembly, a control assembly, and a patient chair with adjustable head rest. The
unit has an operating tube voltage of 70 kilovolt potential (kvp) and a tube current of
7ma. The aluminum (Al) filtration in the useful beam is 2.7mm (millimeters) total. You
accomplish the exposure technique setting by matching the patient to the object on the
dial corresponding to the object being radiographed. You can operate the Portaray on
an adequate power supply of 109 volts alternating current (vac) to 133vac at 60 Hertz
(Hz), 109vac to 132vac at 50 Hz, and when you connect it to the transformer built into
the case, at 207vac to 242vac at 60 Hz and 207vac to 240vac at 50 Hz. See figure 1-1.
MD0361
1-2