Thanks to all who wrote in response to my request. I decided to try
rather simple, similar to what "abcd1234" recommended immediately
below. I just
dipped a cotton swab into isopropyl *** and gently rubbed it along
crack alongside the volume control wheel, letting some drip inside.
Then I just
rotated the wheel back and forth several times, which seemed to
static. No need to remove the back cover, thankfully.
> just use radio-shack tuner cleaner
> by putting a drop inside the control from the side
> of thet YB400 .
> If U insist removing the back cover, remove
> one more***from the battery compartment
> and then release the small plastic tabs
> that snap into place between the halves of the case at the bottom.
> You could do that by carefully inserting (1/4nch length) of a small
> screwdriver between the case halves near the bottom of the case.
> GOOD LUCK
> >The volume control wheel on my Grundig YB-400 is a little staticy, so
> >I wanted to remove the back of the chassis to get to the control (on
> >the side of radio), in order to apply isopropyl ***, but removing
> >the 3 screws on the back didn't seem to release it. Does anyone know
> >if this is possible, or desirable, or another way? BTW I was careful
> >to unplug the radio, and to remove the batteries, first.