Sharp R-21LCFS Turntable Support Replacement – Step-by-Step Guide

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21LCFS Turntable Support Replacement Guide

If your Sharp R-21LCFS microwave turntable is wobbling, making grinding noises, or rotating unevenly, the turntable support has likely failed or become damaged. The turntable support holds the roller ring and provides a stable base for the glass plate. Replacing it is a MODERATE difficulty repair.

Symptoms of Turntable Support Failure

Common signs that indicate turntable support failure:

  • Turntable wobbles or doesn’t sit level
  • Grinding noise from the bottom during rotation
  • Uneven rotation or turntable slips
  • Turntable doesn’t rotate smoothly
  • Visible damage to the support mechanism
  • Turntable plate doesn’t sit properly on the support

⚠️ Safety Warning

Always unplug the microwave before beginning any repair. Wait 60 seconds after unplugging to allow capacitors to discharge. The turntable support area is at the bottom of the microwave and is generally low-voltage, but safety precautions are still essential.

Parts Needed

Check each product page for other buying options. (Part #: RSUP-A019WRKZ)

Note: You may also want to check the roller ring and turntable motor if they show signs of wear or damage.

Tools Required

  • Phillips Screwdriver – #2 size
  • Flashlight – To see under the microwave
  • Clean cloth – For cleaning the support area

Step-by-Step Instructions

Step 1: Unplug and Prepare

Unplug the microwave from the wall outlet. Remove the glass turntable plate and the roller ring from inside the microwave. Set them aside in a safe location. Turn the microwave upside down or on its side to access the bottom panel.

Step 2: Remove the Bottom Panel

Locate the screws securing the bottom panel. There are typically 4-6 screws around the perimeter. Remove all screws using your Phillips screwdriver. Some models may have clips in addition to screws. Gently lift the bottom panel away to expose the turntable support and motor area.

Step 3: Locate the Turntable Support

The turntable support is located in the center of the bottom area. It’s the mechanism that holds the roller ring and provides support for the glass plate. The support may be a ring, bracket, or assembly that the roller ring sits on. You’ll see it connected to the turntable motor shaft.

Step 4: Inspect the Support and Related Components

Before removing, inspect the support and related components:

  • Check the support for cracks, damage, or wear
  • Inspect the roller ring for damage
  • Look at the turntable motor shaft for damage
  • Check the coupling between motor and support
  • Verify the support sits level and doesn’t wobble

Step 5: Remove the Support

The turntable support may be held in place by screws, clips, or may simply lift off the motor shaft. Remove any mounting hardware. If it’s connected to the motor shaft via a coupling, you may need to remove the coupling first. Gently remove the old support.

Step 6: Clean the Support Area

While the support is removed, clean the support area:

  • Remove any debris, grease, or food particles
  • Clean the motor shaft if accessible
  • Wipe down the area where the new support will sit
  • Ensure the area is dry before installing the new support

Step 7: Install the New Support

Position the new Sharp RSUP-A019WRKZ turntable support in the same location as the old one. Ensure it aligns properly with the motor shaft and sits level. The support should sit flush and provide a stable base for the roller ring. Secure it with any mounting hardware, being careful not to overtighten.

Step 8: Reinstall the Roller Ring and Plate

Turn the microwave right-side up. Place the roller ring in the bottom of the cavity (it sits on the support). Then place the glass turntable plate on top of the roller ring. Ensure the plate sits level and the support provides proper stability.

Step 9: Test the Installation

Plug the microwave back into the wall outlet. Place a cup of water in the center of the turntable. Start a 30-second cooking cycle. Watch to ensure:

  • The turntable rotates smoothly without wobbling
  • No grinding or unusual noises
  • The turntable remains level during rotation
  • The support provides stable support
  • Rotation is steady and consistent

Troubleshooting

If the turntable still wobbles or makes noise after replacement:

  • Verify the support is properly seated and level
  • Check the roller ring for damage (may also need replacement)
  • Inspect the turntable motor (may be failing)
  • Ensure the glass plate isn’t warped or damaged
  • Check for obstructions preventing smooth rotation
  • Verify the support is the correct size for your model

Maintenance Tips

To extend the life of your new turntable support:

  • Keep the turntable area clean and free of food debris
  • Don’t overload the turntable with heavy dishes
  • Ensure the glass plate sits level and isn’t warped
  • Clean the roller ring regularly
  • Avoid slamming the door, which can damage the support mechanism

When to Call a Professional

Consider professional help if:

  • The turntable motor also needs replacement
  • Multiple components are failing
  • The problem persists after replacement
  • You’re not confident in your ability to properly install the support

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