[Test-Equipment] re: Does my 141T have a terminal illness?

[jeremy-ca]

Thanks Alan, will do.

Carl
KM1H


----- Original Message ----- 
From: "Alan Melia" <alan.melia at btinternet.com>
To: <test-equipment at mailman.qth.net>
Sent: Tuesday, July 31, 2007 5:40 AM
Subject: [Test-Equipment] re: Does my 141T have a terminal illness?


> Hi Carl dont panic too quickly  :-))
> The sweep is quite dependent on the correct psu voltages. The 141 frame 
> has
> a habit of cooking some of the resistors which drift high. You will need a
> 141T manual from one of the several free sites and then before doing
> anything else check and re-adjust the 4 power rails to spec. They must be
> done in the correct order, as in the manual. I suspect the -12v rail as 
> this
> provides a reference for the schmidt that trips the sweep. I had a similar
> effect on one of my frames which would not sweep below 10ms.
>
> Good Luck with it
> Cheers de Alan G3NYK
>
>
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