Component Testing Procedures - Amana ASE7000 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 power.
Illustration
Thermal cutout
Diode
Triac
MT2
MT1 GA TE
Triac 1 (center)
Triac 2 (left)
Triac 3 (right
Capacitor
Some unit may use
more then one type of
capacitor, Refer to
Parts Manual for
correct capacitor
quantity.
Snubber assembly
Magnetron
Blower motor
RS2240003 Rev. 0
!
Component
Disconnect all wires from TCO.
Measure resistance across terminals.
Magnetron TCO ...................................
Cavity TCO ..........................................
Discharge Capacitor
Remove diode lead from capacitor and
connect ohmmeter.
Reverse leads for second test.
Resistance Check
Disconnect wires to triac.
Measure resistance from:
MT1 to MT2 .........................................
MT1 to Gate.........................................
MT2 to Gate.........................................
All terminals to ground .........................
Voltage Check
Measure voltage from:
MT1 to Gate
Discharge Capacitor
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 Capacitor
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 .................
WARNING
Test
12
Results
Open at 300 F (149 C) and closed at
257 F (125 C)
Opens at 262 F (128 C)
Infinite resistance should be measured
in one direction and 50K or more in
the opposite direction.
NOTE: Ohmmeter must contain a
battery of 6 volts minimum.
Caution - Do not operate oven with
wire to terminal MT2 removed.
Infinite
Approximately 60
Infinite
Infinite
0.8 VAC when energized. If no
voltage, check H.V. board and wiring.
Between Terminals: Meter should
momentarily deflect towards zero then
return to over 5 M . If no deflection
occurs, or if continuous deflection
occurs, replace capacitor.
Terminal to Case: Infinite resistance
Infinite
Between Terminals: Less than 1
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 25