Repair of a Cyrus Power Amplifier that's lost its Marbles!

Here we have a Cyrus Power Amplifier model 'Power'. One of the early stereo/mono amplifiers.
It wasn't powering up and had been to a repair house previously. We find that its been butchered and has multiple problems including a dead micro-controller(marbles).
This would normally be terminal but in this instance I decided to re-create the function of the controller using an Arduino. Some further debugging of the main board and we are back in tune!

[@ashleycox432]

doesn't surprise me that a service centre made that mess, name and shame. Finding reputable, honest, knowledgable service techs who know what they're doing is a real challenge. I always took my ability to solder and work on things for granted and now that I can't in the short to medium term, and the stuff is piling up, I know how the less technical people feel. Fantastic work substituting the microcontroller with the Arduino, a great way to repair an otherwise junk unit.

[@ChrisTaylor-sr2sf]

Fascinating stuff sir, way beyond my comprehension but nevertheless it just shows what can be achieved with your knowledge. I shall certainly give you a call when my mono x's require attention.

[@adz300107]

You never fail to amaze me with your expertise with Cyrus products. Even more so when you consider schematics are not available for most of these products and so a lot of time must go in to reverse engineering them.

[@jasejj]

Very impressive that... I have a degree in electronics but I'm not sure I'd have even thought about approaching that one, would have assumed it was a lot less logical than it turned out to be. Of course this is a British design and they did tend to keep things simple like that - the Japanese would have spun up a custom IC with 240 pins that did the job of an entire range of devices and you'd have had no chance lol.
That mess though... I consider myself very much an amateur when it comes to audio stuff but there's no way I'd have been happy to let that out the door, it looks like a curious twelve tear old was let loose on it!

[@derekpaisley620]

Well done!, you got me worried now, i have had a cyrus 3i laid up i bought some years ago that I haven't got round to sending it off to get fixed. I didn't know about the micro controller

[@pantofaru]

Hi, where we can find you if we need repair service? Thanks

[@myalbatech]

[e-mail]

[@PaulSmith-un9gt]

@@myalbatech