Diagnosing a dead 3D printer controller

This is a faulty control system that was sent to me by Bjorn. When his new printer failed the supplier simply sent out a complete new pair of control boards as it was the cheapest way to guarantee a fix.

The system is completely dead unit with the display pulsing briefly at power up and drawing a high supply current.

Many of the modern units take a modular approach to allow swapping out specific sections of circuitry. It's often faster and cheaper to just swap in spare modules until the unit starts working again. But in the case of specialist machines or obsolete equipment it's useful to be able to diagnose a fault to component level.

It's easy to forget that things like 3D printers and cutting lasers used to be very expensive industrial machines. They've become so popular that you basically have a full blown industrial machine on your table.

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