A couple of weeks ago I plugged in my BBC Micro Model B and it went up in a plume of smoke.
Unfortunately, the 30 year old machine had undergone one of the most common failures. A capacitor that had been sitting there all these years failed, burst open, emitted smoke and leaked all over the circuit board.
Today, I repaired the damage. This blog post is for anyone who faces the same thing.
To fix the damage I replaced three capacitors that are likely to die over time (including the one that had burst) using a kit costing £2.70 from this site and a copy of the BBC Microcomputer Service Manual.
The first step is to remove the power supply from its case. This is carefully described in the service manual (including two cable ties that need to be cut and replaced). Here's the supply without its case. I've marked the three capacitors to be replaced.