Amana AMC5143BCB/W/Q Service Manual download pdf (Page 12)

Component Testing Procedures

WARNING

To avoid risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitor

before servicing, unless testing requires power.

RS2240003 Rev. 0 12

Illustration Component Test Results

Thermal cutout Disconnect all wires from TCO.

Measure resistance across terminals.

Magnetron TCO ...................................

Cavity TCO ..........................................

Open at 300°F (149°C) and closed at

257°F (125°C)

Opens at 262°F (128°C)

Diode

Discharge Capacitor

Remove diode lead from capacitor and

connect ohmmeter.

Reverse leads for second test.

Infinite resistance should be measured

in one direction and 50KΩ or more in

the opposite direction.

NOTE: Ohmmeter must contain a

battery of 6 volts minimum.

MT2

MT1 GATE

Triac

Resistance Check

Disconnect wires to triac.

Measure resistance from:

MT1 to MT2 .........................................

MT1 to Gate.........................................

MT2 to Gate.........................................

All terminals to ground .........................

Caution - Do not operate oven with

wire to terminal MT2 removed.

Infinite

Approximately 60 Ω

Infinite

Triac 1 (center)

Triac 2 (left)

Triac 3 (right

Voltage Check

Measure voltage from:

MT1toGate

0.8 VAC when energized. If no

voltage, check H.V. board and wiring.

Capacitor

Some unit may use

more then one type of

capacitor, Refer to

Parts Manual for

correct capacitor

quantity.

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.

Between Terminals: Meter should

momentarily deflect towards zero then

return to over 5 MΩ.Ifnodeflection

occurs, or if continuous deflection

occurs, replace capacitor.

Terminal to Case: Infinite resistance

Snubber assembly Disconnect wires to snubber.

Measure resistance across terminals ........ Infinite

Magnetron

Discharge Capacitor

Remove wires from magnetron and

connect ohmmeter to terminals. Also

check between each terminal and ground.

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.

Blower motor Remove all wires from motor.

Measure resistance across coil .................

Approximately 25 Ω

1 ... 11 12 13 ... 52

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Amana AMC5143BCB/W/Q Service Manual Page 12

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