[gareth magennis]

"Mike Rivers" wrote in message ...

On 7/31/2013 4:58 PM, Gareth Magennis wrote:

For some unfathomable reason, Yamaha elected to fit knobs on this mixer
series that were a smaller diameter than the holes punched in the top
panel.
Since all the pots are PCB mounted in groups of 6 channels, that means
that pressure or a blow to the top surface forces all the knobs through
the top panel, breaking the PCB's.

You can break anything if you try hard enough. I once repaired a
Soundcraft 200 mixer that had some intermittent channels. The problem
turned out to be that on a few modules, the put mounting lugs had
sheared. Each channel was on a module with the circuit board
perpendicular to the top panel. The pots were mounted to the board with
solder lugs and nuts through the top panel of the module, so the pots
couldn't go anywhere if the mixer took a hit on the knobs. But the only
thing holding the circuit board in place was the pot lugs (leads). I
suspect that what happened was that someone dropped the console on its
back, the case stopped when the back hit the deck, but the board tried
to keep moving and broke off a couple of the mounting leads in the
process. This wasn't a cheap mixer, but still, you're not supposed to
drop it.

Was this a design defect? Some would call it that, others would just say
it was a case of bad luck and extreme mishandling.





Yes, but the Yamaha can be destroyed simply by someone with a fat arse
sitting on it, the 200B would not even notice.
This sometimes happens in the back of a van.


Gareth.