[R-390] 75A4 PTO Repair

[Steve Hobensack]

Look for a shorted screen capacitor.
..Steve..N8YE


>:> Message: 1
> Date: Mon, 14 Jan 2008 22:14:00 -0500
> From: "David C. Hallam" 
> Subject: [R-390] 75A4 PTO Repair
> To: "R-390 at mailman. qth. net" 
> Message-ID: 
> Content-Type: text/plain; charset="iso-8859-1"
>
> Can anyone give me advice on the repair of the PTO in a Collins 75A4
> receiver? I have one that has low output and is nonlinear. According to
> the information I have, the output should be approximately 6 V and linear
> through its range of 1.955 MHz to 2.955 MHz. The one I have has an output
> of about 1.8 V at the low end and 1 volt at the high end.
>
> What can cause this and how do I correct it?
>
> David
> KC2JD/4
>
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