Turbo Chef Technologies Residential Single and Double Wall Oven service manual Microwave System

6.10TROUBLESHOOTING

to ensure accuracy. If either motor does not register between 5.9 and 7.3 ohms, replace that motor and retest the oven.

3.Verify 0-10 VDC is being sent to the motor controller.

-For Gen 1 ovens, check the control board on P10-1 and ground for upper, check P10- 2 and ground for lower.

-For Gen 2 ovens, check the relay board terminals RBJ22-5 and RBJ22-3 for upper, check RBJ22-6 and RBJ22-4 for lower.

-If no voltage is present, replace the control board.

4.Verify 208/240 input to motor controller by measuring the brown and blue wires on the 3-pin connector.

5.If all the above tests are verified, replace the motor controller.

Convection Fan, Lower Oven

1.Turn the lower oven mode dial to Convection Bake to activate the convection fan. If the fan does not activate immediately, turn the lower oven off and access the convection fan motor inside the oven (see page A.28).

CAUTION: Voltage on terminals could cause injury. Proceed with caution.

2.Apply the voltmeter probes to the convection fan motor’s terminals.

-If 120 VAC is not present, investigate the oven mode dial for a loose wire to terminal 3 or a faulty switch.

-If 120 VAC is present, the convection fan motor is faulty and needs to be replaced.

Microwave System

This section contains information on the following topics:

-Testing a capacitor

-Testing a high-voltage diode

-Testing a high-voltage transformer

-Testing a magnetron for open/shorted filament

See page 6.2 for additional troubleshooting for a magnetron failure message.

Testing a Capacitor

DANGER: Never attempt any measurement of the capacitors while they are enabled. Lethal voltage will be present. Measure only in compliance with these procedures.

To test for an open or shorted capacitor:

1.Disconnect the oven from the power source.

2.Fully discharge the capacitor.

3.Isolate the capacitor from the circuit.

4.Check for an open or shorted capacitor by placing ohmmeter leads between the capacitor terminals:

-Inconsistent readings = capacitor not shorted or open.

-Constant infinite resistance = capacitor open

-Constant very low resistance = capacitor shorted

5.If the capacitor is not open or shorted, set the meter to measure microfarad capacitance and again place the leads between the capacitor terminals. The meter reading should equal the label value, plus or minus 10%. If not, replace the capacitor.

To test for capacitor terminals that may be shorted to casing:

1.Disconnect the oven from the power source.

2.Fully discharge the capacitor.

3.Isolate the capacitor from the circuit.

4.Place one meter lead on a terminal and the other on the metal jacket of the capacitor. Infinite resistance must be seen. Any other reading means the capacitor should be replaced.

Testing a High-Voltage Diode

DANGER: Before replacing the high-voltage diode, ensure the oven is removed from any power source. Replacing this component while the oven is plugged in can result in serious injury or death.

DANGER: Never attempt to measure high voltage directly. Death or serious injury could result.

1.Disconnect the oven from the power source.

2.Fully discharge the capacitors.