[TenTec] Dead TT 280 PS

[John Graves]

Well, so far I proved that wiggling is legit way of fixing some things. 
  After wiggling a few wires I now have 110 AC on the white wires and I 
can see that I still don't have the supply working. The front panel 
switch is good.  I tried jumpering the white wires with a test lead with 
small alligator clips...No luck .  then I tried with some 14 or 16 ga 
wire...no luck.  I did test the continuity on both white wires back into 
the supply and they tested good. It was 35 deg here and my shop is in 
the unheated garage, ie, my hands got cold enough to hurt so I will 
puzzle on this some more and try again tomorrow.

John Graves
WA1JG
jh.graves at verizon.net

On 3/9/2011 10:10 AM, d.e.warnick at comcast.net wrote:
>
>
> I'd bet on the PS switch being open (is it turned on?)
>
>
>
> If you have no voltage on the 2 white wires with the PS plugged in and the switch on, look at the primary circuit.
>
>
>
> One white wire is connected to the AC line through the fuse. Check continuity there
>
> The other white witre connects through the PS Switch and the primaries of the transformer. Check continuity there.
>
>
>
> Check the PS switch for continuity
>
> Check the fuse&  fuse holder combination for continuity
>
> Check the transformer primaries for continuity and correct 120v/240v connection
>
> Check the power cord for continuity
>
>
>
> ALL CONTINUITY CHECKS WITH THE PS UNPLUGGED, OF COURSE
>
>
>
> 73
>
> Dave
>
> WA3F
>
> ----- Original Message -----
> From: "John Graves"<jh.graves at verizon.net>
> To: "Discussion of Ten-Tec Equipment"<tentec at contesting.com>
> Sent: Wednesday, March 9, 2011 9:55:08 AM
> Subject: [TenTec] Dead TT 280 PS
>
> I loaned out my Omni-D and 280 supply but it appears that the PS is not
> working. The meter light does not come on. I checked the voltage on the
> 2 white center wires on the connector and found no voltage.  The
> external fuse checks good.  Any suggestions on where to go next?  I do
> have a copy of the manual with the 280 schematic so that helps.