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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 21:47:40 -0600
List-post: <mailto:tentec@contesting.com>
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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