Amana Commercial Combination Oven Service Manual download pdf (Page 26)

Component Testing Procedures

Illustration Component Test Results

Thermal cutout

31866P01 ...............

B5684121...............

Disconnect all wires from TCO.

Measure resistance across terminals.

Control TCO . ............................................

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

Open at 300 ° F (149 ° C) and closed at

257 ° F (125 ° C)

Open at 280 ° F (137° C) and closed at

180

°F (82°C)

Diode

Discharge Capacitor

Remove diode lead from capacitor and

connect ohmmeter.

Reverse leads for second test.

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 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.

Approximately 60 Ω

Triac 1 (top) is for motors

Triac 2 (middle) is for heater element

Triac 3 (bottom) is for microwave

Voltage check measure voltage from:

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

0.8 VAC when energized. If no

voltage, check H.V. board and wiring.

Capacitors – 0.65 µf

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

return to over 5 M Ω

occurs, replace capacitor.

Snubber assembly Disconnect wires to snubber.

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

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

Note: This test is not conclusive. If

oven does not heat and all other

components test good replace the

magnetron and retest.

Microwave blower

motor

Remove all wires from motor.

Measure resistance across coil.

Approximately 30

Ω

Power relay Coil voltage – unit running

Terminal 0 to 1..........................................

Coil resistance

Terminal 0 to 1..........................................

(line voltage)

21 K Ω

WARNING

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

before following any disassembly procedures.

Relay Contacts 2 - 4...................................... (no voltage)

6 - 8...................................... (no voltage)

1 ... 25 26 27 ... 40

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Amana Commercial Combination Oven Service Manual Page 26

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