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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.

Illustration

Thermal Cutout

Diode Assembly

Triac

MT2

MT1

GA TE

Capacitor Doubler

Snubber Assembly

Magnetron

Blower Motor

Antenna motor

Wire Harness

16500038

Component

Disconnect all wires from TCO.

Measure resistance across terminals.

Cavity Thermal Fuse ...................................

Magnetron TCO ...........................................

Discharge Capacitors

Remove diode lead from capacitor and

connect ohmmeter.

Reverse leads for second test.

Disconnect wires to triac.

Measure resistance from:

MT1 to MT2 .................................................

MT1 to Gate ................................................

MT2 to Gate ................................................

All terminals to ground .................................

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.

Disconnect wires to snubber.

Measure resistance across terminals............. Infinite.

Discharge Capacitors

Remove wires from magnetron and connect

ohmmeter to terminals. Also check

between each terminal and ground.

Remove all wires from motor.

Measure resistance across coil ....................... Approximately 30 Ω.

Remove all wires from motor.

Measure resistance across terminals.............. Approximately 3.4 KΩ.

Test continuity of wires ................................... Continuity.

Testing

Open at 219° F (104° C).

Open at 280° F (138° C) and

Infinite resistance in one direction

and 50KΩ or more in the opposite

direction.

NOTE: Analog meter must contain a

battery of 6 volts minimum.

Caution - Do not operate oven with

wire to terminal MT2 removed.

Infinite.

Approximately 40 Ω or more.

Infinite.

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.

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.

Results

closed at 180° F (82° C).

July 2012