- Flyback replacement on a historical arcade machine. - 2 Updates
- Mark Bass ,CMD 102P, bass amp of 2011 - 1 Update
| Top Cat <thomas.is.topcat@googlemail.com>: Jun 11 06:43AM -0700 Thanks for all the chat. The flyback had smoke emanating from the point where the cable comes out. I switched it off and am trying to find information on what I should and shouldn't be doing to repaid the chassis pcb. |
| Top Cat <thomas.is.topcat@googlemail.com>: Jun 11 08:19AM -0700 > Retrofitting the wrong fly in there can be tricky. You will need a variac. Also probably a selection of capacitors. And then you might have to install a regulator to get the HV where it needs to be. > In this case, since it is probably reactive scanning, the vertical sweep will tell you when you got it right. You are playing with the horizontal so you can't count on that. > This can be done, it is just a matter of how much time and trouble it will take. That's super advice and well advanced. I am clearly in over my head. I will start reading and learning more on the subject, before I attempt to fix it. I really do want to keep it original for the sake of preservation. I'm not trying to make a buck or just to play the game. I'm exited to bring it back to life. ...One day. |
| N_Cook <diverse@tcp.co.uk>: Jun 11 04:12PM +0100 On 12/05/2016 14:56, N_Cook wrote:> Owner switched on, blue led came on as normal , but between that and 20 > I don't like the great thick slabs of ceramic insulator pads, should be > used on bathroom splash-backs IMHO , not heat conductors. > The main amps not checked over yet. I've now got all the full-rated replacement parts, and will be replacing in steps. In place of the ground off marking driver, IR2153 is working in there with 2x expendable sacrificial cheap IR740 pwerfets in there, running 60% then up to 80% of mains, wiht the 2 main PA power rails isolated. So again the only? Mark Bass circuit out there has pins 1 and 4 swapped over, deliberate disinformation to go with grinding off business. Next step will be to remake those rail connections to the original 2x2 audio powerfets and run at 60% up to 80% mains. Then what is the next step, add the 2x 200V rating n and p audio powerfets plus minor mods again at 60 to 80% mains then replace the IR740, or replace the proper smps 600V powefet pair and go to 100% mains and original 4 audio powerfets, then add the 2 replacements and mods? |
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