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Think this is repairable?? ZX475 blown transistor
Posted: Thu Mar 10, 2016 11:34 pm
by bikergreen
Re: Think this is repairable?? ZX475 blown transistor
Posted: Fri Mar 11, 2016 5:58 am
by Eric D
That can be fixed, but it will be quite a bit of work.
Re: Think this is repairable?? ZX475 blown transistor
Posted: Fri Mar 11, 2016 8:37 am
by bikergreen
Eric D wrote:That can be fixed, but it will be quite a bit of work.
That was my thought as well. Hoping to get some tips on steps and what else to replace etc. I have the ability but don't know enough about PCB repair.
Re: Think this is repairable?? ZX475 blown transistor
Posted: Fri Mar 11, 2016 12:08 pm
by Eric D
-Remove any bad parts first
-Clean the board as best as you can
-Take photos of the area
-Cut out the bad part
-Make a patch using raw copper clad pcb, and the photos you took
If you don't know where some traces went, others on this forum, may have amps they can help you get information from.
Re: Think this is repairable?? ZX475 blown transistor
Posted: Fri Mar 11, 2016 11:10 pm
by Mr. Wild
Obviously that 8 fet power supply can deliver some serious current! Even the buss bars are warped from the heat

Re: Think this is repairable?? ZX475 blown transistor
Posted: Fri Mar 11, 2016 11:30 pm
by vwdude
That looks very familiar...I had an amp with very similar damage. I repaired it and it tested fine for me but when I sold it the new owner had issues so he ended up scrapping it.
It's a worthwhile amp to practice on. If you have luck fixing it then you'll have a great amp, if not then at least the case is salvageable. You can find a rusted out amp and take the board for your case and voila, a good amp again.
Check out
www.phoenixgoldregistry.com
Re: Think this is repairable?? ZX475 blown transistor
Posted: Sat Mar 12, 2016 5:42 am
by trickyricky
Give it a try....if you fail don't worry or get bummed about it. Scrap it, I would be interested in the xover board for sure as I need those hard to find RCA's. The case is also neat to keep, nothing is trash.
Re: Think this is repairable?? ZX475 blown transistor
Posted: Sat Mar 12, 2016 10:09 am
by bikergreen
trickyricky wrote:Give it a try....if you fail don't worry or get bummed about it. Scrap it, I would be interested in the xover board for sure as I need those hard to find RCA's. The case is also neat to keep, nothing is trash.
Ya thats what I'm thinking, not to worried if it doesn't work out as I have another one coming

- have plans for the case and other things already. Fun to take it apart and experiment.