I have encountered a strange anomaly in a casio sk-5 i just
finished.When i was working on it, i put a soldering iron to a pin
while it was turned on and it started playing an am talk radio
station. I took itoff before the solder melted, let it cool and tried
again and it did it again! The point i was soldering was one of the
body contact points i had planned and i decided to just go ahead with
that. One of the wires didnt stick well, and when tinkering it came
off. I decided to replace it, and when re-soldering it, i broke a
copper trace and had to replace it with hookup wire wire. However,it
wouldnt solder to the resistor at the next point on the trace(R20). I
took it off to solder to it but the legs were just too short and it
wouldnt work.
I couldnt find a schematic on the internet (they all linked to
JMEzine, which wasnt working), so I decided to just replace it with
wire as, connected to the pin, well and test the effct. The circuit
turned on and played, and the contact worked fine, so I finished the
project with the intention of fixing it later. Then, upon completion,
I was fiddling and trying the contact points and the radio station
came back in again, just as clear as before!
I will try to get the frequency next time. For now though, i've
posted pictures of the points in the body / alligator clip contact
group i built. The 8 pins in the box to the left attached to small
bolts which can be connected to each other with alligator clips. The
three bolts in the box on the right are attached to larger bolts used
to body contact tothe smaller bolts. The radio station can come from
all three. The pink wire is the resistor that has been replaced and
the wire jumper goes from the top point on that to the pin just to the
left of it.
I guess my question is: how in the hell might this happen?!
-Greg