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#186057 - 06/25/07 08:37 AM
Re: More PSR3000 problems
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Senior Member
Registered: 03/02/02
Posts: 1221
Loc: Preston, Lancashire, England
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Sorry about the delay!
The low voltage wire is the one going off to the keyboard. On my PA300 the high-voltage cable is detachable and comes in via a 2 pin connector. If you are looking at the label on the power supply with the bold font YAMAHA at the top, then the high-tension volts come in at the top and the low tension wire goes out at the bottom.
The screw that you need to remove is somewhere beneath the "MA" in yaMAha, you can just feel the indentation that marks the hole. Use a skinny cross-head screwdriver to remove the screw, or if you are unlucky it will be a torx "hexagonal star" screw instead. Having removed the screw, to open the housing you have to SLIDE the two halves apart lengthways (I cant remember which bit slides which way but there are hooks on one part at the low-tension end and if you try to prise the two halves apart you could break the hooks so take some care here). The grommet is also responsible for a little resistance as well, just to make things slightly awkward.
The low tension wire is soldered to the circuit board, the wire is coded with a white stripe so make a note (or take a picture?) before unsoldering. I think the wire pulls through the grommet so you can drag some fresh wire through, reterminate and do a neat job.
I just hope this is your problem, if you smell burnt plastic when you open the casing then you may have something more serious which I have not encountered (yet).
_________________________
John Allcock
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