Component Testing Procedures - Maytag RS511 Service Manual

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
Capacitor
Diode assembly
Magnetron
Fan motor
Transformer
1
6
COM
4
5
1
230 V
2
Line filter
White
Blue
IN
IN OUT
Light
Dark
Brown
Brown
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Component
Disconnect all wires from TCO.
Measure resistance across terminals.
Magnetron TCO ..........................................
Cavity TCO .................................................
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.
Discharge Capacitors
Remove diode lead from capacitor and
connect ohmmeter.
Reverse leads for second test.
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. ...............
Discharge Capacitors
Remove all wires from terminals.
H.V.
Measure resistance from:
Secondary
Primary
Primary #1 to #2 .....................................
4
5
Secondary #4 to transformer base plate.
Filament
2
6 Filament #5 to #6 ....................................
Disconnect wire from terminals.
Measure resistance of the following
terminals:
OUT
Blue to White..........................................
Dark Brown to Light Brown....................
16021518 Rev. 0
W ARNING
Test Results
Open at 138°C (280°F) and
closed at 82°C (180°F)
Opens at 117°C (243°F)
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
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.
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 re-test.
Approximately 40 Ω
Approximately < 1 Ω
Approximately 83 Ω
<1 Ω
< 1 Ω
< 1 Ω
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