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Likely needs the DSP board replaced. It is the small board held on by 2 screws(if I remember correctly) and is easily replaced. I think retail cost is about $30 and can be ordered directly from Behringer.
The last knob on the right should give 16 different effects, are you saying the knob doesn't work at all? Is it turning smoothly? Do you hear any clicks as you turn it? Is anything plugged into the dsp socket on the back where the footswitch would go?
What makes you think the effects chip is bad? It is LIKELY a fine-pitch DSP that is far beyond what the average tech could do. If you could get one, you would have to take this to a shop specializing in surface mount rework. The chances of this chip being bad is very low. More probable is either pilot error or other circuits, especially those exposed to the external connections.
Hi there,I have the same problem with my flexwave 120. I opened the amp to measure several capacitors on the small effect circuit board. If one of this capaciters have internal short circuit, wich will effect the others causing effects to fail. I removed them one by one to find possible short circuit. All capacitors were ok. I think the problem is in the processor wich is to diffucult to replace. I think it's easier to replace the effects circuit board. But where do we find this board??
This probably an impedance problem. Do you have the manual. If not see if you can get it on line. You can then research the impedance of the input and see if you have a problem. Fender website in support area. Hope that helps. Let me know..
This is a wild guess, but I have had a different model, a 110, that had a bad electrolytic power filter cap on the effects board that while a meter showed 5 volts for the effects, what was happening is there was dips in the unregulated voltage that fell below what the regulator needed and the voltage to the DSP fell to the point that the DSP was resetting at twice line frequency. This was ONLY visible using an oscilloscope. ALWAYS verify your power supplies with an oscilloscope to look for ripple and noise. With the processor continually reset, the unit appeared to be inoperative.
When you are changing the DSP effect on the fly, static or noise is NORMAL !!! The DSP is changing the data and having to recalculate on the fly and doesn't mute itself while doing so which results in "garbage sounds out".
The bypass setting should NOT get any tone UNLESS you have feedback going on. If your guitar can "hear" the speakers in the amp, the strings can vibrate and get feedback going.
Unplug the guitar and see if high freq tone is still there on bypass. If the tone is in the musical range, then there is a problem if nothing is plugged in. If it is a VERY weak, very high frequency tone, this may be the digitizing noise from the DSP. On bypass, the audio is likely to still go through the DSP, just not be modified by it.