![]() A rotary tool grinding bit, held in your hand, is a good tool to gently scrape away resist in a controlled way. You can use the cutting tool to carefully scrape away at least 3mm length of the overcoat material. Otherwise you risk lifting up the remaining trace and/or contact.īefore you can add a jumper, the conductive surfaces must be exposed at the point of the break. Before pulling off the damaged trace, double-check that your cut is complete. Whenever possible, this repair should be made at least three millimeters away from contacts that will later be soldered in order to minimize the chance of reflowing the repair. The damaged trace should be cut away and removed using a cutting tool, being careful not to damage any surrounding traces, components and contacts. STEP 1: Scrape away resist from repair areas. Any content that diverges or supplements the IPC standard with be noted on the graphics, and text will be blue. ![]() The graphics and text have been created to provide easy-to-use instructions. Purchase the full standard from the IPC organization. Cut this trace to the approximate length needed to connect the existing conductors on the board. The replacement trace may be cut from a copper sheet. Most traces have a thickness of one ounce per square foot (1.37 mils). Note: This guide is based on the IPC 7721 4.2.2 standard. Choose a copper replacement circuit trace that is the same width and thickness as the damaged trace.
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