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<DIV>Lee</DIV>
<DIV> </DIV>
<DIV>There are a couple of things to check. </DIV>
<DIV> </DIV>
<DIV>First are the air filters clean below the power supplies? Very
important for cooling.</DIV>
<DIV> </DIV>
<DIV>Second, are all the fans turning? Pull the filters and use a small
mirror to check. These have a tendency to stop or get so sluggish.
Or you can pull all three supplies and see if they are turning. The first
method is easier other than for us old folks having to get down on the
floor.</DIV>
<DIV> </DIV>
<DIV>Third, are the shunt resistors strapped correctly. If you have added
or removed any accessories, this can cause a problem. So if you have
disconnected the Editor, Erase amplifier, or other items, follow the procedure
in the manual.</DIV>
<DIV> </DIV>
<DIV>Lastly, check the capacitors in the supply, signal system, and Intersync to
see if you have an issue there. There might be a load on the +12 volt side
that is drawing more current.</DIV>
<DIV> </DIV>
<DIV>Chris Hill</DIV>
<DIV>WA8IGN</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 6/28/2011 3:05:20 P.M. Eastern Daylight Time,
lasvegastvengineer@yahoo.com writes:</DIV>
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<DIV>I have been working on a VR1200 and noticed that the +12V power
supply transistors run noticeably hotter than the -12, 24 and 135
transistors. </DIV>
<DIV> </DIV>
<DIV>Is this normal for a 1200? </DIV>
<DIV> </DIV>
<DIV>Thanks </DIV>
<DIV>Lee
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