Component Testing Procedures - Amana CRC18T2OG 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
Diode Assembly
Triac
MT2
MT1 GA TE
Capacitor
Snubber Assembly
Magnetron
Blower Motor
Antenna motor
Auto Transformer
208
COM
120 230
Wire Harness
RS2240002 Rev. 1
!
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.
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.
Remove all wires from motor.
Measure resistance across terminals.
Discharge Capacitors
230
Remove all wires from terminals.
208
Measure resistance from:
230 to 0
120
208 to 0
120 to 0
0
Test continuity of wires.
WARNING
Testing
17
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 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
Infinite
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.
Approximately 30 Ω
Circuitry
120 VACApproximately 3.4 KΩ
230 VACApproximately 12 KΩ
42.4 Ω
38.6 Ω
21.5 Ω
Indicates continuity