failure mode

FM-07: The Trigger Lock-Off Button Is Stuck Or No Longer Blocks The Trigger

The lock-off cannot be pressed to allow the trigger, does not return, or lets the trigger move without a deliberate lock-off action.

Diagnostic overview

The lock-off cannot be pressed to allow the trigger, does not return, or lets the trigger move without a deliberate lock-off action.

Likely Root Causes

  • Sawdust or impact damage is jamming the external button
  • Lock-off spring, button, or housing guide is broken or displaced
  • Trigger or switch housing is cracked or distorted
  • Internal switch assembly has failed

Quick Checks

  1. With the battery removed, the trigger is positively blocked at rest and moves only while the lock-off is deliberately operated.

Repair Preview

  1. Remove the battery before testing the lock-off, and keep fingers away from the trigger until power is removed.
  2. - Inspect the button and surrounding housing for cracks, binding, packed sawdust, or a button that does not return - clean externally with a dry brush or dry
  3. With no battery installed, press and release the lock-off several times while confirming that the trigger is blocked at rest and moves only during delibera
  4. - If the control remains stuck, broken, or unable to block the trigger, do not reinstall the battery - route the complete saw for authorized switch and housin

This is a preview of the troubleshooting guidance included in the full repair manual.

Common Fixes

  • Trigger lock-off or switch assembly
  • Trigger lock-off and trigger switch

Related symptoms

  • The Trigger Lock-Off Button Is Stuck Or No Longer Blocks The Trigger

    The lock-off cannot be pressed to allow the trigger, does not return, or lets the trigger move without a deliberate lock-off action.

Included in the full manual

  • root cause analysis
  • tools needed
  • step-by-step repair procedure
  • diagrams
  • exploded views
  • post-repair checks

Public pages show a preview only. Purchase the full manual to download complete repair steps, diagrams, and verification procedures.

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