Question about Fender Mustang II 40 Watt Electric Guitar Amp
IN this Mustang II, The power goes off when the sound(volume) is increased . I ve checked for burnt n shorts but its clean,I suspect the output I.C TDA7294 is faulty,shall i replace the I.C check some thing else. Can anyone help me with it .
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Posted on Jan 02, 2017
SOURCE: Fender bass guitar shorting out
it sounds to me that you need to fix the input on the bass (where you plug in), sometimes just tightening the nut will do it, or buying a new one and replacing.
Posted on Jul 22, 2009
These are a real pain to open. You have to remove the front panel to remove a shield to remove the back amplifier power supply area. The power supply is a switching type and has lethal voltages present. Working on this should be done using an isolation transformer. With your symptoms, it is likely one side of the power amp MAY be blown, but do check that the wiring hasn't fallen off and the jack itself. Two pairs of wires come from the power amp to the front panel jacks. document location of ALL the cables you disconnect as they CAN be confusing to restore.
Posted on Jul 26, 2009
More than likely a bad solder joint. Where is the next question. How confident are you with voltage measurments? The rails in tube amps are high and can kill you so if you are not inclined to do so please don't. The reason I suspect a solder joint is that it is a failure over time, cold solder joints expand and contract with heat. When they heat up they break connection. Not saying 100% that is your problem but it is very likley.
Posted on Dec 14, 2009
Testimonial: "Hey thanks for responding!...I am not savy at this so I will take it to an expert before those tuibes blow on my face. Thanks again!"
There are FOUR controls that affect the volume of signals going through plus the tone controlling ones.
You used the word "volume". Based on the schematic, and assuming you are talking about the control labeled "Volume" and not reverb, master or drive, I can give some hints.
OFTEN the resistance element in pots MAY have a bit of overtravel which can act like your unit, but USUALLY not as far upscale as yours appears..
If the control you are refering to is not the "Volume" but one of the others, then there are other things to look at.
The action you describe would be one of probablly an inverse signal leaking through and when you go up to 1.5 you are actually cancelling the leakage.
I SUSPECT you may have a cracked circuit board in the vicinity of the input jacks that is leaking the inverse phase of the input past the input triode tube stage.
Board cracks OFTEN occur near input jacks because people trip over cords... (save yourself by running cord through a handle before plugging in the plug)
This should be easy to find. Connect an audio generator to the input and use a scope to find the problem. Without a scope, use a capacitor to "ground out" suspected signal paths.
On the schematic they show a resistor (10 ohms) from ground near the input to the pot bracket. I have personally SEEN capacitive coupling to pot brackets feeding into the amps from this source sending in stray signals.
If this is connected to other equipment, a ground loop could cause problem, so test with nothing but the guitar connected.
Posted on Apr 30, 2010
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