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I have a realistic mpa 35a amplifier that does not power up, no light, no nothing. What could the problem be?

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Posted on Jan 02, 2017

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SOURCE: Realistic MPA-35 amp by Radio Shack

I have scanned the MPA-35 Manual to a PDF file. It is a high-quality scan and as a result it is 12 MB in size. If you would like the manual, send me an email (dave@dadero.com), and I will email you a temporary link on myspace.com from which you can download the manual. It is in both English and French.

Posted on Oct 02, 2009

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Grubhead
  • 5190 Answers

SOURCE: I have a MPA 201 2 channel amplifier that just

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.

Posted on Nov 24, 2009

  • 1 Answer

SOURCE: Looking for manual Realistic MPA-40 35W

I have a realistic mpa-40 35 -watt pa amplifier owner's manual
cat, no, 32-2032A
You can conyact me @ ltlerock@aol.com

Posted on Jan 26, 2010

dunnbiker
  • 8546 Answers

SOURCE: am looking for owner manual

http://support.radioshack.com/productinfo/ProductResults.asp?Name=PA_Amplifiers&ID=003009004

Posted on May 02, 2011

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hook up speaker common wire to com,then hook up the speaker wire to whatever ohm the pa speaker is,regular ones are 8 ohm,stay away from 70 v,plug in a record player or aux in the rca jacks you can use 12 volts or 120 volts
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Looking for manual Realistic MPA-40 35W


I have a realistic mpa-40 35 -watt pa amplifier owner's manual
cat, no, 32-2032A
You can conyact me @ ltlerock@aol.com

Jan 03, 2010 | Audio Players & Recorders

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Realistic MPA-35 amp by Radio Shack


It's not that this amp isn't like "newer amps" with + and - terminals, it's that this amp is made for public-address system use. This kind of amp is used in a store, for instance, to pump background music through speakers all over the place. The terminals you connect to are determined by total impedance of the speaker configuration used.

Most single speakers, or the two- or three-way cabinets for home stereo systems, are 8 ohms. If you're connecting a single speaker you use the "common" and "8 ohm" terminals on the rear panel. With multiple speakers, you need to figure out the total impedance and use the appropriate terminal. In series, impedances add. Two 8 ohm speakers in series would total 16 ohms, so you use the common and 16 ohm terminals. In parallel, the total impedance drops. Two 8 ohm speakers in parallel total only 4 ohms. You need to figure the total impedance of the speaker configuration and connect accordingly. Too great of a mismatch will damage the amp or speakers or both.

You might be able to find the manual for this amp on Radio Shack's website. Here's a link to the manual for the model MPA-40 which should have similar output terminals. The basic information about figuring out total impedance and general use of PA amps applies to your amp as well.

Jun 16, 2009 | Audio Players & Recorders

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Jamo MPA-101 2 channel amp quit working


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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Two Jamo MPA-101 amps not working


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.

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