Component Testing Procedures - Amana DQ22HS 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
B5684106
B5795306
B5684118
Diode
Triac
MT2
MT1 GA TE
Capacitor
Snubber Assembly
Magnetron
Antenna motor
Blower Motor
Lamp
240 VAC 40 Watts
!
Component
Disconnect all wires from TCO.
Measure resistance across terminals.
Magnetron TCO (.250
Cavity TCO
Control TCO (.187
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 terminals.
Measure resistance from:
Terminal to terminal
Remove all wires from motor.
Measure resistance across coil.
Measure resistance
WARNING
Test

terminals)

terminals)
17
Results
Open at 280°F and closed at 180°F
Opens at 262°F (128°C)
Open at 280°F and closed at 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 Ω
Approximately 40 Ω or more
Infinite Ω
Infinite Ω
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 Ω
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 10,000 Ω
Approximately 34 Ω
Approximately 120 Ω
RS2220001 Rev. 2