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Because I get more and more secutest for repair, I experimented with several fixtures. Secutests are a pain to work on because there is no room and there are dangerous voltages inside. There is a PCB with big relais: This is one of the many versions. The PCB hangs upside down in the cabinet. The … 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
A peltier powered dryblock from Isotech that stopped working. There was no current flowing to the TECs (peltier elements). That can be caused by a dead controller, dead PSU or dead TECs. They should have a very low resistance so that is easy to test first. I measured a few megohm. The once used here should … 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
This Megger is one that is made to measure milli and micro ohms. It uses a 2A current for this. The meter part uses a ICL7107, a multimeter IC that is around for many years. It is f.i. used in the Fluke 8020. It was dead but not a problem because they still make it. … Lees meer
This tester is made unchanged for many many years. It can deliver 5kV and do 100mA. This unit was as dead as an instrument can be. The biggest problem was the power supply transformer that was dead. it has several windings including 2 that are over 2500 turns. Both of them where burned open. That … Lees meer
Repairing calibrators is always fun. This one had no output. It has the 120mA option but that was dead too. The fuse was blown, a logic-opto and a p-channel jfet were dead. The IC caps had a very high leakage current. The jfet was obsolete but I found a usable substitute. The only problem was … Lees meer
A Fluke scopemeter made in 2010. It stopped charching and turning on resulted in a few seconds before it switched off again. A new battery did not solved the problem and that is why it arrived here. According the owner it always had some problems. The psu is nothing more as a transformer , diodes … Lees meer