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Component Specifications
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
Blower Motor
Line Filter
Line
Load
Earth
Wire Harness
16500017
!
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 motor.
Measure resistance across coil ...................... Approximately 30 Ω
Line to Line .....................................................
Load to Load...................................................
Line to Load ....................................................
Any terminal to Earth ......................................
Test continuity of wires ................................... Continuity.
Testing
2
Results
Open at 104° C (219° F).
Open at 138° C (280° F) and
closed at 82° C (180° F).
Infinite resistance should be
measured 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.
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.
.
.8 M Ω
.
.8 M Ω
.
Continuity.
Infinite.
July 2010
©2010 ACP, Inc.
.
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