[Elecraft] SS-30DV dc-power supply problem

[R.Shanks]

When I turn on this supply (SS-30DV) the fan turns on briefly then off. 
I assumed this was normal and it would turn on if the temp. increases 
etc. However the supply would turn off after a variable period of  time 
(~20 min) and then after about 10 min I was able to turn it on again!! 
Since the fan was not turning on I thought the supply was over heating 
and the over-temp. protection cct. would trip before the fan would come 
on. This is not the way it should work of course. The temp. sensing cct. 
should turn the fan on long before the over-temp cct. Oddly, at times, I 
could run for 3-4 hrs and it would not trip! My station is a Kenwood 
710GA, 50w dual band, I use VHF 90% of the time. Has anyone experienced 
this problem with this supply? I'm a retired elec/tech, if I could get a 
schematic I could trouble shoot it, the fan or fan cct is not working 
properly, this may have been the problem from the getgo hard to tell as 
it worked fine for about 8 mo.

73 Richard

VE7PNP