Some one hooked up the input DC with wrong polarity. The main fuse is blown, replaced fuse . The input diode checks good can't find other problems. This set is small and hard to work on, hoping some else has had similar problem or print. I can't find a print for this model showing in download section. All the boards have to be disconnected to replace the fuse, then put back to confirm operation! help appreciated. thanks Bruce. B&T Electronics 139 Margaret St Sarnia Ontario Canada N7T 2Y3 519 344 1850 ----------------------------------------------------------------------------- Lost Password: http://www.tech-assist.org and select "Login Problems?". Email Archives: //www.freelists.org/archives/techassist/