Anonymouswrote:
Hi,
I'm a total electronics newbie, so forgive the ignorance! I have
just
gotten a device (a drum machine) with an apparently dirty DC input
power socket. Using a 9V AC-DC adapter, the unit works, but only
when
the connector is just in the RIGHT position. Otherwise the thing
doesn't turn on. How does on go about cleaning out one of these
jacks?
The jack is not loose or anything and fits the plug very tightly,
but
the slightest movement can cut the power. Any suggestions?


Also, while I'm here, can any damage be done by using a 300 mA
adapter
on equipment that requires only 50 mA? Again, total newbie here,
but
using this adapter on the drum machine hasn't hurt it (yet!).
Thanks
in advance.

I don`t think you have a dirty plugin jack. I beleave it may have some
bad solder connections where it is attached to the main powersupply
board or you may have a faulty 9 volt adaptor.