Connie Marshall skrev:
The heat sink on the back of my 5370B runs very hot. Can't touch it for more
than a fraction of a second. Maybe some where around 140F. I assume this is
not normal??
Sounds a little too hot (C would give me better indication). Check the
regulated and unregulated voltages. There are 4 transistors there. Do
you have the manual? There's a PDF for it and you want to check out the
A6 board (which often is described together with A1).
+10V is regulated into +5 V and fuse is for 7 A. So about 35W is burned
in Q2 before fuse blows.
+20V is regulated into +15 V and fuse is for 1,5 A. So about 7,5 W is
burned in Q1 before fuse blows.
-20V is regulated into -15 V and fuse is for 1,5 A. So about 7,5 W is
burned in Q3 before fuse blows.
-10V is regulated into -5.2 V and fuse is for 7 A. So about 33,6 W is
burned in Q4 before fuse blows.
So about 80-85 W may need to be fumed out without having the fuses blow.
More if the power-plug is put in 100 VAC rather than 120 VAC.
A well designed switch becomes muke warm, and it makes minor wonders for
reliability. :)
Cheers,
Magnus
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