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MPA-101 Amplifier powers on, receives source signal, the fuse is not blown inside, but no sound comes out of the amplifier. The amp is pretty new, doesn't even have dust inside the unit.

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  • daroll19 Oct 14, 2008

    This is a Jamo amp that I am trying to use to power a passive subwoofer. It powers on, the LED in the front remains constant, as the manual states it should from it knowing it has a signal, but no power output in Stereo or Mono Modes. (The LED is NOT red, but Blue.) I was guessing some internal problem, but I am not technicial by any stretch. Thanks for the response. daroll19



    And literally, to state it again, the amp looks un-used in its appearance.

  • jacobsenlc Dec 16, 2008

    I have the same exact problem with TWO MPA-101 Amps.

    L Jacobsen

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Hello, is this a Radio Shack PA amp or Jamo amp? The unit is probably in "Protect" mode. Is this a PA system or a receiver...receivers have a protection circuit that will not let the speaker relay activate if the amplifier output section is shorted and sending voltage towards the speakers...so they won't fry!!The speaker relay should activate within 3 to 5 seconds if your output section is ok.

barneyluc

Posted on Oct 14, 2008

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1 Answer

No sound from subwofer


If it is a powered sub, a fuse may have blown inside or the amplifier may have failed

Sep 24, 2012 | Denon Avr 2307ci 7.1 Channel 945 Watt...

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Where on my mixer should I plug the subwoofer into? Or would plugging it in somewhere else be better ?


This will depend on whether your sub-woofer is powered (has it's own built in amplifier) or not. If it is not powered it will need connecting to an amplifier. If it is powered you will need a line level output either on the amp or the mixer.
Many modern amplifiers (and some mixers) have a dedicated output for sub-woofers in which case this is the best place for it because the higher frequencies will have been filtered out.
Some high quality amplifiers like the JAMO MPA 101 have a filter switch and adjustable filter level for powering sub-woofers. You then just connect the speaker to the speaker terminals in the normal way.

Otherwise on a p.a. mixer you could use the main output, one of the auxiliary, monitor or sub-mix outputs. If you are not using the main output you will need to route signal to the appropriate output accordingly. Either way your output signal will cover the full frequency range - your subwoofer may have built in filtering or you may need to use some sort of crossover to split the signal between the sub-woofer and the rest of your speaker system.

Feb 25, 2011 | Audio & Video Receivers

1 Answer

Set dead


Hi,you can use the following instructions below to troubleshoot the receiver set that is dead.

Instructions



Turn the receiver off and disconnect the power cable from the wall and the back of your receiver.

Test the cable with a multimeter to verify that it is working properly and supplying the receiver with full power. Multimeters are widely available through electronics supply shops, hardware stores and various online retailers. Different multimeters give different readings, so check your operations manual if you are unsure how to test a power cable for continuity. Replace the power cable with a working one of the same type if the original cable is not working properly.

Connect the multimeter to the pins where the power cable connects to the amplifier if the cable is working properly. This is the same area from which you disconnected the power cable in the first step. This is a particular process and all multimeters use different readings to test for pin-out continuity.

Check the fuses on the back of the amplifier if the multimeter shows a correct reading when you test the power cable and power connection on the back of your amplifier. Look carefully for a cracked filament within the glass tube; even a small crack can result in power failure or intermittent operation. A blown fuse will generally look gray or black around the edges or inside the glass tube. Blown fuses will not provide power to the amplifier and are a common cause of no power or a single dead channel, depending on the location and type of fuse.


Tips & Warnings

Opening the amplifier is not recommended, as there is a risk of electrical shock and you may void the manufacturer's warranty from Yamaha or any warranty provided by the retailer you purchased the amplifier from.

Always replace fuses with the same voltage fuse. Using the wrong type of fuse can damage your amplifier.

Do not try to open the receiver and fix the power supply if you believe that you have a power supply problem. This is generally quite dangerous if you do not know exactly what you are doing or are not working with the proper tools.

Hope it helped..

Feb 18, 2011 | Audio & Video Receivers

1 Answer

It turns on,everything works normal and sound even comes out of the headphone jack.but there is no signal coming out of the speaker jacks.no sound or test tone


Hi depending on the design some receivers , when you plug in headphones, speaker sound is disconnected by the headphone socket so it could be faulty, or there may be a separate switch to switch of the speakers, (while using headphones) if so that switch could be suspect. I dont think the amplifier part of the receiver is at fault as you say you can hear sound at the headphones. It is not impossible though that a fuse has blown inside the amp, If you unplug from mains and look inside you may spot a blown fuse , (only replace with one of the same rating).
Hope this helps
pete

Nov 14, 2010 | Teac AG-V8060 Receiver

1 Answer

Amp protection circuit has been activated


1-check your input cables from connected equipments(cd player or dvd p
layer or any other media source).
2-adjust your input signal level(from-10 db to 0 db).
3-amplifier power must be bigger than total power of all loudspeaker with 20%----(if total power of loudspeaker is 8 watt amplifier must be 10 watt.

Nov 28, 2009 | Onkyo TX-SR605 Receiver

1 Answer

Power will not stay on


Activated protection circuitry means that the amplifier is seeing conditions it does not like and is shutting down the power to prevent further damage.
Either you have a short in your speaker wires, in your speakers, or a blown amplifier.
Disconnect both speakers and turn on the amplifier. Does it still give the error message? If it does, your amp is blown. If it does not, carefully inspect your speaker wires and their connection. Make sure all looks good and reconnect the speakers and try it again. Still get the error message? You likely have a problem in your speaker cabinet(s).

Apr 21, 2009 | Onkyo HTR500 Receiver

1 Answer

Right light comes on- but then shuts off trying to get to turn on


First, check your fuse, it really could be that simple. Check it with the Ohms setting on your DMM, do not bother with continuity. If it is under 1 the fuse is fine.

It actually sounds like a short in the amp circuit. Inspect the amplifier where it connects to the heat sink. Check for signs of oxidation or any contaminant that may cause a short in the amplifier. Ensure there is ample thermal grease between the amplifier and the heat sink. You may wish to reflow the 22 pin connection on the board. I would recommend desoldering the whole component if you can, cleaning and testing it, and resoldering to the board with fresh lead free solder and no clean flux.

If the amp is blown you can replace it for around $70 USD.

Apr 02, 2009 | Pioneer VSX-D510 Receiver

1 Answer

Hi, I Have a Warfedale pro BX1780sd unit, last night during a performance the mains fuse (8Amp) on the back of the pannel blown. I looked in saide today and found that both the 15 Amp fuses inside the...


check shorted rectifier diode in main power supply,check shorted power transistors,if it is power IC amplifier unsold it put fuse if doesn't blown up the problem is solve.

Sep 07, 2008 | Audio & Video Receivers

1 Answer

Amp. doesn't turn on


22nf 630dc/300ac capacitor inside back left board, i found mine on top of this board, a magnifine glass will help to check the writing on capacitor, replaced mine, works as new, g.knight. uk. ( rs components.)

Aug 26, 2008 | Yamaha RX-V450 Receiver

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