Re: Electronic keyboard repair (I hope)
- From: "Mike Rieves" <mriev@xxxxxxxxxxx>
- Date: Wed, 12 Dec 2007 17:52:44 -0600
"Puddin' Man" <puddingDOTman@xxxxxxxxx> wrote in message
news:6jb0m35jnkfnkb7ui53l5mbi2glt4hd6ea@xxxxxxxxxx
New here ... somebody recommended a post here ...
Yamaha PSR-12, has maybe 60 keys, around 24 voicings, flexible-speed
percussion, canned tunes, etc. About 20 years old.
I turn it on lately, it works fine for 2-10 min., then freezes.
The little light that is supposed to come on for beat 1 (when
percussion accompaniment is running) locks on. Everything else
is Dead, Kaput, Pues Muerta.
The case has 2 halves. I workbench the thing turning the business
end (with keys and most PCB's) up 90 degrees to tinker, and it plays OK
for up to 3 hours (presumably lots longer). I figured the problem
has to do with either gravity or heat buildup, but I just left it
normally assembled and on for several hours and it didn't freeze up,
so maybe heat isn't the problem.
There are PCB's for power and switching, and 2 big PCB's presumably
for tone generation, special effects, etc. I tried some ribbon
cable connections: wouldn't budge. I'm afraid of breaking a
board or connector or ?.
It's gotta be repairable. I think. :-)
Any/all help/advice much appreciated.
Thx,
Puddin'
Get a can of parts freeze, if such is still available and start spraying
small areas of the circuit boards until the it either freezes or starts
working, depending on whether it's a bad solder joint or thermal problem.
that's the easiest way I know to find problems like that. If you can't find
parts freeze, get a can of air duster and spray it upside down, that lets
the propellent spray out and cool the area you're spraying. Remember to use
it in a well ventilated area.
.
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