Jeff, Is there a protection circuit in that? (heat, overcurrent, etc) The Peavey amps that we used in the band would sometimes blow those, then be as if dead. Doug Jeff Dougherty wrote: > > Thanks to Don for faxing me the schematic. Some of the info is hard to read. > (Original info below) > If I jump the relay, I do have 60v on output transistors and on main big > capacitors, but it still appears to be in stand by mode. > Any other suggestions before I give up on this one? > Jeff www.9-11-2001tragedy.com > Help those affected by the NY/PA tragedy: > The Red Cross needs is mobilizing a national blood drive and needs your > help. Please call 800-GIVE LIFE, to find out where in your area you can > donate blood. > FAX 1-413-280-0677 > Intrepid Video & Electronics > Harrisburg, PA 17111 > 717-909-8844 > www.intrepid-video.com www.tech-repair.net www.thetoolcaddy.com > > First, pressing power only lights the power standby light. Power LED is not > lit. > Power button is push switch, so no micro. > Power Relay, no click, has 12 vdc on each side to ground, AC side has > 120vac. > Output transistors are not shorted and do not test open. Two small > transistors, on same heat sink measure about 40 ohms from base to coll. > I did not find any open resistors, shorted caps, or open/shorted diodes, of > course, I may have missed one. > Heat sinks all check OK, no open traces and I looked very closely. > > Help make your TechAssist online repair tips > database better! Submit your fixes here: > http://www.circuitwork.com/techassist/tip/#tips > To unsubscribe write to: > techassist-request@xxxxxxxxxxxxx > with unsubscribe in the subject line. -- Wis-Kel Electronics 101 Freeland Ave. Terra Alta, WV USA 26764 1-304-789-5889 Help make your TechAssist online repair tips database better! Submit your fixes here: http://www.circuitwork.com/techassist/tip/#tips To unsubscribe write to: techassist-request@xxxxxxxxxxxxx with unsubscribe in the subject line.