+5V busted on PCI-6259?

[Henry A]

I have a PCI-6259. The DAQ card contains a self-resettable fuse.

The +5V line was connected to GND for a long period of time on connector 0 (<3 hours) and for a short period of time (< 30 seconds) on connector 1. 

Now the output only reads around +3V with no load.

I thought the card is always protected from shorts. I know it is because I tested this feature awhile ago and it did indeed reset.

The card is connected to a CB-68LPR connector block. All connections on the block were disconnected.

I have tested the Digital I/O and it is still functional.

Any help is appreciated. Thanks!

Message Edited by Henry A on 12-22-2008 05:36 AM

Message Edited by Henry A on 12-22-2008 05:40 AM

[Henry A]

Actually, it may not have been tied to Ground, but it did pull alot of current.

[Henry A]

Ugh.. time limit for editing threads... heh

I was reading some threads and one person said that the +5V line is not generated on board, but is pulled from the PCI slot with a resettable fuse between the PCI slot and the DAQ output. Is this also the case for the PCI-6259 card? Maybe the voltage regulator on the MB died?

[Henry A]

More findings: (I seem to be responding to myself)

I moved the card to another PCI slot and then to another computer. Still no go.

Then I took the card out and measured the fuse and it shows mega ohms of resistance, which mean it is blown.

I thought it was a resettable fuse, it doesn't really look like one.

[dousley]

Hi Henry,

What revision of the board do you have?  I'm asking because I want to make sure I'm looking at the right parts.

Daniel

Conditioned Measurements Hardware 

[Doug_L._Bear]

There is a KnowledgeBase article that seems relevant to the issue you are having. 

http://digital.ni.com/public.nsf/allkb/E48B7DDC4EA9DE0886257333005C28FE?OpenDocument

I know you only stated that your short was occuring for 3 hours and this article mentions shorts of greater than 1000 hours but it seems as if this is what you are experiencing.  If you do feel that this is an RMA please contact National Instruments.

[Henry A]

Daniel: Where is the revision number located at? I do not see it anywhere on the board. There is a sticker that says 6259(A). Maybe rev A?

Doug: I did see that document. 

I asked a co-worker of mine to check another 6259 board (I'm working abroad right now) and that one does have the typical green resettable fuse. It also measures < 1 ohm which is good.

[Henry A]

My board is of Revision D.

(7th digit in part number)

Message Edited by Henry A on 12-24-2008 01:26 AM

[dousley]

Hi Henry,

The rev D of the 6259 uses a different fuse than previous revisions, that is why it looks different. The rev D fuse is not resettable. So, coupled with the fact that you are measuring megaohms on that fuse, it looks like that fuse is fried and will never work again. It will need to be RMA'd. Call 866-275-6964.

Daniel O

Conditioned Measurements Hardware