Yamaha PSR-12, has maybe 72 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
one chooses percussion accompaniment locks on. That and the power led
are the only things functional.
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 figure the problem
has to do with either gravity or heat buildup.
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. Know of a more productive
forum for the query?
"Well, there's two trains runnin'.
Ain't neither one goin' my way.
One run at midnight,
the other run just before day."
- from "Still A Fool", Muddy Waters, maybe 1949