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Re: [TenTec] Orion II Won't Power Up

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Orion II Won't Power Up
From: Gary Follett <dukeshifi@comcast.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sat, 18 Jan 2020 22:02:47 -0600
List-post: <mailto:tentec@contesting.com>
Added info: If D116 is shorted, it will not pop the fuse because it is looking 
at a 1K load resistor. If you did get a transient at the antenna, it is not 
unreasonable to think that D116 would fail.


It is possible Q77 failed as well but that is a really common 2N3904.

Gary



> On Jan 18, 2020, at 9:55 PM, Bernie Skoch via TenTec <tentec@contesting.com> 
> wrote:
> 
> Thanks.  Where and what type is D116?
> 
> 
> -----Original Message-----
> From: Gary Follett <dukeshifi@comcast.net>
> To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
> Sent: Sat, Jan 18, 2020 9:47 pm
> Subject: Re: [TenTec] Orion II Won't Power Up
> 
> The 5KP15A device is designed specifically to protect sensitive electronic 
> equipment from voltage transients induced by lightning and other transient 
> voltage events. Its job it is to short the supply of the transient to ground 
> in a picosecond (1E-12 seconds).
> 
> Failure of this part in the open mode would have no effect on radio 
> operation. If shorted, it would pop the main fuse, but only if the relay K1 
> were on. Since you do not hear that relay clicking on, the transient 
> suppressor is not even in the circuit.
> 
> If D116 were shorted, it would put Q77 base high, pulling Q23 base low. This 
> would override the Power Switch turn on signal at J8 on the I/O board and 
> this would prevent the power switch from turning the radio on.
> 
> Gary
> 
> W0DVN
> 
>> On Jan 18, 2020, at 9:14 PM, Bernie Skoch via TenTec <tentec@contesting.com> 
>> wrote:
>> 
>> 5KP15A
> 
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