I have an Fanuc OM machine with an A06B-6058-H302 servo amp. The break resistor overheats fairly sporadically, usually something I notice by the smell or by a bit of smoke appearing if I have the cabinet open. I also sporadically get a "not ready" alarm with no associated alarm code.

Are there common causes of this that can be repaired?

If I need to pursue a new servo amp, do I need the exact same part number, or for instance will a -H304 drop in? Any pointers towards part number references would be appreciated.

Thanks!

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