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Post subject: Mustang GT-100 or 200 parts
Posted: Sat Jan 26, 2019 1:56 pm
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My GT-100 stopped working because of a bad power supply. It was purchased used so there's no warranty on it. Fender does not carry spare parts for any of their Chinese made products and so I'm looking for someone who might have a broken GT-100 or 200 that is willing to part out the power supply circuit board. If anyone has any other suggestions feel free to share them.


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Fender Play November 2019
Post subject: Re: Mustang GT-100 or 200 parts
Posted: Sat Feb 09, 2019 2:39 am
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Location: Province de Québec, Canada
Why issue on power supply ?
If you don't fix the issue, new PS may burn too .

You can't fix the power supply ?


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Post subject: Re: Mustang GT-100 or 200 parts
Posted: Sat Feb 09, 2019 8:31 am
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If it IS the PS, chances are good you can find a part for it because most PS parts will not be proprietary. You should be able to find them at any electronics supply. That said, the problem you may run into is no schematic if the part is burned to the point that any value designators are burned away or even if not burned they may not have a value on them. Chances are good you will be able to tell tho one way or another tho. Where u will run into issues is when parts that are proprietary or even if not, parts that may be hard to find one that fits. The data wheel comes to mind. You may be able to find one that will work electronically, but the legs may not match u with the circuit board and finding one that does may be tough.

If you are good at jury rigging things and figuring out parts values and type thru experience tho, you should be able to fix most anything in it. Just depends on what it is because some things will be some and some will be impossible and everything in between. This is the issue with cheap electronics today They are made to throw away and get a new one when they go bad. In the case of fender they call them "non field repairable" meaning the do not carry parts for them and their service centers are not authorized to repair them. They give you a warranty and if withing the warranty period they go bad u bring it to a service center and they check it to make sure it is malfunctioning then they have fender deliver you a new one. After the warranty period you're out of luck. On the somewhat brighter side, they are cheap enough that buying a used one should cost no more than a repair would if they did repair them. We live in a very different world today when it comes to electronics.


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Post subject: Re: Mustang GT-100 or 200 parts
Posted: Sat Feb 09, 2019 9:26 am
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Aspiring Musician
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Unless you are a well equipped shop with an experienced technician, troubleshooting a switch mode power supply is a fools errand.
To start with, a smps will shut down when there is an amplifier fault. It takes an oscilloscope to determine whether you have a blown supply or if its just going into protect. You can't disconnect the amp from the supply because it will shutdown without the proper load. Its a real chicken and egg problem to troubleshoot.
Smps are hardest on the electrolytic capacitors because of the high frequencies involved. Cap checkers won't go up to the frequencies that smps go up to. The cap may read good, but still not work in the circuit. Replacements must have similar ripple current capabilities or they won't work right either.
This is the limiting factor. You won't find any of these amps as time goes by. Once the high frequency caps wear out, its ready for the landfill.


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Post subject: Re: Mustang GT-100 or 200 parts
Posted: Sat Feb 09, 2019 4:28 pm
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Maybe you could find out what the supply output was, then find a replacement with the same voltages and current ratings. There's plenty of room in there to fit something different to the original.


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Post subject: Re: Mustang GT-100 or 200 parts
Posted: Sun Feb 10, 2019 11:07 am
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Aspiring Musician
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Yes, you might find something to fit. but as I said, the power supply may be shutting down for an amplifier fault.
If you want to do something like that, I would get an ICE module. It has the amp and power supply in one module. They come in various wattages and probably sounds much better than the stock amplifier. instead of a Class D PWM output, they are a Class AB, sort of. The class H specifies a rail voltage that tracks a few volts above the output voltage. These modules are used in many subwoofer applications and several guitar amps. They are @$150 and are easy to design around.
The modules have 125VAC inputs with speaker terminal outputs. They have +-15 offboard power available for preamp circuits, but you would have to come up with a 5volt supply for the digital section.


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Post subject: Re: Mustang GT-100 or 200 parts
Posted: Sat Feb 16, 2019 2:30 pm
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Billmp - What made you think it's the power supply? Does anything light up but no sound? What was happening right before it stopped. Those answers will help determine your odds of going for an affordable repair. If I hear a bit about the before and after it helps diagnose if even a bench check is worthwhile. Also, are you an open it up and inspect inside it guy with enough knowledge to be able to identify the Power section and parts on the main circuit board?


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