On Thu, 28 Jan 2010 14:44:21 -0000, Adrian Rees wrote: >I went back to basics on this and checked out the power board. On Pin 21 of >the power supply board I am measuring 22.6 Volts, when according to the >schematic it should be +26v DC Reg Out.
The PS board uses a 78L24 3-terminal regulator IC, so the output should be real close to 24 volts. Before you get too excited about the transformer, have you replaced electrolytic capacitors C2109 and C2110? These radios are getting old enough that the caps are starting to fail, and they can cause some strange problems. 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
