the led worklight on the front flickers or doesn't come on, but the saw still runs.

Diagnosis

The flickering or complete failure of the LED worklight on the Makita XSR01Z, while the motor continues to operate, is almost never a failure of the diode itself. Instead, this is a mechanical failure of the electrical connection. Because the XSR01Z is a high-torque, 36V tool designed for heavy-duty cutting, it generates significant high-frequency vibration. This vibration causes "work hardening" and eventual fatigue in the thin-gauge wires connecting the LED module to the primary control board. Specifically, the solder joints at the LED terminal or the crimps in the wiring harness near the front of the shoe are the primary failure points. When the wire frays or the solder joint cracks, the connection becomes intermittent, leading to the flickering effect as the tool vibrates during a cut. You can confirm this by running the saw without a load and gently tapping the plastic housing near the LED; if the light flashes, you have a loose connection rather than a burnt-out bulb.

How to Fix It

To resolve this, you must access the internal wiring harness. Ensure the 18V batteries are removed before proceeding.

1. Remove the external housing screws. Use a T20 Torx driver to remove the screws securing the main motor shroud and the lower shoe assembly.
2. Carefully peel back the plastic housing. Be mindful of the trigger assembly wires so you do not snag them or pull them from their sockets.
3. Locate the LED module situated at the front of the tool. Follow the two thin wires (typically red and black) leading from the LED back toward the main PCB (Printed Circuit Board).
4. Inspect the solder points where the wires meet the LED board. If you see a ring-shaped crack in the solder, use a 30W soldering iron and a small amount of 60/40 rosin-core solder to reflow the joint.
5. If the break is in the wire itself, cut the damaged section, strip 3mm of insulation from the ends, and solder them directly to the board or use a heat-shrink butt connector for a secure, vibration-resistant link.
6. Secure the wires against the inner chassis using a small zip-tie or a dab of high-temp silicone adhesive to prevent the wires from rubbing against the metal shoe, which prevents future fatigue.
7. Reassemble the housing, ensuring no wires are pinched between the plastic shells, and tighten all T20 screws firmly.

If That Didn't Work

• Check the LED switch trigger interface. On some XSR01Z units, the LED is tied to the trigger pull. If the internal micro-switch for the light is fouled with sawdust, the connection may be intermittent. Use compressed air to blow out the trigger housing and a small amount of electronic contact cleaner on the switch terminals.
• Test for a faulty LED module. If the wiring is intact but the light remains dead, the LED board itself may have suffered a voltage spike. You can test this by using a multimeter to check for continuity across the LED terminals; if the circuit is open, the module must be replaced (Part No: specific to the 36V XSR series).
• Inspect the main PCB for "cold" solder joints. Occasionally, the vibration affects the output pin on the main controller board rather than the LED end. Inspect the board for any loose components or cracked solder around the LED output pins and reflow as needed.
• Verify battery contact stability. While the saw runs, a momentary voltage drop in the battery terminals can cause the LED (which has a lower tolerance for voltage fluctuations) to flicker. Clean the battery terminals with isopropyl alcohol and a cotton swab to ensure a perfect connection.

Heads Up

• Avoid using oversized solder blobs; excessive solder can lead to "cold joints" that are actually more prone to cracking under vibration than a clean, concave fillet.
• Never use a soldering iron on the wires while the batteries are inserted, as a short circuit on a 36V system can instantly fry the main control board.
• When reassembling, ensure the wire routing follows the original factory paths. If a wire is routed too close to the blade guard or the shoe, it will be severed during normal operation.
• Periodically blow out the LED lens with compressed air. Accumulated sawdust can create a heat trap, which may degrade the LED's lifespan over several years of heavy use.