🚀 go-pugleaf

The Beomaster 2400 can be serviced by a careful hobbyist, but if you're 
a neophyte, it's going to be a challenge, because everything fits 
together "just so".

That said, I'd get ahold of a service manual before proceeding. Stare at 
the schamatics until they begin to make a bit of sense. One area I'd 
look at would be a low-voltage supply used in switching audio sources: 
The B&O injects a few volts of DC into the signal lines, causing signal 
to flow (or not) through IN914 switching diodes. Kind of clever, but 
that small power supply does fail from time to time, and when it does, 
hum and/or unresponsive touch controls are the result.

I've also heard from other B&O restorers who claim that the original 
electrolytic capacitors are failure prone and must be changed. There are 
  lot of electrolytics in the thing! I plan on eventually doing just 
this to my own 2400, but after all the work, I don't think I'd ever be 
able to break even in resale.

A pretty nice-sounding receiver overall; the FM tuner is best with 
strong, clean signals.

Paul wrote
> Hi All,
> 
> I recently purchased a Beomaster 2400-2. The guy I purchased it of
> assured me it was working fine, but when I got it home it was a
> different story....
> 
> There seems to be a loud humming noise in the background, this seems
> to be present on all the inputs as well as the radio. I plugged in a
> set of headphones (thinking it might be the speaker outputs), but the
> hum was still there.
> 
> The other problem is with the radio...FM5 seems to work fine (despite
> the hum) but all the other FM presets have no sound FM1 to FM4 (when I
> turn up the volume to the maximum, I can hear them faintly)
> 
> I am just wondering if anyone has had any experience with these
> systems?, and could describe what the problem may be.
> 
> I haven't had much technical experience, but I am adventurous with a
> screwdriver and soldering iron.
> 
> If anyone has any schematics or any instructions on how to dismantle
> it, that would also be great.
> 
> Given the problems, it is still a cool looking amp. I was gutted when
> I discovered that it didn't work as I had been after one for quite a
> while....
> 
> Any help appreciated,
> 
> Cheers,
> Paul
> 
> Sydney, Australia