ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
I have been a viewer of the forum for a long time, but I recently had an experience which I have not seen mentioned on the board, so I would like to share it.
I did a recap of the amplifier board on a Beomaster 5000 (from the mid eighties). Unfortunately I placed all the caps with the wrong polarity, so when I turned the receiver on, all I got was a little bit of smoke. I was not able to see where the smoke came from. All components looked ok.
I turned all the caps around, so they had the right polarity, but still it didn’t work. I could measure around -11V DC on both loudspeaker terminals (left and right). The no-load current was OK measuring 11 mV across the resistors.
The problem turned out to be the 2 resistors R215 and R115 which were open circuit when measured. Even if they looked OK on the outside. After replacing those it all worked again.
I have a feeling that these resistors are meant to work as some kind of fuses. So it might be worth checking those, if you have a dead amplifier in your Beomaster 5000.
/Jesper