Re: Disassembly of the VR-500?

Thanks to the group members who responded on this disassembly 
question. In my my case I am certain that it is the internal speaker 
contacts and not the earphone switch/jack contacts that are 
intermittent. I have learned through past discussions that both 
problems are possible based on the vintage of the radio.  Desoldering 
of the shields and the use of a spanner tool to remove the control 
pots from the frame sounds doable. I might make use of the tape guide 
adjustment tools from my old VCR repair days (anybody remember VCRs?) 
Thanks again for all the help.  I will post back any interesting 
anecdotes.

Joe Z. (jzagar53)


--- In [email protected], "eckrot" <eckrot@...> wrote:
>
> Hello,
> 
> I did disassemble my VR-500 several times, for example I changed the
> WFM filter to 110kHz for WFM broadcast DX. So, if you are familiar
> with SMD soldering, it should be no problem in general to do it. You
> need to unsolder some shielding and the antenna connector, and also 
> to unscrew the knobs from the chassis (you need special tooling for
> that). The speaker is not connected by wires, there are kind of
> elastic metallic stripes pressing on solder pads on the last PCB - 
so
> you need to unmount all. 
> If you are not experienced in such things - don't try it!
> 
> Another question: does anybody own a a VR-500 service manual? I 
would
> like to try to improve the 0-30MHz input stage, I have some ideas 
how
> to do it but unfortunately I do not have a readable schematic. Could
> anybody help, please?
> 
> -Eckhard
> 
> --- In [email protected], "david273129" <david.clench@> wrote:
> >
> > --- In [email protected], "jzagar53" <jzagar53@> wrote:
> > >
> > > How tough is it to disassemble the VR-500 to get down to the 
speaker 
> > > level?  I need to fix the speaker contacts that apparently 
become 
> > > intermittent due to oxidation causing audio to cut in and out.  
Is 
> > > desoldering required to get the sub-boards out?
> > >
> > Hi, I would not even think about trying to take the radio apart. 
As 
> > the other member said just a little switch cleaner on the plug 
and 
> > work it in and out. You may have to do it a few times but it 
should do 
> > the trick.
> > 
> > Regards
> > 
> > Dave.
> >
>