[sdiy] Oberheim Matrix6r Problem

[Roy J. Tellason]

On Wednesday 03 August 2005 09:18 pm, Carbon111 wrote:
> Hi Folks,
> Anybody ever come across one with an entirely dead right channel. Its
> not the output jack, the headphone jack shows the same behavior. Checked
> the "stereo" setting in the Master section - all is well. The "upper"
> channel in every split is silent also - I'm assuming this is the same
> problem. Any suggestions on where to start to look.

I'd look real close at the solder connections at that headphone jack...

It seems that a lot of manufacturers have underestimated the amount of force 
that would tend to be normally applied to board-mounted connectors in terms 
of the amount of solder they leave unmasked when they make the board.  Yamaha 
portasound stuff was notorious for this with their DC input connector,  which 
when it broke the foil would normally not allow the unit to operate off 
batteries,  either.  My repairs to these usually consisted of scraping a lot 
of the solder mask off the board and adding a lot of solder,  in addition to 
bits of wire to bridge the broken foil connections.

That'd be the first thing I'd look at,  anyhow.