IBM 5155 Power supply schematics or info

[Joe R.]

At 12:34 PM 11/17/05 +0000, you wrote:
>On Wed, 2005-11-16 at 16:21 -0800, Chuck Guzis wrote:
>> On 11/17/2005 at 12:43 AM Alberto Rubinelli - A2 Sistemi wrote:
>> 
>> >As soon as I touched the trimmer, I discover the problem !! The cursor was
>> >instable !!
>> 
>> Congratulations!
>> 
>> One of life's hard-learned lessons:  On old equipment, pots, switches,
>> sockets and connectors are not your friends.  
>
>pots normally seem to be OK though *until you touch them*, as the wiper
>still has good contact until it's moved onto a corroded spot. Personally
>I've found it unusual to find one that's failed without even being
>touched. 


   The monitors in the Intel MDS systems frequently have the exact same
problem. Move them slightly and the problem disappears!

    Joe


>
>(sockets and connectors seem much more prone to vibration or heat-
>related movement, and of course switches always live with some of their
>contacts exposed to corrosion anyway)
>
>cheers
>
>Jules
>
>