On Fri, 18 Dec 2009 10:06:44 -0500, Garey Barrell wrote: >Jim's suggestion to check the 24 VDC supply is a good one. A common >cause of failure is the top "half" of the DC-DC converter transformer >core falls off, or just becomes separated enough to cause the voltage to >drop. Looking at the "top" of the transformer on the Power Supply board >(one with the pots), you should see a solid bar. If you see three >"ends" of an "E" sticking up, look for the top half of the "E" shaped >core in the bottom of the case. If gone, replacements can be had from >Charlie, K3ICH.
Thanks, Garey! :) I would add to that, as long as the OP has the board out and is working on it, replace any electrolytic capacitors with new 105C teperature rated caps. These caps are getting old, and can cause some interesting operational anomalies when they start to go bad. 73 -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! "Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime." HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://radiojim(dot)exofire(dot)net http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
