Quick triage: When splices start failing, work through these checks in order: (1) re-clean the fiber, (2) advance/replace the cleaver blade, (3) clean the v-grooves, (4) run arc calibration, (5) verify the splice program matches the fiber type, (6) inspect or replace. Quick triage: When splices start failing, work through these checks in order: (1) re-clean the fiber, (2) advance/replace the cleaver blade, (3) clean the v-grooves, (4) run arc calibration, (5) verify the splice program matches the fiber type, (6) inspect or replace. Fibre fusion splicers are critical instruments in modern optical fibre installation and maintenance. These precision tools align and fuse optical fibres together using an electric arc to form a single long fibre. Fiber optic fusion splicers require precise operation. While the Sangken Splicing machines are designed for high-precision work, even the best equipment requires proper troubleshooting when splices fall outside of. Cleaning Fiber Ends: Effective Techniques Against Contamination Even dust, ash, or oil at a microscopic level can greatly degrade the quality of the splice. Therefore, clean the fiber ends quickly and thoroughly. New, lint-free wipes soaked in 99%+ isopropyl alcohol are preferred for cleaning fiber. The fusion splicer flags every kind of problem with its own visual signature, but the troubleshooting is the same: identify the defect, find the root cause, fix it, and re-splice.