How to Repair Model Railroad Transformers

You've set up that old electric train set that has been sitting in your attic or basement only to discover the transformer doesn't work. You can get a new one or have someone repair it for you, but both of these options can be costly. With a little bit of patience and skill you can save yourself some money and do it yourself.

Instructions

Difficulty: Moderate

Things You’ll Need:

• Spare Wires
• Wire Strippers
• Oxidation Remover
• Soldering Gun
• Solder
• Tweezers
• Screwdriver

1. Determine what needs to be repaired by plugging in your transformer. If you can hear a sound from the transformer, but the train does not move, the contacts on the track need to be replaced or cleaned.
2. Unplug the transformer if it appears to be dead and use a screwdriver to dismantle it, making sure you're well grounded and any excess charge in the transformer has been dissipated.
3. Look for wires that are disconnected, loose, green-tinted or whitened (which indicates they're oxidized).
4. Use a soldering gun to reattach any disconnected wires.
5. Use a soldering gun to detach any oxidized wires and remove any excess solder that may be on the wires.
6. Place the wire tips into an oxidation remover and wait several minutes. Remove the wires and wipe them with a soft towel. Allow the wires to dry completely, then use a soldering gun to replace them inside the unit.
7. Replace any frayed wires and solder them into place.
8. Check the AC/DC output of the transformer. If you get a low or no reading, replace the plug.

Tips & Warnings

• Keep a small bag or tray near your work area so that you can place your loose parts in them to avoid losing them.
• Make sure you are grounded when working on a transformer. They are electrical devices and may still hold a charge.