HP 9100 Fault was: Re: Tube experts! - I T WORKS!

From: Joe <rigdonj_at_intellistar.net>
Date: Sat Dec 4 21:12:52 1999

At 12:42 AM 12/5/99 +0000, Tony wrote:

>Reminds me of what can happen when the CRT in an HP9100 develops an
>internal short. It blows transistors all over one of the deflection
>boards, and then applies about 220V to the outputs from the processor
>chassis. This generally wipes out a number of diodes on the gating board,
>and if you're unlucky kills some transistors on a flip-flop board, some
>transistors on the ROM address decoder, etc.


   Hmmm. That sounds like BAD news! Is there any way to prevent a tube
short from frying everything around it?

   Joe
Received on Sat Dec 04 1999 - 21:12:52 GMT