How to Replace Diodes
Rectifier diodes are active electronic devices that allow electrical current to flow in one direction only. Consequently, when a diode is replaced in an electronic circuit, original diode polarity must be observed. Diode polarity can be determined by observing which electrical lead has a line marking next to the lead. This line identifies the cathode connection, which will allow for proper diode replacement.
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Instructions
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Turn off the electronic circuit power supply, if one is present in the electronic circuit. Note which electrical lead is connected to the cathode (diode terminal with the line). Snip the cathode lead and apply heat with the soldering iron to the snipped wire attached to the circuit. Pull the lead wire out of the electrical circuit.
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Insert the replacement diode cathode lead into the electrical joint where the failed diode cathode lead was removed. Solder the cathode lead to the electrical joint.
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Apply heat using the soldering iron to the failed diode anode lead; pull the failed diode out of the electrical circuit. Attach the anode lead of the replacement diode to the electrical joint that the failed diode was removed from; solder the electrical joint.
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Tips & Warnings
A soldering iron and electronic solder aren't necessary if the original diode wasn't soldered to the circuit. If the original diode wasn't soldered in but was attached electrically in some other way (such as using wire nuts or a twist splice), the replacement diode can be attached to the circuit in the same fashion.
