MPS-2500 Problem

[stevesteve703@live.com]

Will only run bridged, regardless of switch position. Right side speaker terminals make audible noise when you wiggle connection(seems like its there but no signal).

I was thinking it was a bad RCA? or the Bridge switch? I switched the RCA cables around and still same problem.

[Eric D]

Internally that amp has wires going to the speaker connectors. So if you wiggle one of them, it should not change the noise of anything. I wonder if by wiggling it you are moving something else which has problems.

The RCA wires inside the amp are pretty weak and break off. Especially from vibration like they often get in a car audio installation. There is a chance one is broken off and causing your issues with bridging the amp.

[stevesteve703@live.com]

When I say wiggle I kinda mean moving them on the speaker terminals a bit, Ive opened it and checked the RCA cables, they seem to be intact, also I checked the internal speaker leads and they "seem" fine

[valeks1]

Check ground on both speaker terminals.

[nico boom]

Check for loose connections where the speakerleads are connected to the board. While pulling-off the connectors of the speakerleads prior to working on the board, these might come [partial] loose from the soldering that holds them connected to the board. These cracks will only be visible with the yellow connectors pulled off, and the solderings closely inspected under a bright lamp. If in doubt, re-solder. This is a must-do with all MS-275's while recapping. If these are O.K I would remove the board and check for anything that does not belong there [wire-strands] or burned traces.....
Hope this helps.
Nico