Testing Procedures - Amana ALD10DT P1331001M Service Manual

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
Capacitor
Magnetron
Blower motor
Stirrer motor
Transformer
Secondary
Filament
Primary
Dial timer
Lamp and receptacle
Wire Harness
Electronic control
board
26
!
Component
Disconnect all wires from TCO.
Measure resistance across terminals.
Cavity TCO .............................................
Magnetron TCO ......................................
Discharge Capacitor
Remove diode lead from capacitor and
connect ohmmeter.
Reverse leads for second test.
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.
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 ..............
Remove all wires from motor.
Measure resistance across terminals .....
Discharge Capacitor
Remove all wires from terminals.
Measure resistance from:
Primary ..................................................
Filament.................................................
Secondary to Ground screw on
transformer stack...................................
Remove leads from timer contact
terminals.
Measure resistance of following
terminals:
⎯
3 to 4
⎯
3 to 4
⎯
2 to 3
Test continuity of receptacle terminals.
Test continuity of wires
Test interlock assembly switches.
Test cavity TCO.
W ARNING
Testing
Timer in OFF position .................
Timer in ON position ...................
Timer in OFF or ON position ......
16400005
Results
Closed at 122ºF (50ºC) and
Opens at 185ºF (85ºC)
Closed at 249ºF (115ºC) and
Opens at 320ºF (160ºC)
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.
Between Terminals: Meter should
momentarily deflect towards zero
Ω
then return to over 5 M . If no
deflection occurs, or if continuous
deflection occurs, replace capacitor.
Terminal to Case: Infinite resistance
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.
Ω
Approximately 44
Ω
Approximately 3.8K
Ω
Less than <1
Ω
Less than <1
Ω
Approximately 110
If timer does not indicate readings
below, replace timer.
Ω
Infinite
Ω
Approximately <1
Ω
Approximately 3.3 K (timer motor)
Indicates continuity with bulb
installed.
Indicates continuity
If interlock switch assembly and
cavity TCO is operating correctly. If
the control board still has no display,
replace control board.
©2009 ACP, Inc.
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