Sky wrote:
"b" wrote in message
...
On 14 mayo, 18:26, "Sky" wrote:
Sussed it. R12 had gone open, I replaced it and the radio sounds great.
Thanks for everyone's advice. I've learned a lot fault finding this
problem,
and I didn't have to spend a penny! So all round I'm pretty happy.

Gonna change all the dodgy caps etc now.
good news; I hope you checked the current across it- this may indicate
WHY it was open!
-B

My problem is that I'm not quite sure how to work out exactly what current I
should expect. I can work it out for simple circuits using ohms law but for
more complicated ones I'm not sure where to start.
The service sheet I have has a lot of good info but it doesn't show what
voltages or waveforms to expect at any points.

I guess this is something I need to work on. I'm hoping that the resistor
died because of age and degradation from temperature change..




Just feel it after it's been on for a while, if it's very hot, it
probably has too much current.