Component Testing Procedures
To avoid risk of electrical shock, personal injury, or death, disconnect power to oven and discharge capacitor
before servicing, unless testing requires it.
16500038 July 2012
©2012 ACP, Inc.
Disconnect all wires from TCO.
Measure resistance across terminals.
Cavity Thermal Fuse ...................................
Magnetron TCO ...........................................
Open at 219° F (104° C).
Open at 280° F (138° C) and
closed at 180° F (82° C).
Discharge Capacitors
Remove diode lead from capacitor and
connect ohmmeter.
Reverse leads for second test.
Infinite resistance in one direction
and 50KΩ or more in the opposite
direction.
NOTE: Analog meter must contain a
battery of 6 volts minimum.
Disconnect wires to triac.
Measure resistance from:
MT1 to MT2 .................................................
MT1 to Gate ................................................
MT2 to Gate ................................................
All terminals to ground .................................
Caution - Do not operate oven with
wire to terminal MT2 removed.
Infinite.
Approximately 40 Ω or more.
Infinite.
Infinite.
Discharge Capacitors
Remove wires from capacitor terminals and
connect ohmmeter, set on highest
resistance scale to terminals.
Also check between each terminal and
capacitor case.
Between Terminals: Meter should
momentarily deflect towards zero
then return to over 5 MΩ. If no
deflection occurs, or if continuous
deflection occurs, replace capacitor.
Terminal to Case: Infinite
resistance.
Disconnect wires to snubber.
Measure resistance across terminals.............
Discharge Capacitors
Remove wires from magnetron and connect
ohmmeter to terminals. Also check
between each terminal and ground.
Between Terminals: Less than 1 Ω.
Each terminal to ground measures
Infinite resistance.
NOTE: This test is not conclusive. If
oven does not heat and all other
components test good replace the
magnetron and retest.
Remove all wires from motor.
Measure resistance across coil .......................
Remove all wires from motor.
Measure resistance across terminals..............
Test continuity of wires ...................................
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