BEFORE WORKING ON MICROWAVE, ALWAYS MAKE SURE YOU UNPLUG THE OVEN AND FULLY DISCHARGE THE HIGH VOLTAGE CAPACITOR.
On information on how to safely discharge the high voltage capacitor, please visit the link below:
How To Safely Discharge A Capacitor?
Testing the HV Capacitor
Carefully disconnect/remove the terminals
Part 1: Visual Inspection
Visually inspect for:
Signs of burning or arcing at the insulators
Signs of bulging case
Signs of oily residue for dielectric leakage often present with a distinct smell.
Part 2: Multimeter Inspection
Using a multimeter, measure the resistance with the highest ohm range:
Measure from one terminal to the other for a normal reading of infinity (or the value of the bleeder resistor).
Now reverse the leads. The meter should momentarily deflect toward the zero mark, then slowly drift back to infinity.
Reverse the leads once again. This should produce the same meter deflection.
Next measure from each terminal to the capacitor’s metal case for a normal reading of infinity. (If there is an internal diode, the meter readings will reflect the diode’s forward bias resistance. (See HV diode test procedure)
Results:
momentarily middle position and then soon reach 10 Meg ohm…P
continuity or infinite ohms from beginning
Last Updated on August 28, 2021 by HelpDesk
Was this helpful?
0 / 0