On Astron supply- I had similiar problem with start up. You might want to 
look at the control circuit board to see if R1(x) a 20 ohm and R3(x) a 10 K ohm 
are installed. I had problem when the Automatic OVP Reset Circuit was installed 
on an old Astron supply.  From Astron notes: The OVPR-12V when installed in a 
12 VDC power supply  automatically reset the power supply if the over voltage 
protection circuit is tripped by lightning or line transients. A phone call 
to Astron said to check for installation of R1 and R3 and my circuit board did 
not have them. Hope this helps.
Gary K2UQ
 




 
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