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How to solder and fix the Main Relay.
| [Tienes que estar registrado y conectado para ver esa imagen] * For this repair project you will need a main relay and a set of proper tools: Where can I find the MainRelay? [Tienes que estar registrado y conectado para ver esa imagen]Honda/Acura [Tienes que estar registrado y conectado para ver esa imagen] Acura [Tienes que estar registrado y conectado para ver esa imagen] Honda/Acura
Start by carefully prying the main relay: Clip----->[Tienes que estar registrado y conectado para ver esa imagen] Stick a flat small flat screw driver in the crack.
Note: Do not stick the screw driver too deep inside. You may damage the relay's mechanical or electrical parts. [Tienes que estar registrado y conectado para ver esa imagen] Fig. 4 The image above shows one good and several bad examples. More soldering examples (external link.) Examples: [Tienes que estar registrado y conectado para ver esa imagen] The amount of solder (before) is too little. The joint (before) is a cold solder joint.
[Tienes que estar registrado y conectado para ver esa imagen] Desolder the inadequate terminal (1) and the faulty terminal (2). (same as fig. 12 above.) [Tienes que estar registrado y conectado para ver esa imagen] Desolder using a pump [Tienes que estar registrado y conectado para ver este vínculo] Desolder using a wick [Tienes que estar registrado y conectado para ver este vínculo] [Tienes que estar registrado y conectado para ver esa imagen] Desoldering using a desoldering iron. ↓ [Tienes que estar registrado y conectado para ver esa imagen] 1.) Press and hold the air vacuum bulb. Apply the desoldering iron tip so that the terminal penetrates within its orifice. 2.) When the solder liquefies, start gently to rotate the desoldering tip so that the component’s terminal can be eased away from the sides. 3.) Release the air vacuum bulb just long enough to suck the solder. Note: If any solder remains are left on any terminal after attempting to desolder it, resolder it with fresh solder and repeat the desoldering process. A clean removal should look like this: [Tienes que estar registrado y conectado para ver esa imagen] NOTICE:
[Tienes que estar registrado y conectado para ver esa imagen] Heat the terminal and the copper trace with the iron tip while applying the rosin core solder to the terminal. [Tienes que estar registrado y conectado para ver este vínculo] If you do have a joint which looks in need of rework don't be tempted to just reapply the iron. This is unlikely to succeed as the solder in place will have no flux in it, so the flow across the joint will be worse than when it was first made. Better to remove the solder, using a desoldering pump or copper braid, and make the joint again. The flux's job is to strip away all of the grease from the surfaces to be soldered, thus ensuring that the solder will flow properly. A concave should be formed with an angle of 40 and 70° from the horizontal. † Click here if you still have trouble creating a perfect joint. A good solder job should look like this: [Tienes que estar registrado y conectado para ver esa imagen] (Optional) Clean with steel wool, inspect for imperfections then use a conformal coating material. Conformal coating enhances performance, improves electrical stability as well as accidental shorts and thermal shock. Their ingredients include varnish, epoxy, parylene, polyurethane, silicone, acrylics, or lacquer. Coatings are applied in a liquid form; when dry, they exhibit characteristics that improve reliability. These characteristics are:
[Tienes que estar registrado y conectado para ver esa imagen] Install onto the vehicle in a lower, practical location[Tienes que estar registrado y conectado para ver este vínculo], easily accessible in the future. Your work is done. [Tienes que estar registrado y conectado para ver esa imagen] See all locations >> Further explanations: [Tienes que estar registrado y conectado para ver esa imagen] What causes the main relay to fail? Short answer: The term 'cold solder joint' best decribes it. This develop over time with thermal cycling on parts that are not properly fastened and are essentially being held in by the solder alone. They may flex the connection due to vibration or thermal expansion and contraction. More info at FAQs page.
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