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
>> _______________________________________________
>> TenTec mailing list
>> TenTec@contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec
>>
>>
>
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