Search found 33 matches

by wub
Wed Dec 07, 2022 9:43 pm
Forum: ELECTRONICS
Topic: Mackie 1640i with explosive PSU
Replies: 30
Views: 2352

Re: Mackie 1640i with explosive PSU

The parts arrived for this yesterday so I've had a chance to repair the PSU finally! As for the legs being short, the only one that's a problem is the +tive (You can probably solder the others as they were as they are on the underside) and you could like just use a reasonably sized wire to bridge it...
by wub
Wed Nov 16, 2022 7:37 pm
Forum: ELECTRONICS
Topic: Mackie 1640i with explosive PSU
Replies: 30
Views: 2352

Re: Mackie 1640i with explosive PSU

For large parts like that you need a good desoldering station unfortunately. The fallback is to cut pins so you can just heat and pull out one at a time. Though I think you learned a valuable lesson that brute force isn't going to work. Parts should drop out of the PCB freely if all the solder is r...
by wub
Tue Nov 15, 2022 10:38 pm
Forum: ELECTRONICS
Topic: Mackie 1640i with explosive PSU
Replies: 30
Views: 2352

Re: Mackie 1640i with explosive PSU

I think you might just get away with it, assuming the square pad on the underside matches the square + one on the top, so yes if you can solder on the top it should be fine and the rest, either bend over to make contact with the traces as exxos suggested. You did get lucky there as although the tra...
by wub
Tue Nov 15, 2022 8:45 pm
Forum: ELECTRONICS
Topic: Mackie 1640i with explosive PSU
Replies: 30
Views: 2352

Re: Mackie 1640i with explosive PSU

PSU topside.JPG PSU underside.JPG The PCB is double sided. The track for the positive leg is on the top side, the other three on the bottom side. Could I solder the positive pin on the topside, where there is still something to solder to, and the other three legs on the bottom side? That could be a...
by wub
Tue Nov 15, 2022 8:03 pm
Forum: ELECTRONICS
Topic: Mackie 1640i with explosive PSU
Replies: 30
Views: 2352

Re: Mackie 1640i with explosive PSU

I think I've destroyed the PCB getting the rectifier out :( I removed and tested the C6 capacitor and it measured quite a bit out of spec, should be 0.22uf and it measures at 0.16uf which is more than 20% Because the board had been working it was probably a good sign that the rectifier was ok but I ...
by wub
Mon Nov 14, 2022 4:26 pm
Forum: ELECTRONICS
Topic: Mackie 1640i with explosive PSU
Replies: 30
Views: 2352

Re: Mackie 1640i with explosive PSU

Don't worry, that's basically a sport around here. :lol: lol Sounds like I'm going to fit right in then! ;) As for my PSU, I'm going to remove and test C6 and the rectifier and, assuming that all goes smoothly, I'll see about testing all the adjacent caps to make sure everything is within spec. I a...
by wub
Mon Nov 14, 2022 2:05 pm
Forum: ELECTRONICS
Topic: Mackie 1640i with explosive PSU
Replies: 30
Views: 2352

Re: Mackie 1640i with explosive PSU

It's really difficult. If I had the money and the time, and the confidence in my skills, I would replace everything on the PCB that I could just for the peace of mind. Knowing that the mixer was very likely a fire hazard is a huge concern! I've also got to make sure that when I make a post like this...
by wub
Mon Nov 14, 2022 1:43 pm
Forum: ELECTRONICS
Topic: Mackie 1640i with explosive PSU
Replies: 30
Views: 2352

Re: Mackie 1640i with explosive PSU

I have ordered a new R1, it's R2 that I am going to reuse as it genuinely does seem fine.
by wub
Mon Nov 14, 2022 1:42 pm
Forum: ELECTRONICS
Topic: Mackie 1640i with explosive PSU
Replies: 30
Views: 2352

Re: Mackie 1640i with explosive PSU

Have you compared the layout of the components and where they trace to to the schematics to verify that you have the right thing? Absolutely! The board is very clearly marked up. I'm sure the problem is that I implied that R1 was completely blown. I should have said that it was still giving a readi...
by wub
Mon Nov 14, 2022 1:33 pm
Forum: ELECTRONICS
Topic: Mackie 1640i with explosive PSU
Replies: 30
Views: 2352

Re: Mackie 1640i with explosive PSU

I'm not sure what to say! I must have confused things somehow.. :oops: Although it has three holes blown in it, R1 is still giving a reading of about 20 ohms so it would have been able to function? I mean it did still work after the bang so it must have been just clinging on? After removing R1 and R...

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