[Tfug] NEC Motherboard

[erich]

Interesting,
      Especially the stuff about NEC. No this machine is not that. I has
two mini-DIN
connectors in a little metal enclosure.  One above the other. The metal
shroud is
soldered in, so I am reluctant to tamper with that. You should see this
thing. It has
a motherboard with an edge connector and tracks. Unplug the Pentium II, take
the PCI cards out, and the motherboard slides right out of the box. Oh,
yes, I did
that, plugged it back in fired it up, and it's still the same problem as
described before.


      No, I sort of "wing it" when it comes to ESD. I just avoid tuching
metal conductors.
and I have some ESD-spec-ed sheeting to place ESD sensitive parts for
examination.

                                                                       
                             Erich
     
john galt wrote:

>----- Original Message ----- 
>From: "erich" <erich1 at copper.net>
>To: "Tucson Free Unix Group" <tfug at tfug.org>
>Sent: Tuesday, January 09, 2007 9:26 AM
>Subject: Re: [Tfug] NEC Motherboard
>
>
>  
>
>>OK,
>>   I looked for obvious things already, (Pardon the typos
>>if any.
>>There's a cat on my lap),
>>such as jumper sockets without jumpers in them, but that
>>seems ok. The
>>mouse &
>>keyboard sockets are combined in a little metal enclosure
>>that sticks
>>above the plane
>>of the motherboard. I think a keyboard signal requires 2
>>conductors
>>while a mouse
>>requires three. Is this correct?
>>
>>
>>Erich
>>Adrian wrote:
>>
>>    
>>
>>>On Monday 08 January 2007 20:00, erich wrote:
>>>
>>>
>>>      
>>>
>>>>   I have an old NEC Powermate 8100 with a Pentium II
>>>>motherboard.
>>>>Today I decided
>>>>to dust it out. I do this by taking the exaust nozzle
>>>>        
>>>>
>>>>from a canister
>>>      
>>>
>>>>vacuum cleaner. This
>>>>provides a hi-speed jet of air to blow out  the dust from
>>>>the
>>>>power-supply/motherboard.
>>>>
>>>>   Anyway I plugged it back in & fired it up, and now
>>>>weird things are
>>>>happening. The
>>>>keyboard will work when it's connected to the ps2 mouse
>>>>port. The mouse
>>>>doesn't
>>>>work at all. This is bad. The x-server won't come up if
>>>>doesn't detect
>>>>mouse input.
>>>>
>>>>   Any ideas?
>>>>
>>>>
>>>>
>>>>        
>>>>
>>>Two... One, there is a piece of debrie caught under a chip
>>>shorting out, or
>>>perhaps even inside the connector preventing the pin from
>>>contacting.
>>>
>>>The other ugly thing is that you killed the circuit by
>>>static discharge from
>>>the exhaust... Though I would expect something more than a
>>>non-working mouse,
>>>like failure to boot at all.
>>>
>>>Adrian
>>>      
>>>
>
>
>Number one on the google hit parade is:
>http://tinyurl.com/ev21
>This says the answer is four conductors.
>
>I like the static theory and the dirt theory.
>
>The weather was pretty dry today.
>http://tinyurl.com/jtcqy
>
>Dirty dry air moving fast through a plastic hose sounds like
>a staticky situation.
>
>I wonder if Raytheon teaches ESD classes.
>
>If all else fails and you feel like blowing the cash, maybe
>you could add a USB adapter plus mouse or keyboard
>
>
>
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>  
>