Perhaps the most annoying kinds of faults are those that involve expensive equipment that just sit around in a cupboard, only for them to just stop working at all. Fixing an Expensive Amprobe Cable Tracer With Mystery Fault. Such was the case with the ยฃ2,000 Amprobe cable trace kit that [Tom] bought for work-related purposes.
After sitting around unused for a few years, the signal generating part of the kit refused to power up at all, with Flukeโs service department wanting at least ยฃ600 to even attempt a repair after already having had [Tom] cough up ยฃ70 to even get this quote. Later he instead sent it to [Buy it Fix it] on YouTube for an attempted repair, which at the very least would be a less costly option. These systems use a signal generator connected to the cable, with a separate detector wirelessly tracking this signal.
By itself that doesnโt sound too complex, but as it turns out it wasnโt quite so straightforward to diagnose. After eliminating a basic power or display issue, the SoCโs boot sequence was traced, including reading from the 128 MB NAND Flash. At first glance the unit appeared to be trying to boot and work as normal, which was confirmed after finding a serial port and seeing the log output on it.
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