Interesting about the transformer failure, specially the dual primary
condition. I would suspect the failures could be caused by spikes due to
either power system switching or surges induced from near-by lightning.
Sometimes where a strike take place miles away.
To me this would indicate that one should implement a "whole house" surge
protection system. It would never hurt plus it adds protection to
everything in the house. These items are available from places like Lowe's
or Home Depot in their electrical department. They are often described as
"secondary surge suppressor" and are added to the main breaker panel. Cost
is around $35 or so.
Although easy to install, if you aren't comfortable working in the panel,
then have an electrician install the device.
73
Bob, K4TAX
----- Original Message -----
From: "Rick W" <ve7tk@yahoo.ca>
To: "Ten-Tec Reflector" <tentec@contesting.com>
Sent: Saturday, June 08, 2013 11:43 PM
Subject: [TenTec] 9420 PS Problem
Well this must be my month for power supplies. I just finished fixing my 32
amp Alinco switching supply and today another PS problem.
This morning I turned on the rig to work a new one and hit the switch on the
Hercules II. Nothing happened! No lights -- nothing. I checked the line
fuses to the 9420 and they were fine. I checked the internal fuse on the
Herc and it too was fine.
I decided it must be the 9420 so I dug into it (damn this thing is heavy).
Well would you believe there is a fuse on the power supply controller board.
I thought that MUST be the problem. Unfortunately it too was good.
After some more digging I found that T5 on the controller board (Figure 4-5
of the manual) was dead. Both 110 VAC primaries were open. (I run 220 VAC
and these windings are in series). This transformer feeds a couple of
diodes, a filter and a 7815 regulator. It provides the +REG voltage and turn
on voltage for the controller relays. I am still a little concerned that
BOTH primaries failed.
I removed the transformer and applied 18 VDC to the 7815. When I turned on
the Herc it came to life.
Unfortunately there are no specs on the transformer in the manual and no
markings on the item itself. Would anyone on the reflector have any ideas of
what might make a decent replacement. (I will give TEN-TEC a call on
Monday.)
My plan is to use my variable power supply to apply a voltage to the
regulator until a replacement transformer can be found.
Thoughts or comments welcome.
73,
Rick
VE7TK
Website: http://www.ve7tk.com
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|