This instrument had a missing power supply input connector, a problem with the power button , a battery problem and someone had been inside it and killed the antenna. I repaired the antenna, modified the powerbutton, rebuild the solder pads of the power supply connector and fooled the BMS to get it out of sleep mode.
Not something you see everyday, these calibrators are pretty expensive and the problems are fun to repair.
https://youtu.be/nFQxVm6fIdg
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