Opener will not run; diagnostic LED flashes nine times repeatedly; sometimes accompanied by a burning smell previously.

Safety first: Turn off power at the breaker and unplug the opener. If you smell burning or see smoke damage, do not attempt repeated operation.

Steps to diagnose power supply fault:

• 1. Check external power: Verify the outlet has power by plugging in a lamp or tester. Reset any tripped GFCI or breaker.
• 2. Inspect internal fuse: Remove the opener cover and locate any inline or board-mounted fuse. If blown (broken filament or blackened glass), replace with the same type and rating. If it blows again immediately, there is a deeper fault.
• 3. Examine transformer: Look at the low-voltage transformer on the board or chassis. Signs of overheating, melted insulation, or humming with no output indicate failure. A technician can test secondary voltage with a multimeter.
• 4. Look for board damage: Inspect the logic board for burnt traces, bulging capacitors, or cracked solder joints. These are signs the board should be replaced, not repaired in the field.
• 5. Replace logic board or opener: For older Stanley models, replacement boards may be limited. If a compatible board is available, install it per the wiring diagram. Otherwise, consider replacing the entire opener with a modern unit.