Thank you for the reply but this is different to mine. It seem like mine is a BOC Autolynx 2 (possibly) I don't know what age it is about 1980s id say. It has a serial number 8M151 on the back but matches the pictures of some welders on this Forums! I have asked a couple of guys on here if the have any info to help.
Well done eddie. I've been telling people this for years - check the soldered joints every time! I have repaired so many of these machines by using a magnifying glass and a soldering iron. Probably only fitted 3 new components in all my years. But still folks insist on changing transistors/resistors/etc first. These PCBs were well designed, made with good quality components, then soldered incredibly badly. Shame really... Dave