Component Testing Procedures - Amana LD510D Service

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
Turntable motor
Fan motor
Transformer
Filament
Secondary
Primary
Interlock switches
NO
Primary
switch
COM
NC
Monitor
COM
switch
Secondary
NO
switch
COM
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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 terminals.
Measure resistance from:
Terminal to terminal
Remove all wires from motor.
Measure resistance across coil.
Discharge Capacitors
Remove all wires from terminals.
Measure resistance from:
Primary....................................................
Secondary to transformer base plate......
Filament ..................................................
Disconnect wires to switch
With door open measure resistance from:
COM to N.O.Primary .............................
COM to N.C.Monitor..............................
COM to N.O.Secondary ........................
With door closed measure resistance from:
COM to N.O.Primary .............................
COM to N.C.Monitor..............................
COM to N.O.Secondary ........................
16022150 Rev. 0
WARNING
Test Results
Open at (145°C) 293°F and
closed at (85°C) 185°F
Opens at (110°C) 230°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 12−14 KΩ
Approximately 350−450 Ω
Approximately 1.4 – 2.2 Ω
Approximately 90 - 110 Ω
<1 Ω
Infinite Ω
0 Ω
Infinite Ω
0 Ω
Infinite Ω
0 Ω
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