k. Inspect the Developer Recirculation System. After changing developer
solutions or when conducting scheduled services you, as the medical equipment
repairer, check the developer circulation system.
(1) Check the turbulence at solution surface. Remove the developer-fix
crossover, activate the pumps, and check the turbulence at the solution surface. If
there is no recirculation, check to see that the pump is operating.
(2) Check the developer recirculation system filter. Change the filter at
least once a month or after feeding approximately 5,000 films in accordance with the
manufacturer's service manual. A dirty filter will decrease turbulence.
(3) Lubricate. After it has been six months since you have lubricated the
processor replenisher and the recirculation motors, you must lubricate them per
procedures in paragraph 2-3c(2).
l. Inspect the Developer Thermostat. With a thermometer of known
accuracy, check the developer solution within the processing tank. The developer
thermostat has been set at the factory to 95F (35C). If adjustment is necessary, see
Lesson 3, Perform Calibration/Verification of X-ray Film Processors.
m. Check the Incoming Water Supply. If you cannot maintain accurate
developer temperature, check the incoming water supply to be sure it is adequate. See
n. Inspect the Mixing Valve. See figure 2-5.
(1) Check the strainers. If there is insufficient water being delivered to the
processor even though the line pressure is normal, check the strainers for cleanliness.
(a) Turn off the water at the slotted shut-off screw, or at the valves (if
installed) ahead of the mixing valve.
(b) Remove the hex-head plugs and clean the strainers.
(c) Be sure the strainers cover the openings toward the pipe unions
when you reinstall them.
(2) Adjust the temperature. If the wash tank water temperature is too hot or
too cold, adjust the temperature. See Lesson 3 for calibration procedures.
(3) Check the gauge. The external water gauge should be set at 85 to
90F (29.4 to 32.2C). Refer to Lesson 3 for the verification procedures to check the