Component Testing Procedures
WARNING
To avoid risk of electrical shock, personal injury, or death, disconnect power to oven and discharge capacitor
before servicing, unless testing requires it.
RS2240002 Rev. 1 17
Illustration Component Testing Results
Thermal Cutout 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)
Diode Assembly
Discharge Capacitors
Remove diode lead from capacitor and
connect ohmmeter.
Reverse leads for second test.
Infinite resistance should be
measured in one direction and 50K
Ω
or more in the opposite direction.
NOTE:
Analog meter must contain a
battery of 6 volts minimum.
MT2
MT1 GATE
Triac 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
Capacitor
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 M
Ω
. IF no
deflection occurs, or if continuous
deflection occurs, replace capacitor.
Terminal to Case: Infinite resistance
Snubber Assembly Disconnect wires to snubber.
Measure resistance across terminals. Infinite
Magnetron
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.
Blower Motor Remove all wires from motor.
Measure resistance across coil.
Approximately 30
Ω
Antenna motor Remove all wires from motor.
Measure resistance across terminals.
Circuitry
120 VAC
Approximately 3.4 K
Ω
230 VAC
Approximately 12 K
Ω
208
COM
230
120
Auto Transformer
230
208
120
0
Discharge Capacitors
Remove all wires from terminals.
Measure resistance from:
230 to 0
208 to 0
120 to 0
42.4
Ω
38.6
Ω
21.5
Ω
Wire Harness Test continuity of wires. Indicates continuity
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