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I need to replace a part and cannot read the part number

What is the part number of the 8-pin dip on the bottom of an IBM R51 27K9926 mainboard near the printer connector? It is marked 'Q4'. The only numbers I can make out are these 3 lines:
f p46??

I am trying to fix the MB, not replace it.

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Hi res0m9hv,

HERE's the maintenace manual that lists all the p/n on the board.

Good Luck


Posted on Nov 24, 2009

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What operating system does it use?

The problem is whether you're using hardware RAID or software RAID.

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Nedd pin out for system header on m810dlu

Click on the country name nearest yours.

Opening comes up on the right in a small window.
Make sure the circle to the left of Save File has a green dot in it.
If not, left-click in the circle to the left of Save File.
Now click on OK.

A small window comes up on the left. Double-click right on the file name
In the next small window go to the left side, and click on Extract all files.

Click on Next, Next, and Finish.
Close the other two small windows, and keep the recent one.
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As it is a Microsoft Word document, it takes a few seconds for Microsoft Word to load, and the motherboard manual.

[If you don't have Microsoft Office, you can always use OpenOffice for free. MUCH better program than MS Office ]

Page 10 - Mainboard Components
SW1 is the Front Panel header. It is in-between the CMOS battery, and the Floppy Drive cable connector.

Motherboard installed in computer case, SW1 is parallel to the bottom edge of the motherboard, and has two rows of pins.
4 pins across the Top row, 5 pins across the Bottom row.

Pin 1 is on the Bottom row, and is all the way to the Left.

The pins on the Top row are numbered EVEN.
The pins on the Bottom row are numbered ODD.

Starting on the LEFT side going towards the Right, Top row;
Pins 2, 4, 6, and 8. There is NO pin 10.

Starting on the LEFT side going towards the Right, Bottom row;
Pins 1, 3, 5, 7, and 9.

Page 15 - 2: Mainboard Installation

A) Pins 1 and 3 are for the HarDDrive activity LED (Light)
Pin 1 is for the Positive ( + ) wire.
If the HDD LED is dim when the harddrive is active, switch the wires around.

B) Pins 5 and 7 are for a Reset switch, IF a Reset switch is used.

C) Pin 9 is reserved for the factory, and N/C. Not Connected.

D) Pins 2 and 4 are for the Power On LED (Light)
Pin 2 is for the Positive ( + ) wire.
If the PWR LED is dim when the computer is on, switch the wires around.

E) Pins 6 and 8 are for the Power On switch.

F) No Pin 10.

For additional questions please post in a Comment.


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1 Answer

Front panel configuration

Motherboard installed in computer case;
Processor to the Top, 3 Ram Memory slots to the Right, 5 white PCI slots to the Bottom;

Down in the Bottom/Right corner, is JFP1, and JFP2.

The Front Panel header is JFP1. (Junction Front Panel 1)
The header with two rows of pins, and is positioned Horizontal. It is parallel to the bottom of the motherboard.

(The other Front Panel header is JFP2. It is positioned Vertical, and is above JFP1. You may be using it also. Read on)

There are two rows of pins for JFP1.
5 across the Top, 4 across the Bottom.

The pins on the Top row are numbered ODD.
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Top row, starting from the Right side, going towards the Left;
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Looking at JFP2. (Junction Front Panel 2)
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Starting at the Bottom on the Right side, going Up;
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Hi, here you can read info and download drivers
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okay guys i found i new way to reset the pass with only a screwdriver …
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