Roper Microwave Turntable Grinding Noise or Not... | appliancefaults.com

Technical Background:

The microwave's main control unit (MCU) sends a 120V AC signal to the turntable motor. The motor then rotates the turntable via a coupler. Mechanical wear or electrical failure within the motor or its control circuitry will cause the symptoms.

Symptoms:

The Roper microwave turntable is making a loud grinding noise during operation, or it is not spinning at all. Food is not heating evenly.

Possible Causes:

Faulty turntable motor.
Worn or broken turntable coupler.
Damaged turntable support roller ring.
Debris or food particles obstructing the turntable's rotation.
Defective turntable motor control in the MCU.

Solution:

1

Unplug the microwave from the outlet. Verify no voltage at the receptacle using a multimeter.
2

Remove the turntable and the turntable support roller ring.
3

Inspect the turntable coupler for cracks, damage, or wear. Replace if necessary. (Part number varies - check your model).
4

Check for any obstructions or debris under the turntable area and inside the microwave. Clean thoroughly.
5

Using a Phillips head screwdriver, remove the microwave's outer case. Locate the turntable motor (usually at the bottom).
6

Disconnect the wires to the turntable motor. Use a multimeter to test the motor for continuity. An open circuit indicates a faulty motor. A normal reading would typically be between 20-50 ohms.
7

If the motor tests good, the issue might be with the microwave's main control unit (MCU). Further diagnosis of the MCU requires specialized knowledge. Consult a qualified technician.

Safety Warning:

Always unplug the microwave before attempting any repairs. Microwaves contain high voltage components that can be lethal even after being unplugged. Lock Out/Tag Out (LOTO) procedures should be followed. Capacitors can store a charge; discharge them before working on internal components.

Prevention:

Regularly clean the inside of the microwave to prevent food debris from accumulating. Do not overload the turntable with excessively heavy dishes. Avoid using metal cookware unless specifically designed for microwave use.

Expert Tip:

Some Roper microwaves have a built-in diagnostic mode. Press and hold the “Stop” and “Timer” buttons simultaneously for 3 seconds. This may display error codes related to the turntable motor circuit.

Frequently Asked Questions

•How do I safely discharge a capacitor in the microwave?

Using an insulated screwdriver with a well-insulated handle, carefully short the terminals of the high-voltage capacitor. Be extremely cautious and ensure the screwdriver is rated for high voltage.

•What voltage should I expect to see at the turntable motor connector when the microwave is running?

You should typically see 120V AC at the connector to the turntable motor when the microwave is operating and the turntable is supposed to be spinning. Use a multimeter to verify.

•Where can I find the correct replacement turntable motor for my Roper microwave model?

You can find replacement parts by searching online appliance parts retailers. You will need the microwave's model number, which is usually located on a sticker on the back or inside the door frame.

Roper Microwave Turntable Grinding Noise or Not Spinning: Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I safely discharge a capacitor in the microwave?

•What voltage should I expect to see at the turntable motor connector when the microwave is running?

•Where can I find the correct replacement turntable motor for my Roper microwave model?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: