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How can i find if one of my channel not working

One channel not working in my amp

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Apply a music or tone source to each input one at a time and see if signal comes through.

If you have 2 channel output, when the music or tone is on an input, switch it between the 2 outputs. It may just be dirty swith contacts, fader contacts, dirty or damaged interupt contacts on the jacks, or even the wrong length if using unbalanced or balanced 1/4 inch plugs.

If one channel is dead, you use a scope on the chassis at each amp IC chip/stage to see where it drops out. Even without a schematic you can loctate the 4558 IC's or the TL074, TL072, or TL071 inputs and outputs on their respective data sheets and use those to navigate the audio stages in the chassis.

Posted on Oct 29, 2012

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Then you either have a blown amp or speaker. Turn the amp off and move the wires from the speaker on the working side to the other speaker. If the other speaker works, you have a dead amp channel. if it does not, move the wires from the speaker on the non-working side to the other speaker. If that works, you have a dead speaker. Dead amp channel means take it to the shop. Dead speaker means buy a new one from Line 6 and install.

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My behringer pmp3000 doesn't seem to have much power to use my two peavey 12" speakers and use a mic. I have to push the gain and faders up more than I think I should have to, to get a decent level of...


Where do you have the gain control set on the Mic channel ?
If you have no issues with either the speakers or the Mic, and the gain control for the channel you have the Mic plugged into is set at a somewhat "normal" position, you might have a problem with the mixer itself.

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I have same problem. i have this map. please help me to find the problem. if you can point the area in this map that problem is from that.

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Well, my Ibanez TBX150R Tone Blaster Xtreme Guitar Combo Amp worked fine for the longest time, and suddenly after a show, every time I turned it on the "hot" channel it popped and banged every...


Sounds like a problem with the channel itself, if the clean channel works then its not the lead, input, guitar or the drivers. You have to be careful when opening up amps as some can hold a residual charge and there can be danger of electrocution.

I would recommend getting it looked at by a pro, it doesn't sound like an expensive fix.

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No sound


There can be any number of reasons for this problem - solve it diagnostically by starting with something that you know is working and work through systematically to the other end.
  1. Test a microphone on a separate amp to make sure it works okay. Check amp and speakers working. Check that all output cables from mixer to amp are working by testing separately.
  2. Plug microphone into a channel on mixer. Also plug in headphones and turn headphone volume control up.
  3. Make sure input sensitivity knob is turned up a bit (say half way) and main output faders (yellow) are up.
  4. Check that channel is turned on (little button just above the channel fader- needs to be pressed down)
  5. press pfl (pre-fade listen) button (next to button to switch channel on)- do you get any sound on main output or headphones or any indicator lights on mixer to show signal is getting that far (eitehr the individual channel metering lights or the main ones in the central section)?
  6. turn off pfl - make sure channel fader (slider) is up - normal position is ) - about 3/4 of way up. Check lights again on individual channel and main output section - any signs?
  7. Is the sub mix button for the channel pressed down - in which case you will need to bring sub mix (red) output faders up as well as main faders.
  8. If you have got signs of signal on the individual channel but not main see if the channel has been routed somewhere odd (like a subgroup of channels).
  9. Plug a working amp and speakers into one of the auxiliary outputs and use the relevant auxiliary send knob (on each channel just above the faders and pfl switches) to pan some signal to that auxiliary out - do you get anything? There is also a headphone socket for listening to the auxiliary channels (with a selector switch /knob to determine which one - make sure it is in the right position) try listening to the auxiliary output with headphones - anything? If yes the problem lies in the main output section.
  10. Check that there is not a jack plug in the insert socket (to route signal through an external effects unit) without a matching return jack being plugged in - if appropriate is relevant effects unit switched on and correctly set up - if unsure remove the insert plug to take it out of the system.
  11. Make sure any mute buttons are not switched in on main outputs.
You can download a full user manual here http://www.allen-heath.com/gl/gl2400

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1 Answer

I have Mackie mixer cfx12 all the channels work except for channels 2 & 3, I turn the pre amp trim pot all the way up but no input is present, I also tried solo PFL for these two channels and no...


I suspect one of the upfront IC amps has been damaged. This can happen if people power the mixer from a receptacle that is different from where other connected equipment is powered such as amp. For example, mixer is at one end of the hall and other inouts such as an output of a guitar amp is plugged in. If a ground fault or spike occurs, teh ground bounce can exceed the common mode voltage of the input amps.

In your case, the inpout amps are discrete transistor types.

A voltage surge into the inputs of your unit would LIKELY pop two bypass caps that are 330pf. For channel 2 these are C205 and C206. Check those for shorts.

VERIFY audio is available at the "send" (tip) of the channel insert connector... this verifies the preamp stage. You can PROBABLY plug a set of headphones in to check this... ONLY one side will have sound of course. Verify this is a good test by checking a working channel. The level will be quite low and we are looking for just some signal.

IF you do have signal on the channel insert send which is the "tip" of the channel insert with the trim turned up, let me know and I will check the schematic for the next thing to check farther down the line.

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I have a Peavey FX 16, im trying to hook up a monitor so my guitar player can only hear himself. Im running 2 amps for monitors, 3 of us work off of 1 amp for our monitors and we run him one his own amp....


Quick and dirty way is to turn up one of the AUX channels, say #1 on the Guitar player's inoput channel/strip. Have all other AUX #1 completely CCW so none of the others get mixed on the AUX.

Use a TRS cable from AUX1 output to the guitar players monitor amp.

NOTE. The signal to his amp will only be controlled by the AUX1 on his channel AND the AUX1 Master.

One normally uses the AUX outputs for monitor functions.

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Sliders do wear out.

Try shorting channel 1 input and see if that affects the noise. A hissing noise is probably a bad preamp chip. That is shop work at a repair facility.

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Replace the switch. You gave no make/model number for your amp but if it has a jack for foot pedal operation of clean/dist function then try that. (on most amps) it will switch in spite of a bad front panel switch.

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