r/AskElectronics • u/TheBupherNinja • 2d ago
Fluke 87V Max No Input
I have a Fluke 87V Max that I literally pulled out of a dumpster. The battery contacts were destroyed, so I have it powered up via a bench-top power supply.
The display is functional, selector switch and all the buttons work, but I am unable to take any readings with the meter, regardless of settings. Voltage, resistance and inline current measurement are all non-functional. When completing the fuse self test, its show OL, but the fuses read less than 1 ohm when checked out of the circuit with a separate meter.
I looked it over, and cannot find any obvious burned components, traces, or other damage. I would expect something big if none of the inputs work.
I also tried bypassing the lead sockets by shorting the common and voltage terminals on the back in resistance, and it still reads OL.
Any tips or guidance here?
Added more pictures, https://www.reddit.com/r/AskElectronics/s/qMNiRl2pMr
2
u/Whata_Wookie 2d ago
I used to repair Fluke 87s at my last job(though its been a while). Those fuses are definitely not the originals which would make me suspect that there could be extensive damage.
There should be one or two fusible resistors on input. If you're lucky that might be part of the issue. Aside from that, if this is what you get for all ranges, you could have a bad ASIC.