First Power-Up Checklist: Don’t Let the Smoke Out

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The first time you plug a battery into a new build is the most dangerous moment for your electronics. One solder bridge can destroy an ESC in a fraction of a second. This checklist takes ten minutes and saves far more than that in parts.

Before any power is connected

1. Props off. Always. Every test in this checklist is done without props.
2. Visual inspection under good light. Look at every solder joint with a magnifier. Check for stray solder balls, whisker-thin strands and joints touching their neighbors.
3. Check for loose debris. Shake the drone gently over a white sheet. Tiny metal flecks can short a board.
4. Check motor screws. Make sure no screw touches a motor winding.
5. Check capacitor polarity. The stripe on the capacitor marks negative.

Multimeter tests

Set your multimeter to continuity mode (it beeps when two points are connected).

1. Battery positive to negative: touch the probes to the two XT60 pins. It may beep for a moment while capacitors charge, then it should stop. A steady beep means a short. Do not plug in a battery. Find the short first.
2. Each motor pad to ground: no continuity.
3. 5 V and 9 V pads to ground: no steady continuity.
4. Each motor’s three wires: should read low resistance between each other through the motor windings, and no connection to the frame.

The smoke stopper test

1. Plug a smoke stopper between your battery and the drone. Shop smoke stoppers
2. Connect the battery and watch the stopper’s light or fuse.
3. A brief flash is normal. A bright, steady light or a tripped fuse means too much current is flowing. Unplug and inspect.
4. Listen for the ESC startup tones. The motors should beep.

USB checks before the first battery flight

1. Connect the flight controller to Betaflight or Mission Planner by USB.
2. Check the 3D model moves the right way when you tilt the drone. If not, fix board orientation.
3. Check the receiver tab: sticks and switches should move the right channels.
4. With the battery connected (through the smoke stopper) and props off, test each motor. Confirm position and spin direction.
5. Check the voltage reading matches a multimeter reading of the battery.
6. Check the VTX power is set appropriately and you’re on a legal channel.

First hover

1. Remove the smoke stopper. It limits current and the drone can’t fly on it.
2. Install props in the correct direction.
3. Go to an open field, away from people. Place the drone about five meters from you.
4. Arm in Angle mode and hover low. If anything looks wrong (shaking, drifting hard, flipping), disarm immediately.
5. Land after 30 seconds and touch each motor. Warm is fine. Hot is not. See troubleshooting.

Print this short version

• Props off
• Visual inspection
• Continuity: battery + to –
• Smoke stopper on first plug-in
• Orientation, receiver and motor checks
• Voltage reading matches multimeter
• Smoke stopper off, props on, hover test

Understanding what a short looks like

A short circuit is any unintended path between battery positive and negative. On a drone, common sources are:

• A solder bridge between two pads.
• A stray wire strand touching the next pad.
• A motor screw touching a winding.
• A capacitor installed backward.
• A crushed wire touching the carbon frame.

The battery can deliver hundreds of amps into a short in an instant. That’s why the multimeter and smoke stopper steps exist.

Reading the smoke stopper

When the ESC doesn’t beep

• Check the battery is charged.
• Check the battery lead solder joints.
• Check the smoke stopper isn’t tripped.
• Check the ESC’s power LED, if it has one.
• Make sure the motors are connected; ESC startup tones play through the motors.

Make it a habit

Run this checklist after every repair that involved soldering, not just new builds. A quick check after replacing a motor or VTX catches the same mistakes that cause problems on new builds.