Question about Mackie 1604 Vlz3 16 Channel Mixer

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No output on any channel led lights up - Mackie 1604 Vlz3 16 Channel Mixer

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  • Mackie Master
  • 5,603 Answers

Check power supply first. Look for cables that might have become disconnected.

I assume you know how to unmute the channels. You also need to select the channels to go to the L-R by depressing the switches at each channel..

Suggest you download the manual if you don't have one and refer to the signal flow diagram. You can do a lot of external testing and see what switches need to be set to pass signals.

SOME cables are TRS types for balanced signals, including the mains output.

Posted on Oct 06, 2009

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Clipping always lit


  1. Make sure nothing is plugged in.
  2. Turn the GAIN, LEVEL, and FX knobs for each channel, counter-clockwise all the way.
  3. Bring the MAIN fader all the way down.
If the signal LED's above the MAIN fader are still lit, then the board most likely has a short in it and will require repair.

If the signal LED's are dark, repeat the following on each channel...

  1. Rotate GAIN clockwise until the mark on the knob is at "12 oclock".
  2. Rotate LEVEL clockwise until the mark on the knob is at "3 oclock"
  3. Raise the MAIN fader to "0".
  4. Check LED's - if they light up then the channel you are working on is "noisy" or has a short in it.
  5. Return GAIN, LEVEL, and MAIN to "all off".
  6. Repeat with next channel.

Jan 25, 2014 | Behringer Xenyx 1202fx Mixer 12 Input 2...

1 Answer

I have a Behringer PMP 6000 powered mixer. Channels 4 & 5 yellow overload light is constantly lit. No sound from either channel (just a faint hum when volume slider approaches max level...


There are NO "yellow" overload LED's period. The clip or overload RED LED's are just above the PFL buttons for selecting a solo channel. There are "yellow" signal received lights (level set) up near the trim controls. In normal operation these will light when signal is received. Here is schematic for the PMP5000 which is really identical for the 6000.
http://elektrotanya.com/behringer_europower-p0569_hca2400_sps1000_dpx_pmp-1280s_5000_sch.pdf/download.html This has part of the DSP and PS and the PA circuits.
Scroll down to "get manual" and click on it to download. Ignore other download links on the page.
Try turning off the Phantom power if it might be on... If that stops the hum, something is the matter with the bypasses feeding Phantom power to those channels... Possible problem might be shorting of one of the coupling caps at the preamp input. The PMH5000 drawings are more accurate at the input circuits. You will note that the level set LED's are the yellows, and the clip/PFL LED's are the red ones. I suspect that RF bypass caps such as C110 or C121 (example typical for channel one) might be shorted. This makes noise on the Phantom power line unbalanced and will get into the channel where one of these caps is shorted. Do a test: Plug a shorting jack that shorts the tip to the sleeve intot he inssert for the channel. With the LOW CUT button up, observe is the level set LED for that channel dims or goes out. If it does, then I supect you have a shorted RF bypass cap at the input..The next test involves driving a KNOWN balanced signal into the XLR jack and using a TRS in tthe inout 1/4 inch, test the levels with an oscilloscope to verify the hot and the return have equal amplitudes. I they don't, congratualtions you have to tear the main board out... lots of knobs and screws to access the inout circuits and verifuy the cause... it could ALSO be a bad transistor in the inout pair, etc...

Sep 24, 2011 | Behringer PMP6000 VP1520 PA Package

1 Answer

Power light comes on but individual mute and channel lights are not working . No sound outputting.


This is likely a power supply failure within the unit. Needs to go to a shop for repair.

Sep 20, 2011 | Samson S Phone 4 Channel Headphone...

1 Answer

Hi , I wonder if you could shed some light on a problem my son has with his behringer pmh3000 amp. With the digital effects set to any number it constantly reverts to 1. Also when effects are turned on...


You say lights flash? There are a lot of LED's on the unit and there are displays. Depending on what you mean by "lights" sends us on a whole different path. Remeber the effects ADD to the noise as they add into the buss to the amps. You should have the Effect to MAIN knobs not too high... say 12 o'clock. Same for the effect send knobs for the channels. If all the LED's flash, better stop using the unit as there is a power supply problem and damage will occur.
Please read my tip on here about the hazard of Channel A output when using Speakon to 1/4 inch speaker cables or adapters. The SHELL or SLEEVE of channel A cable is the HOT one, NOT the tip so never let that shell touch or connect to ground. The effect window when first powered should display a zero, not one... If it displays 1 at first, unit needs to be taken for repair as there is a defect.

Connect ALL interconnected equipment to the same receptacle or power conditioner source. Pro's run extension cord back to mixer if they have other stuff on stage. The speaker cables should connect to NOTHING other than speakers... do NOT try to tap off the daisy chain outputs of speakers for anything other than speakers. Use balanced lines and isolating DI boxes to avoid ground loops. Make sure to only poower this from a grounded receptacle.

Apr 16, 2011 | Behringer Pmp3000 16 Channel Audio Mixer

1 Answer

My Yamaha MG102C has no sound, and all of the LED's are on. There's no inputs connected at all.


Correct me if I'm wrong, but if you have nothing connected as an input, you're NOT going to hear anything. I assume you can't get your inputs to get to main output fader(s), if that being the case, first make sure your gain knobs are up at about 12 o'clock position, your channel faders are up to 0 and then make sure "channel assignment buttons" are assigned to stereo outputs.

Mar 07, 2011 | Yamaha Mg102c Stereo Mixer

1 Answer

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

Feb 22, 2011 | Allen & Heath Allen and Heath GL2400-32...

1 Answer

I have a Mackie d8b, not getting any signal no matter what we try.


This is vague,,, there are so many outputs, knobs, LED's that I suspect you have not tried the right combination. I have no idea what your signal sources are... mics... tape... etc.

To start, turn the trim control of one channel that you have a signal source connected. Set all the EQ controls and the pan CONTROLS TO 12 O'CLOCK.

Check that you can trigger the clip light with high level of input. Press the solo button for that channel and using a set of headphones listen for any signal... turn the headphone level up and the slider for that channel...

First do your basic checks,,, try EACH mute button and see the LED light... try each solo button and see that each will light AND also that ANY solo light will cause the RUDE solo light to come on...

Dec 09, 2010 | Mackie 1604 Vlz3 16 Channel Mixer

1 Answer

The FX portion of the board is clipping with no input signal present, there is no sound output at all. Also, none of the mute/pfl LEDs light up on channels 1-12.


There are several clipping indicators on this board. Do you mean that the small vertical display to the left of the FX selection window is maxed out from top to bottom? I will assume that you have ALL the FX inout knobs CCW for all channels AND the FX slider all the way down. Also does the FX selection knob work to change the effect number? Does the rest of the board work? WILL the effects pass sound when you send it through the effects? You say no sound, but was that just to say with no sound sent to it it still is clipping, or that it will not pass sound?

Oct 18, 2010 | Behringer Pmp3000 16 Channel Audio Mixer

1 Answer

Fender HRD - clean channel works fine, drive & more drive VERY low volume, like a headphone across the room w/ all 3 volumes at 10. LED works fine in drive/more drive. All same w/ footswitch,...


Wayne, There's a time to take the amp to a pro shop andf get it done right. It' saves time and headaches, and also keeps you from inadvertantly smoking other parts or yourself. Now is that time.

Apr 17, 2017 | Fender Hot Rod Deluxe Guitar Combo...

1 Answer

Hello, The leds on my Mackie 1202 VLZ3 light up and sometimes stay lit even when there is no input going into the channels and the channels volume is completely down. Any thoughts? Thanks, Wayne.....


There are LED's all over these and you don't say which are lit... If they are mute or solo LED check the switches for a solo button or mute that is set.

IF they are the output level LED's plug in a set of phones and crank the phone volume up to losten if there is feedback or oscillation that is causing this.

HUM PICKUP due to a ground loop could be causing this. Make sure that ANYTHING connected to the unit that is also powered receives pwer from the SAME receptacle. If you have devices that receive power from a different receptacle you MAY have a ground loop. Noise on power lines can DAMAGE the equipment due to excedding the common mode input and output capability of the unit.

Finally, a strong local radio transmitter MAY be interfering. Sometimes the interference can go backward into the output lines to trigger the indicators.

As a test, when event occurs again, start unplugging anything connected to the mixer and see if disconnecting anything stops the problem. If you can have the problem with ONLY the power connected, then check if you have inadvertently created a loop within the unit by your settings.

Please refer to the "signal flow" diagrams in your user manual to see the possible feedback paths you can cause a loop to form.

REMEMBER the oscillation MAY be occuring well above the frequency you can hear !!!!

If you have access to an oscilloscope that would see if there is an oscillation going on.

Apr 17, 2010 | Mackie 1202vlz3 12 Channel Mixer

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