I recently realized that someone had knocked the 5V selector on my soundbridge's multi-volt supply up to 12V, and now the M1001 looks pretty dead. The area around the power connector also smells slightly burnt. I fear the worst, is there anything I can do?
Even if you have fed the unit too many volts, it may still be repairable. The M1001 design includes a protection diode which is designed to protect the rest of the electronics should the input go over-voltage or be reversed. In some cases, when that diode is subject to extremes, it becomes short circuit and burns its plastic casing. IF
that is what happened to your unit, then removal of the diode may allow it to still work from a correct supply. Replacement of the diode will provide further protection for the future. I have one M1001 which I bought as faulty where this had happened. Being handy with a soldering iron and knowing about electronics, I did this myself. The diode is a 5 watt 5.6 volt zener, type 1N5339 - cheap and widely available. Getting to it to replace it requires some care in dismantling your M1001. If you are not inclined to try it yourself, then if you are in the US, sent a PM to Matt (user burkhardi), or in the UK/EU to Pete (user g0pkh). They may be able to help you.