OK, I'll add what I learned ... in this case it was a Herc II with
the 9420 power supply ... totally DEAD ... no dial light, fan, etc
... THANKS to Ken, and especially John, G3JAG, and Garry at
Ten-Tec ... the problem was found to be U1, a 7815 regulator.
Perhaps this will help there?
73 de Billy, AA4NU
----- Original Message -----
From: "Ken Brown" <ken.d.brown@hawaiiantel.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>; "Billy Cox"
<aa4nu@ix.netcom.com>
Sent: Saturday, November 01, 2008 18:49
Subject: Re: [TenTec] 9420 power supply
Hi Tom,
Another guy has been working on a 9420 lately, and had problems with
it turning on at all. I believe he discovered at failed IC in the control
board. Perhaps if the two of you corresponded directly you could help each
other.
Here is his email address:
aa4nu@ix.netcom.com
Have you tried powering the Omni VI with a separate power supply? There
are two ways that the 9420 can get turned on, one is by the transceiver
and one is directly from the Hercules. I have an Omni VI and Hercules with
9420 power supply, and have never powered the Omni VI from the 9420,
always use a 962 to power the Omni. I wonder if the glitch that is giving
you trouble might happen only from the Omni VI initiating turn on of the
9420. If you have another power supply for the Omni it might be a fairly
easy thing to try.
Ken N6KB
Tom Macon wrote:
I have a Hercules II amp with the 9420 power supply that's having
problems. 1. When the amp is switched on, the Overload light comes on
immediately.
2. When trying to run the tranceiver (Omni VI) from the 9420, there is a
loud relay buzz from the 9420 followed by something tripping out. This
happens regardless of whether the amp is plugged into the 9420.
The first problem appears to be voltage spike from the 9420 that trips
the overvoltage circuit in the amp. I've been able to capture a 20v
spike at turn-on but can't determine which of the four supplies is
causing it.
The second problem occurs with either the Omni or a resistive load
plugged into the transceiver connector. Evidently something trips
because when the buzzing stops (after a couple of seconds), the output
voltage is about 0.62v.
It's very difficult to troubleshoot the 9420 because of limited access to
it's internals and it can't be run in a partially disassembled state
because many of the cables are too short. I'm hoping someone is familiar
with the beast will have suggestions to help me zero in on the
problem(s) - they will be greatly appreciated!
Tom Macon, K9BTQ
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