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Post subject: Mustang II shutdown problem solved.
Posted: Sun Jan 27, 2019 12:56 pm
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My Mustang II amp was blown. It would start for a few minutes then shut down. Took a look at the printed boards, traced the line to the transformer and rectifier board. One of the secondary transformer's pins became unsoldered. The small solder to board footprint caused excessive thermal cycles that eventually caused the solder to liquefy and subsequently oxidize in the peripheral contact areas. Carefully cleaning the affected area, then scrapping a larger footprint for the solder on the printed board and finally re-soldering the pin will permanently fix this problem. Hope this helps. I tested the amp for eight hours and she's a beauty.


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Fender Cyber Monday 2019
Post subject: Re: Mustang II shutdown problem solved.
Posted: Mon Mar 18, 2019 4:12 pm
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strat1961 wrote:
My Mustang II amp was blown. It would start for a few minutes then shut down. Took a look at the printed boards, traced the line to the transformer and rectifier board. One of the secondary transformer's pins became unsoldered. The small solder to board footprint caused excessive thermal cycles that eventually caused the solder to liquefy and subsequently oxidize in the peripheral contact areas. Carefully cleaning the affected area, then scrapping a larger footprint for the solder on the printed board and finally re-soldering the pin will permanently fix this problem. Hope this helps. I tested the amp for eight hours and she's a beauty.

Good job, thanks for the info!


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