Component Specifications
!
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitor before
servicing, unless testing requires power.
17
Illustration Component
Testing
Results
Thermal Cutout
Disconnect all wires from TCO.
Measure resistance across terminals.
Cavity Thermal Fuse ...................................
Magnetron TCO...........................................
Open:
104° C (219° F).
Open:
138° C (280° F.
Closed:
82° C (180° F).
1100 Watt units
1400, 1800, and 2100
Watt units
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:
Test meter must contain a
battery of 6 volts minimum.
MT2
MT1
GA TE
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
.
Earth
Load
Line
Line filter
Measure resistance:
Line to Line ..................................................
Load to Load................................................
Line to Load.................................................
Any terminal to Earth...................................
.8 M
Ω
.
.8 M
Ω
.
Continuity.
Infinite.
Wire Harness
Test resistance of wires .................................. Continuity.
