Realistic MPA-20

[BRSHiFi]

Out of a trash bin I picked an old Realistic MPA-20 cheap PA unit. I am having trouble finding a schematic and/or service manual for this unit.

Does anyone have one or know where to look?

 

[JMFahey]

Here's something:
https://www.circuitlab.com/circuit/func75/mpa-20-realistic-audio-amp/

And it seems to use some chipamp, so track its datasheet, the Realistic should be real close to the typical example shown.

Anyway it's more probable that you have a pot/jack/switch/connector, so clean/check them all, for that you don't need a schematic.

There's a reasonable possibility you'll save it.

 

[Enzo]

Or contact Radio Shack - the company, not one of the stores - and ask if they can provide the schematic. Realistic is the radio Shack house brand name.