Behringer V Tone GMX212 2X60 Watt Stereo Guitar Combo (Standard) Logo
Posted on Jul 05, 2011
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No functions on the front panel..the display does not change....all voltages to boards present and correct....any ideas?..it belongs to a school....i am a service engineer...but cannot solve the problem...can you help?

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  • Fred Yearian Feb 08, 2013

    Another CHRONIC problem is bad ribbon cables in these and the G110 product try wiggling the ribbon near each connector. If something changes, get new cables or connectors and squeeze a new connector on each end.... watch the direction of the connector before squeezing it on.

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If the front panel is out, at least one can still use the power amp of the GMX212... On the back panel, the "SLAVE IN" inputs are 2 mono jacks, left and right, for stereo input. Plug in the output of an effects pedal or a preamp here and it will be amplified in stereo through the speakers, which are made for guitar sound.

The same can be done via the "TAPE IN" RCA-composite stereo inputs

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  • Posted on Jul 05, 2011
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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.

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