the lidar tower on top keeps spinning after it's docked or turned off, makes a whirring sound.

Diagnosis

The continuous spinning or "hunting" behavior of the LiDAR (Light Detection and Ranging) turret on the Roborock Q7 Max occurs when the internal optical sensor cannot detect the "home" or "index" position of the laser assembly. When the vacuum is powered down or docked, the system attempts to park the turret in a specific calibrated position. If the motor cannot confirm the turret has reached this coordinate, it will continue to rotate indefinitely or oscillate back and forth, creating a persistent whirring sound. This is almost always caused by a physical obstruction—typically a long human hair, a piece of translucent sewing thread, or a concentrated buildup of fine dust—that has migrated under the rotating shroud. This debris creates just enough friction or displacement to prevent the turret from seating perfectly, or it physically blocks the internal infrared index marker. In some cases, a slight impact to the top of the unit can knock the turret slightly off its axis, causing the motor to "over-correct" during the shutdown sequence.

How to Fix It

To resolve the spinning turret, you must manually clear the spindle and reset the sensor's home position. Follow these exact steps:

1. Power the unit completely off using the physical power button on the side of the chassis to prevent the motor from engaging while your fingers are near the mechanism.
2. Locate the circular LiDAR turret on top of the device. Place your palm flat on the center of the turret and apply light, downward pressure (do not force it) to ensure the assembly is seated firmly in its housing.
3. Using your finger, gently rotate the turret clockwise and counter-clockwise through a full 360-degree rotation. If you feel a "catch" or a rhythmic resistance, there is a foreign object inside.
4. Take a pair of fine-tipped tweezers or a needle and inspect the narrow gap between the rotating top cap and the stationary base of the tower. Look for hair or lint wrapped around the central spindle.
5. Carefully pull out any debris. If the hair is tightly wound, use the needle to lift the hair and snip it with small scissors before pulling it out to avoid damaging the internal belt.
6. Once cleared, use a can of compressed air to blow out the gap between the turret and the body, clearing any microscopic dust that may be interfering with the optical sensor.
7. Place the unit back on the dock and power it on to see if the whirring has ceased.

If That Didn't Work

• Manual Calibration Reset: If debris wasn't the cause, the turret may be mechanically misaligned. While the unit is on, gently nudge the turret in the opposite direction of the spin with a finger. This can sometimes "trip" the sensor into recognizing the home position and stop the loop.
• Deep Clean the Optical Window: Use a dry microfiber cloth and a small amount of isopropyl alcohol (70% or lower) to wipe the inner perimeter of the LiDAR window. A smudge of oil or a thick layer of dust on the internal mirror can prevent the laser from reading the index mark.
• Hard Power Cycle: Turn the unit off and leave it off the dock for at least 30 minutes. This clears the temporary volatile memory (capacitor discharge) and forces the firmware to re-initialize the LiDAR calibration sequence from scratch upon the next boot.
• Check for Component Play: Gently wiggle the turret. If it feels loose or "wobbly" rather than just spinning, the internal plastic mounting bracket may have snapped. In this case, the entire LiDAR module (Part No. Q7MAX-LIDAR-ASSY) requires replacement as the motor cannot align a loose assembly.

Heads Up

• Never spray liquid cleaners or water directly into the LiDAR turret gap, as this will fog the laser lens and permanently disable the navigation system.
• Avoid using high-pressure air compressors; stick to canned air or a soft brush to prevent blowing dust deeper into the motherboard.
• If you have pets that shed long hair, check the LiDAR turret weekly as part of your maintenance routine to prevent the spindle from seizing.
• Avoid placing the robot under low-clearance furniture where the top of the turret might be bumped, as this is the primary cause of mechanical misalignment.