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HP 53131A Non-USA Serial Number Cross Reference

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David D:
I just purchased an HP 53131A counter that was made in the Korean HP facility. I'm looking for the correct manuals for it online, but everything I have found references the USA serial numbers. The prefix on mine is KR9120. How do I determine what year/build of a Korean built unit?

alm:

--- Quote from: David D on May 23, 2023, 06:10:29 pm ---I just purchased an HP 53131A counter that was made in the Korean HP facility. I'm looking for the correct manuals for it online, but everything I have found references the USA serial numbers. The prefix on mine is KR9120. How do I determine what year/build of a Korean built unit?

--- End quote ---
If the manuals reference PCB revisions, then check the markings on the PCBs. Otherwise semiconductor date codes should give you a hint of when it was manufactured. As far as I'm aware, different production regions use independent serial number sequences, so unless someone compiled a list of serial numbers for this particular units, or you find a manual for your Korean serial number, I think you'll have to do your own research. You could also look at the backdating section. For example the assembly level repair manual says that for serial number ranges 3705A-3710A to 3711 the motherboard was updated from 53132-60001 to 53132-60014. So if you find motherboard -60001, you're unit will likely correspond to US serial ranges 3705A-3710A.

luis garcia:
David, where are you looking for the manuals?

David D:

--- Quote from: alm on May 23, 2023, 07:09:13 pm ---If the manuals reference PCB revisions, then check the markings on the PCBs. Otherwise semiconductor date codes should give you a hint of when it was manufactured. As far as I'm aware, different production regions use independent serial number sequences, so unless someone compiled a list of serial numbers for this particular units, or you find a manual for your Korean serial number, I think you'll have to do your own research. You could also look at the backdating section. For example the assembly level repair manual says that for serial number ranges 3705A-3710A to 3711 the motherboard was updated from 53132-60001 to 53132-60014. So if you find motherboard -60001, you're unit will likely correspond to US serial ranges 3705A-3710A.

--- End quote ---

Good idea! Thank you for that!



--- Quote from: luis garcia on May 23, 2023, 08:06:22 pm ---David, where are you looking for the manuals?

--- End quote ---

I've looked at several sites, including Keysight/Agilent.

David D:
Opened it up and it's got a 53131-68004 motherboard. The motherboard actually says "Made in USA of Domestic and Foreign components. Since this says "Made in Korea" and has a Korean s/n, I guess it was just assembled in Korea, or some replaced the motherboard at some point? The firmware rev is 3703.

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