LESSON 3
PERFORM CALIBRATION/VERIFICATION ON X-RAY FILM PROCESSORS
3-1.
GENERAL
Performing PMCS on a routine basis ensures that the x-ray film processor
remains serviceable and operates properly. In addition to performing PMCS, you must
also calibrate the processor. Calibrating such items as the developer and dryer
temperatures, and the replenishment levels, is critical to the quality of the resulting
processed film. To perform these tasks you need a medical equipment repairer's tool
kit, a voltmeter, and a non-mercury process thermometer.
3-2.
CALIBRATE THE AFP 14-X3
a. Calibrate the Temperature.
(1) Calibrate the developer scale offset. You have replaced the temperature
PC board J3, a temperature sensor, or dial and must, therefore, calibrate the circuit
using the following procedures.
(a) Allow the processor to warm up to the desired temperature setting.
The FEED indicator should be lit.
(b) Remove the top cover and front panel.
(c)
Place an accurate process thermometer in the developer solution.
CAUTION:
Do not use a mercury thermometer, as the mercury will contaminate the
tank and rack if the thermometer should break.
(d) Measure the voltage between TP3 and TP1 (common) on J3.
Refer to Lesson 1, figure 1-16. Note this voltage (approximately 5.5vdc), and keep the
voltmeter hooked up to the test point.
(e) Use a small screwdriver at trimpot R4 on J3 for this step. Set the
temperature dial to the actual solution temperature. Quickly adjust R4 to bring the
voltage back to the previously noted voltage.
Calibrate the dryer. Repeat the same procedure for the dryer.
(2)
NOTE:
You must check dryer temperature with the top cover in place.
(a) Place a thermometer of known accuracy in the dryer air path to
measure actual temperature.
MD0359
3-2
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