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I have a Samick Amp Mixer Combo. The amp input works but the 4 channels do not work.The red indicator light does not come on either. I have ccecked the fuse is good, the speakers are working ans so is the Amp input. Cant figure out which the others channel iputs do not work.

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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stratcat50
  • 3 Answers

SOURCE: Crown D-150 Amp

Sounds like something was spilled into the amp and it got into the controls, switch and switch knob. As for the knob, lean the amp forward about 45 degrees and dribble hot water into the space behind the knob slowly. Try to keep the water from going inside the amp. Eventually, the knob should come off with some pulling & twisting. Once you get it off, replace both pots and the switch. If water gets into the amp just dry it up with paper towels, etc. and let it continue to dry while getting the new parts. HTH, Emory

Posted on Oct 05, 2007

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petraman7
  • 1175 Answers

SOURCE: Gem Sound XP-350 both channels failed

Speaker fuses are generally fast-blow styles 250 volt glass
If an amp shuts down, with speakers connected, it sounds like one of the power supply lines does NOT like what it's "seeing" . Probably output transistors bad ( or module)

Take it to a tech.

Scott out.

Posted on Jan 08, 2008

robotek
  • 1512 Answers

SOURCE: Problem with Samick PM4150 Mixer

Hi Mike, the protection circuit is operating in the amp. Generally, if you can turn the amp without speakers connected and signal up, then the amp is ok (as determined by the protection feature). If it goes into protection mode, without speakers connected, then you can be sure that the amp has a problem. I know its probably not what you wanted to hear, you may need to get the rig to a repair guy for a better check out of the problem. It would also pay to check your loudspeakers and leads to be sure that a faulty speaker or short circuit has not caused the amp to fail also. Reconnecting a good amp to a faulty shorted load, will make it fail again.... and the cycle continues... at more cost!! Good Luck, and questions you got, feel free to ask away. If you think the advice I have given here is good, a "FixYa" rating would be great:)

regards
Graeme

Posted on Mar 16, 2008

robotek
  • 1512 Answers

SOURCE: Gem Sound xp-350 power amplifier.

Hi again, how did you go?

regards
robotek

Posted on Sep 06, 2008

Grubhead
  • 5151 Answers

SOURCE: Bryston 4b amp, left channel blows the back panel

I would check out whatever drives the left channel first. If it is a transistor, you can put a ohm meter on the terminals and see if it shows a short (amp turned off). If there are two transistors for the left channel, and you find a short on one only, replace the other to be on the safe side.

Posted on Mar 25, 2009

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How to connect a samson s mix 5 channel mixer


It depends on what you are trying to connect. The XLR would be a professional type microphone, it does not have phantom so a condenser mic will not work. The other inputs should match your stereo equipment. The output goes to your amp.
The Samson S-Mix is a miniature, rugged 5-channel audio mixer with 4-line inputs and a single XLR microphone input. The line inputs are comprised of two 1/4" phone and stereo RCA phono connections. Each input channel has a rotary volume control and the outputs include stereo RCA phono connectors and 1/4" TRS phone headphone output. The S-Mix is powered with an 18 volt AC adapter.

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on the mixxer, use the "mix" "L" and "R" outputs. use 1/4 inch instrument cables, and connect the mox L and R to the amp's "channel 1" and "channel 2 inputs". always turn the mixing board on first, and the amp second- when turning off turn off the amp first, and turn off the mixer second. start with the mixer levels at the lowest, with the amp levels about 1/2 to 3/4 up. slowly raise the mixer channels first and then the mixer main volume until you have an adequate volume.

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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

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1 Answer

How do you use the mixer with a regular combo amp and stereo mic cable?


This is not hard to do, but it will require some adapters. Hosa company makes adapters to accomplish this. For example, if your Stereo mic has "1/4 inch male phone plugs" Hosa makes and adapter that has 1/4 inch female plug to Male XLR connectors. The Mackie, and just about every mixer in the world these days has Female XLR connectors for it's microphone inputs. So that will handle tha.

I'm not sure what you mean by the "combo" amp. If it has XLR inputs you can use Tip Ring Sleve male output jacks to the output. If your amp as conventional 1/4 inch female input jacks. Than a simple
1/4 inch Male to Male Guitar Cable will work fine. DON'T USE A SPEAKER CABLE as it is uninsulated and you will get 60Hz hum.
I hope this helps,
That looks like a great quality mixer you have!
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markfreedman_4.jpg

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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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The first thing to do is to swap teh L & R INPUTS to the amplifier. Did the speaker that works change?
If som the problem is with the setting of the mixer deck. If it did not change, then the problem is with your speaker wiring of the dead speaker, the speaker itself, or that side of the amp.
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