Dave,
You are confirming what I thought....that the switch might be the source
of the problem. Actually, I checked it after pressing both top and
bottom of the switch. next is taking the top off the PS and going to
work. I had been using the the Omni but running off my switcher that I
use as a station supply, so I never before had checked the 280, my bad.
Of course when I loaned the Omni and supply to a friend nothing worked.
Switches seem to be the bain of my existence. I have one of those power
distribution strips (like MFJ but labeled Tenma.) Worked fine for a
long time but it appears that I loose continuity through the low power
side when I get up around 8-10 amps there. I will check them both out
and jump into the Mouser/MCM catalog to see what is available in a
lighted switch, if that is the problem in them both.
John Graves
WA1JG
jh.graves@verizon.net
On 3/9/2011 10:10 AM, d.e.warnick@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@verizon.net>
To: "Discussion of Ten-Tec Equipment"<tentec@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.
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