Dit instrument miste de connector voor de externe voeding. Een probleem met de aan/uit knop, een batterij probleem en iemand had het nog wat erger gemaakt door de antenne te beschadigen bij een reparatie poging. Ik heb de antenne gerepareerd, de aan/uit knop gemodificeerd, de soldeerpads van de connector vervangen en het BMS van de … Lees meer
These burned things began their lives as resistors. The problem is the pcb is fried too. First step, make pictures and a sketch and then I mill away the burned section. Then I make an insert and glue that in. I connect the new pads to the rest and cover it with pcb coating And … Lees meer
Tĥis is the pcb from a G&M Secutest. It was not working like it should. The problem turned out to be some vaporized traces inside the 4 layer pcb, a LM358 with ventholes, a dead 555 from the boost converter, a dead TL082, a burned inductor, a blown fuse and 4 bad relais. The … Lees meer
This one had a few fried resistors due to a short caused by damaged isolation from a wire. I first removed the resistors. The picture above is after cleaning with IPA. The pads are loose but not damaged. The black stuff is burned epoxy. You can see the structure from the, now epoxy-less, FR4 glasfiber. … Lees meer
Fluke uses a resistor divider to tell the processor in what position the switch is. It is made from a sort of carbon film. At the picture above you can see it. This meter has also a problem with a partial dead IC so a nice victim to practice my PCB transplanting skills. … Lees meer