----- Original Message ----- From: "Adrian Graham" <agraham(a)ccat.co.uk> To: <classiccmp(a)classiccmp.org> Sent: Monday, July 17, 2000 7:17 PM Subject: Mac Classic analogue board sound should've the it Haven't seen this in a Classic myself, however violent fuse blowing of that nature generally points to a problem in the mains side of the supply. Frequently the diode bridge, (or one the 4 diodes arranged in a bridge) that rectify the mains voltage is/are shorted. This is straightforward to replace and generally there are no other components affected. It could also mean however that the switching transistor/scr/whatever is crook, they are a little more expensive, but provided you can procure the right one ok, no real fuss to change, however you should bear in mind that when this happens, sometimes there are other components that get fried. I have seen one switch mode supply where fuse vaporising was caused by a very dead electrolytic (mains rectifier filter cap) but that's a little unusual, usually they just get a bit leaky if anything. Cheers Geoff Roberts Computer Systems Manager Saint Mark's College Port Pirie, South Australia geoffrob(a)stmarks.pp.catholic.edu.au netcafe(a)tell.net.au ICQ: 1970476