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
Hi,
Bought a beautiful BM900 in almost perfect working order except for a cracked front dial. Whilst I was dismantling the unit, waiting for the dial to arrive from Dillen, I started checking and replacing the electrolytics.
Long story short, reassembled, plugged in, nothing.........
Everything lights up OK. No "hot" burning smells or smoke. No electrolytics exploding but also absolutely no sound from the speakers. It's no sound for all inputs: radio (AM & FM) and tape.
I notice that the "radicator" is not moving and is off the top of the scale and there is a new buzzing sound from this region of the unit.
I have replaced two problematic transistors (TR116) that I also got from Dillen.
Now I'm stuck. I do not have the first clue on how to troubleshoot this unit.
All the boards are plugged in as are the speakers in the BM's cabinet. There's no obvious broken or unsoldered wires hanging loose. All electrolytics were put in correctly observing the correct polarity (the unit is a +ve earth).
The two globes come on, though their brightness seems to be flickering somewhat. I might have stuffed up the replacement of the two transistors. Would a mistake with them lead to this sort of outcome.....??
Help..........!!
The buzzing sound could come from the transformer. That's not uncommon.
You have email.
Martin