ASTRON

If you have been having trouble with ASTRON POWER SUPPIES blowing fuses,
pass transistors, and the 723 voltage regulator chip, on a regular basis,
then try this simple remedy:
Put an electrolitic 100 mf @ 25 volts from the GATE to the CATHODE of the
Over Volt Protections SCR.
At first, I thought this problem to be bad switches, causing such an enorm-
ous spike, that it was not being regulated and therefore telling the SCR to
"KILL" the AC input fuse. But then, with it happening more and more, it
must have put a strain on the various other components. The 723 Voltage reg-
ulator can be abused only so much ! The output can be shorted many times
and all that usually happens is the Supply Folds Back and takes the drive
away from the Pass Transistors. What is really happening when the SCR FIRES,
is, the output of the supply is being forced to OVER CURRANT and VOLTAGE
FOLDBACK in such a manner,therefore "KILLING" the input fuse.
That's why we should only stick to the recomended value.
I will try to find out why the ASTRON's own protection capactor is not
accomplishing what my remedy has. Maybe in the last few years, they have
used a lower rated cap.
Anyone out here with anymore Helpful Hints, reguarding POWER SUPPLIES,
please, by all means, may I hear from you ? POWER SUPPLIES are my second 
Hobbie ! Thanks es Send Replies & Info to:
KB7KBT @ KB7KBT OR.USA.NA
73 ALL........................GARREY***