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  IBM 300PL Power Switch/LED Connector (J27) Pin Assignment 
 
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Michael Kim Jul 22, 2004, 11:05am EDT Reply - Quote - Report Abuse
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I recently inherited a motherboard pulled from an IBM 300PL (Model 6565 with slot1 CPU) that I want to put into a generic case with all separate wires for power switch, reset switch, power LED, HDD LED.

The motherboard has a proprietary Power Switch/LED Connector (J27). Does anyone know the pin assignments so that I can hook this thing up right? Please let me know if anyone knows anything about this board.

Thank you!


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Peter Whitehead Jul 22, 2004, 04:59pm EDT Reply - Quote - Report Abuse
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>> Re: IBM 300PL Power Switch/LED Connector (J27) Pin Assignment
Hi
If its only the led pin config you want, and there is only two pins, just place it on, if it does not light swap it round, it will not blow, or should I say I have never had one go on me, and I have had to guess a lot lol

Mark Ess Sep 20, 2006, 05:51pm EDT Reply - Quote - Report Abuse
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>> Re: IBM 300PL Power Switch/LED Connector (J27) Pin Assignment
I came across this post while looking for the answer to this question myself. Does anyone know the answer on this one? Google and IBM support site searches haven't been too helpful. Thanks all!

mark

Michael A. Sep 21, 2006, 11:19am EDT Reply - Quote - Report Abuse
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>> Re: IBM 300PL Power Switch/LED Connector (J27) Pin Assignment
I came across this post while looking for the answer to this question myself. Does anyone know the answer on this one? Google and IBM support site searches haven't been too helpful. Thanks all!

mark


Could you possibly take a photo of the connector and cables you have to work with? I couldn't find anything online either.

Michael A.
Website: http://itnode.net
Mark Ess Sep 21, 2006, 07:48pm EDT Reply - Quote - Report Abuse
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>> Re: IBM 300PL Power Switch/LED Connector (J27) Pin Assignment
Thank you for the reply. I'm unsure how to load a photo here? In any case, I'm using a generic MicroATX case with an IBM Motherboard (FRU61H2569) which was used in many PC 300 series, Slot 1 computers (PIII- 533MHZ and up).

Power/LED connector on this board is a single row of 8 pins. Pin spacing is right to accept connectors (LEDs, Power Switch) from the ATX case, but I'm unsure which pins are which.

Puzzling through a foreign language post I Googled makes me think that pins 5-6 are Power LED, and 7-8 are HDD Activity, leaving pins 1-4. I can also see from the surface layer traces on the board that pins 5 & 8 are connected. Other than that, I'm unsure. I'd experiment, but don't want the low voltage soft power signal to fry anything while I'm puttering.

Thanks again.

Mark

marvin coimhead Oct 14, 2006, 09:56pm EDT Reply - Quote - Report Abuse
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>> Re: IBM 300PL Power Switch/LED Connector (J27) Pin Assignment
hi,

use this info at your own risk,
and if you are not familiar with the concepts;
find someone who is.

i have a mb from a ibm 6563-95u with the 8-pin connector

a multimeter tells me that:

pins 1 & 2 are connceted to one set of the n/o (normally open) contacts of the power switch
pins 3 & 4 are connceted to the other set of the n/o (normally open) contacts of the power switch

on the other end (the mb);
pins 1 & 4 (yellow) are tied together and
pins 2 & 3 (black) are tied together

logic tells me that the power switch
(which is actually two switches, or dual pole)
is simple redundant

since most generic cases only have two wires,
the connector should be able to be connected to either:
pins 1 & 2
or
pins 3 & 4

as far as the remaining wires,
pins 5 & 6 (green & black) are the power led
pins 7 & 8 (yellow & black) are the hard drive led

typically black is negative (-) or ground,
colour is positive (+) or voltage;
if the led does not illuminate,
reverse the connector.

the above,
or any varialtions can be confirmed on any other systems
with a multimeter.

again if these concepts are not familiar,
or you are not experienced with using a multimeter;
find someone who is.

thanx
;r


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