Roberts R303

R

Ron

Guest
This is probably one for Arfa.

An old friend asked me to take a look at his Roberts Radio R303, I`d
usually say no, but, well you know how it is!.
It's not oscillating, I imagine it's the old AF114 promble, shouldn't be
too much trouble to mend, but how the hell does one get the chassis out
of the case?
The only way seems to be to take out the battery cradle and speaker,
which looks difficult with the circuit board in the way, or am I missing
something?

Ron
 
Ron <ron@lunevalleyaudio.com> wrote in message
news:s8SdnUDJgtlLBOvWnZ2dnUVZ8oKdnZ2d@bt.com...
This is probably one for Arfa.

An old friend asked me to take a look at his Roberts Radio R303, I`d
usually say no, but, well you know how it is!.
It's not oscillating, I imagine it's the old AF114 promble, shouldn't be
too much trouble to mend, but how the hell does one get the chassis out
of the case?
The only way seems to be to take out the battery cradle and speaker,
which looks difficult with the circuit board in the way, or am I missing
something?

Ron
Perhaps one of the first solid state repair "fixes". If a 4 pin can, cut the
Click to expand...
pin connected to the can. Nothing to loose , can always resolder if
something else. Never did find the reason fo rthe internal short,
metalisation creep?



--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://diverse.4mg.com/index.htm
 
"Ron" <ron@lunevalleyaudio.com> wrote in message
news:s8SdnUDJgtlLBOvWnZ2dnUVZ8oKdnZ2d@bt.com...
This is probably one for Arfa.

An old friend asked me to take a look at his Roberts Radio R303, I`d
usually say no, but, well you know how it is!.
It's not oscillating, I imagine it's the old AF114 promble, shouldn't be
too much trouble to mend, but how the hell does one get the chassis out of
the case?
The only way seems to be to take out the battery cradle and speaker, which
looks difficult with the circuit board in the way, or am I missing
something?

Ron
Click to expand...
Hi Ron

What Mr Cook says below on the problem and its 'fix'. I actually used to
'blast' the internal short off the transistor, by momentarily shorting the
transistor base to collector :) ...

On getting the chassis out, is it by any chance one of the ones where the
top part is secured into the case by screws at either side, which are also
the handle pivots ? If so, the handle clips off on spring-loaded 'keyholes'
and then the pivot pins revealed have a screwdriver slot in them. Once
removed. the radio withdraws from the top. Could be thinking of an entirely
different model of course. Old grey matter is not what it once was ...

Arfa
 
On 13/02/2010 13:24, Arfa Daily wrote:
"Ron"<ron@lunevalleyaudio.com> wrote in message
news:s8SdnUDJgtlLBOvWnZ2dnUVZ8oKdnZ2d@bt.com...
This is probably one for Arfa.

An old friend asked me to take a look at his Roberts Radio R303, I`d
usually say no, but, well you know how it is!.
It's not oscillating, I imagine it's the old AF114 promble, shouldn't be
too much trouble to mend, but how the hell does one get the chassis out of
the case?
The only way seems to be to take out the battery cradle and speaker, which
looks difficult with the circuit board in the way, or am I missing
something?

Ron

Hi Ron

What Mr Cook says below on the problem and its 'fix'. I actually used to
'blast' the internal short off the transistor, by momentarily shorting the
transistor base to collector :) ...

On getting the chassis out, is it by any chance one of the ones where the
top part is secured into the case by screws at either side, which are also
the handle pivots ? If so, the handle clips off on spring-loaded 'keyholes'
and then the pivot pins revealed have a screwdriver slot in them. Once
removed. the radio withdraws from the top. Could be thinking of an entirely
different model of course. Old grey matter is not what it once was ...
Click to expand...
Thanks arfa, I`m aware of the AF114 internal shorts, even way back in
the late 60`s it was happening, sometimes flicking them with a finger
nail would get them fired up again, temporarily at least. I used to snip
the screen wire.

The top of this radio seems to be glued to the case, the handle is
fastened on with spire clips directly to the wood, the chassis is held
in by two thin plywood strips in grooves, removing these allows the
chassis to slide backwards (downwards) but obviously the speaker is in
the way, the lower nuts holding the speaker in are somewhat inaccessible
with the chassis in the way.

Ron
 
Ron <ron@lunevalleyaudio.com> wrote in message
news:3J-dnWHVqtCdLevWnZ2dnUVZ8vudnZ2d@bt.com...
On 13/02/2010 13:24, Arfa Daily wrote:
"Ron"<ron@lunevalleyaudio.com> wrote in message
news:s8SdnUDJgtlLBOvWnZ2dnUVZ8oKdnZ2d@bt.com...
This is probably one for Arfa.

An old friend asked me to take a look at his Roberts Radio R303, I`d
usually say no, but, well you know how it is!.
It's not oscillating, I imagine it's the old AF114 promble, shouldn't
be
too much trouble to mend, but how the hell does one get the chassis out
of
the case?
The only way seems to be to take out the battery cradle and speaker,
which
looks difficult with the circuit board in the way, or am I missing
something?

Ron

Hi Ron

What Mr Cook says below on the problem and its 'fix'. I actually used to
'blast' the internal short off the transistor, by momentarily shorting
the
transistor base to collector :) ...

On getting the chassis out, is it by any chance one of the ones where
the
top part is secured into the case by screws at either side, which are
also
the handle pivots ? If so, the handle clips off on spring-loaded
'keyholes'
and then the pivot pins revealed have a screwdriver slot in them. Once
removed. the radio withdraws from the top. Could be thinking of an
entirely
different model of course. Old grey matter is not what it once was ...


Thanks arfa, I`m aware of the AF114 internal shorts, even way back in
the late 60`s it was happening, sometimes flicking them with a finger
nail would get them fired up again, temporarily at least. I used to snip
the screen wire.

The top of this radio seems to be glued to the case, the handle is
fastened on with spire clips directly to the wood, the chassis is held
in by two thin plywood strips in grooves, removing these allows the
chassis to slide backwards (downwards) but obviously the speaker is in
the way, the lower nuts holding the speaker in are somewhat inaccessible
with the chassis in the way.

Ron
Click to expand...
from 67 Newnes
loosen battery bracket
remove speaker
remove woodscrews on chassis sides
slide chasis out
 
On 13/02/2010 14:55, N_Cook wrote:
Ron<ron@lunevalleyaudio.com> wrote in message
news:3J-dnWHVqtCdLevWnZ2dnUVZ8vudnZ2d@bt.com...
On 13/02/2010 13:24, Arfa Daily wrote:
"Ron"<ron@lunevalleyaudio.com> wrote in message
news:s8SdnUDJgtlLBOvWnZ2dnUVZ8oKdnZ2d@bt.com...
This is probably one for Arfa.

An old friend asked me to take a look at his Roberts Radio R303, I`d
usually say no, but, well you know how it is!.
It's not oscillating, I imagine it's the old AF114 promble, shouldn't
be
too much trouble to mend, but how the hell does one get the chassis out
of
the case?
The only way seems to be to take out the battery cradle and speaker,
which
looks difficult with the circuit board in the way, or am I missing
something?

Ron

Hi Ron

What Mr Cook says below on the problem and its 'fix'. I actually used to
'blast' the internal short off the transistor, by momentarily shorting
the
transistor base to collector :) ...

On getting the chassis out, is it by any chance one of the ones where
the
top part is secured into the case by screws at either side, which are
also
the handle pivots ? If so, the handle clips off on spring-loaded
'keyholes'
and then the pivot pins revealed have a screwdriver slot in them. Once
removed. the radio withdraws from the top. Could be thinking of an
entirely
different model of course. Old grey matter is not what it once was ...


Thanks arfa, I`m aware of the AF114 internal shorts, even way back in
the late 60`s it was happening, sometimes flicking them with a finger
nail would get them fired up again, temporarily at least. I used to snip
the screen wire.

The top of this radio seems to be glued to the case, the handle is
fastened on with spire clips directly to the wood, the chassis is held
in by two thin plywood strips in grooves, removing these allows the
chassis to slide backwards (downwards) but obviously the speaker is in
the way, the lower nuts holding the speaker in are somewhat inaccessible
with the chassis in the way.

Ron


from 67 Newnes
loosen battery bracket
remove speaker
remove woodscrews on chassis sides
slide chasis out


Aye thanks for that, Having a feel around with a finger (ooer missis) I
Click to expand...
realised that the speaker only has two nuts at the outer edge, so it
shouldn't be a bad job

Ron
 
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