A Kantare ship stranded on a desolate planet was equipped with optronic relays that were starting to malfunction. Trip Tucker helped repair the relays. (ENT: "Oasis") When Dukat wanted to turn on the holofilters on his Klingon Bird-of-Prey as the ship was flying to Ty'Gokor, the holofilters didn't work since the optronic relays were fused. (DS9: "Apocalypse Rising") A short time later, an optronic relay broke again, this time in the device Worf used to make Quark look like an accomplished bat'leth fighter when he was courting Grilka. (DS9: "Looking for par'Mach in All the Wrong Places")