Chris,

If it blows as soon as the mains plug is inserted into the wall outlet, it could be the mains transformer that has shorted windings.

If the fuse first blows when taken out of standby it's probably a shorted output stage.

Martin

I had the same symptom with a BM6500.  Of course, that doesn't mean it was the same problem  .  For me, it was the vertical silver can-type capacitor near the fuse.  (On page 10 of the service manual you'll find this to the right on the rectifier D3).  Page 19, lists it as a 4700uF -10 + 50% 16V Cap.  However, as it's an older receiver and that is a large electrolytic capacitor, you may want to check it first.

 If you have the service manual (available to Gold Members) you should be able to isolate the issue fairly quickly.  Since you know the fuse is blowing instantly, start from there and check every potential path to ground.  

 Good Luck!

 -Rob 

That's great stuff guys,

                                the mains transformer was one of my suspects (yes Martin it does blow as soon as power is supplied) and the info' on the capacitor to check first is great.😕

Chris.

Yes, the large PCB mounted cap ! I also remember replacing one of these. If that is indeed the problem, you should also check (or replace) the associated rectifier.

Martin

Yep, I replaced the rectifier too - forgot to mention that.

Thanks Martin!

-Rob 

Brilliant!

I'll keep you posted🙂

Chris.

Right,

         I've checked the power supply/transformer which is fine and removed the board and identified the problem to be the Cap as suggested. Next question is where to get the replacement capacitor & bridge rectifier from.

Chris.

Hello Chris, I'd suggest you get yourself down to Farnells or RS, just the road from you.

Do you have an account with them, if so you can order and then collect, otherwise you'll have to wait for delivery - in 24 hrs.

Thanks Dave,

                     I've found what I need at Farnells but may have a look at RS and see if they have owt.

Chris.