On 5/23/2016 3:54 PM, Dave M wrote:
Dan,
If you haven't already found the Z3801A page at
http://www.realhamradio.com/GPS_Frequency_Standard.htm, you should
read it thoroughly (in your case, especialy the section on the power
supply). there is a good pictorial that shows locations of all the
power supply test points. Using that pictorial, you should be able to
determine which power supply is causing the problem (there are several).
Dave, it's completely dead. I do have a schematic of the board (of
uncertain origin), but I suspect it is one of the DC/DC convertors that
is dead. It just puts the power supply I'm feeding it from into tick
mode but I can't find any obvious short anywhere. It could be a
Tantalum inside one of the aforesaid convertors, but it's not blown any
pico fuses.
I will continue to puzzle over it...
Dan
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