Pratica Chef Express Service Manual page 74

MICROWAVE SYSTEM
68
Testing for Microwave Leakage
An RF leakage test should be performed after the following service tasks:
• Door removal, replacement and/or adjustment
• Waveguide removal and/or replacement
• Magnetron removal and/or replacement
• Door switch adjustment and/or replacement
WARNING: This procedure requires work when the oven surfaces are extremely hot. Please
exercise caution to avoid burns during testing.
1) Turn the oven and allow the unit to reach the set point temperature.
2) Once the unit reaches temperature, fill a microwave and high temperature safe container with
275ml of water at 20C / 68F +/- 5 degrees and place in the middle of the cook cavity and close the
door (Pyrex product or similar are recommended).
3) Turn on the survey meter and perform all battery and self-test checks applicable per the
manufacturer's instructions.
4) Choose or create a menu program that is set to 100% microwave power and 30-45 seconds long
to give ample time to move the probe around the entire perimeter of the door.
5) Star the cook cycle and measure the microwave
emission with the meter, positioning it perpendicular to
the surface that is being measured. Make sure to move the
meter at 1.0 in per second while doing the test.
6) While performing the leakage test, note any meter
spike areas that come close to 5mW/cm2 for later re-
measurement.
7) Replace the water after scanning the door or every 30-
45 seconds. If testing is still required, do not run test with
boiling water. The water must start the test at the required
temperature of 20C / 68F +/- 5 degrees.
8) Make sure to retest any areas that had a reading spike,
allow the meter to stay in that area for approximately 15
seconds and measure the highest reading.
9) If microwave leakage is found, check for sings of damage and adjust the door accordingly to make
a proper seal.
10) Final readings must be below 5mW/cm2. If a level greater is observed, please notify Prática
Technical Support and take the oven out of service until the proper repairs or adjustments can be
made to bring made to bring the oven back within a safe operating level.