Question about Jamo MPA201 2-Channel Amplifier

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Two Jamo MPA-101 amps not working

I picked up a couple of Jamo MPA-101 amps the other day. The Blue power light comes on with both of them but no output. I have removed the covers and checked the only fuse I can find. The fuses on both amps are good. What should I do next? Thanks. Lee Jacobsen 804-462-3246

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  • NHTC40D Jan 20, 2009

    I have the same problem. It appears as though it is on, but not sending any power to the speakers. The fuse does not appear to be blown.

  • Anonymous Apr 13, 2009

    same problem, i have two of them and when i switch to the other one the speakers work.

  • Scott Frye
    Scott Frye May 11, 2010

    HI....
    Do you have good speakers connected when you turn them on?
    Are the amps in bridged or stereo mode?

    Here's their link

    http://www.jamo.com/Default.aspx?ID=1424...


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I can almost guarantee that you'll find bad electrolytic caps on the power supply board to be the cause of the problem. I've seen several of these with the same problem. The protect circuit stays latched due to excessive ripple.

Posted on Aug 14, 2009

  • John McCutcheon Apr 20, 2012

    So how do I get it fixed?

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I replaced all of the caps in the power supply section and it fixed this amp.
I own Spectrum Electronics , 727-289-9746, I work on all makes and models.

Posted on Jun 06, 2012

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I'm probably too late. Check to see if your amp is in "Auto" mode, this is automatic turn-on when it sees input.

Posted on Oct 07, 2009

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1 Answer

How to hook speakers up to a realistic mpa-40


The MPA-40 is a mono public address amp. So it has one speaker output. You select the appropriate socket to suite the speaker type. The 4/8/16 Ohm outs are for various tpyes of Hi-Fi speaker. The 70 Volt is used for muzak in shopping centres, restaurants, and waiting rooms.


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If you have a pair of 8 ohm Hi-Fi speakers, you can diasy chain the connections and then use the Com and the 16 Ohm connection.

Daisy chain means you take the wires from a pair of speakers. Connect together the wires going to red on one speaker and black on the other. This now leaves you with two wires going to the other red and black terminals on the speakers, but the ends in your hand are not connected to anything yet. Plug the black in to COM. Plug the red in to 16 Ohm.

The sound from the speakers won't be stereo. It will be mono because that's all the amp outputs. But both speakers will work so long as they're functioning units.

If you have two 4 Ohm home theater speakers then you can do the same trick. 4 + 4 makes an 8 Ohm load. Connect the red to the 8 Ohm output.

Don't be tempted to try to connect to multiple terminals. The amp isn't powerful enough to to run more that one speaker chain.

Hope this helps

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1 Answer

Power led on but no output


Try to trace the fault systematically from one end of the system to another, starting with something that you know is working
  1. Start by checking your sound source (cd player or whatever) is working by connecting it to another amplifier or computer.
  2. Check the connecting cable is working from the sound source to the amp and is not shorted out.
  3. Make sure your loud speakers actually work (briefly shorting a 1.5 volt AAA battery across the speaker terminals should produce a crackling sound without doing any damage)
  4. Check loudspeaker cables are properly connected to output connectors and are making a good contact.
  5. Try connecting something like your computer speakers (or use the microphone in jack on the computer itself) to the line output socket of the Jamo. If you can get some sound this way it would suggest that the internal output overload protection fuse may have blown. You will need to open the case to access this. NOTE if your JAMO is still in warranty take to authorised repairer otherwise you may invalidate your warranty.

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1 Answer

I'm replacing a JAMO amp.


The 201 is 100w in to 4ohms and the 101 is 50w into 4 ohms other then that there the same

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1 Answer

I have a MPA 201 2 channel amplifier that just stopped putting out power, power light is still on, any suggestions?


You need to determine if the power is getting to the audio amp section. For instance with the volume full up is it humming etc?
As a 'rule' it's unlikely that both left and right channels will fail at the same time (unless you have done something silly with the amp) you are looking for something that is common to both channels. Which is why the power section is first suspect. The exception to the rule (above) is where amps use say an IC power amp for both channels. You will find this IC on the big heat sink. Check whatever is on that anyway for damage or burning.
The only other area could be the pre-amp part. Again this could be a single IC controling both channels, so it's failure could cause a loss of sound. By the way if you can hear music/sound coming through when you put it up to full volume the pre-amp will be generaly good.

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1 Answer

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Check the small electrolytics on the power supply board for high ESR, Very common problem on these amps. Protect circuit stays latched due to high ripple from PS.

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1 Answer

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Might be a failing semiconductor component (usually an old transistor) in the amplifier's front end. This caused by the oxidation through the component legs or pin. I usually touch and move each transistor's body to exaggerate the noise. You can research also what kind of noise is it producing- intermittent, static, etc.
hope this helps..

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Where was the smell coming from? The amp or the sub?

Do you have an ohmmeter to check to see if the sub's voice coils are still intact? Can you try driving the subs with another source to verify they are ok? We need to eliminate the variables here.

If the subs are okay then it's obvious that the problem is in the amp. I'm not sure if there are any protection devices internal to the amp, but I am sure if you remove the cover from the amp and if it was amp that was producing the burnt smell, you'll have no trouble visually identifying where the problem is in the amp. Most likely you'll find a part that is discolored or black & burned.

Usually a smell like this from a solid state device indicates a component has been overheated and if run long enough in this condition will fail.

- Jim


- Jim

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1 Answer

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As It was mentioned on the premium post, if after removing the fuse(s) from it, the amp powers up and stays ON; the failure is on the transistors or mosfets and they will need to be replace to get the amp working again on channel 4.
I would suggest to contact the manufacturers to get an authorized repair center to fix it under warranty if your amp is less then a year old.
Good Luck.

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