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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 power.
Illustration
Thermal Cutout
Diode Assembly
Triac
MT2
MT1
GA TE
Capacitor
Snubber Assembly
Magnetron
Stirrer Motor
Blower Motor
16500008
Replaces 16027357
!
WARNING
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 terminals.
Measure resistance from:
Terminal to terminal ..................................... Approximately 25 K .
Remove all wires from motor.
Measure resistance across coil ....................... Approximately 30
Test
2
Results
Open at 219° F (104° C).
Open at 280° F (138° C) and
closed at 180° F (82° C).
Infinite resistance should be measured
in one direction and 50K
or more in
the opposite direction.
NOTE: Test meter must contain a
battery of 6 volts minimum.
Caution - Do not operate oven with
wire to terminal MT2 removed.
Infinite.
Approximately 40
or more.
Infinite.
Infinite.
Between Terminals: Meter should
momentarily deflect towards zero then
return to over 5 M . If no deflection
occurs, or if continuous deflection
occurs, replace capacitor.
Terminal to Case: Infinite resistance.
Between Terminals: Less than 1
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.
.
January 2009
©2009 ACP Inc.
.
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