Repairing an HP3421A (Signature Analysis)
hp-fix at xs4all.nl
Thu Jun 4 15:11:37 CDT 2009
In the HP Journal issue of May 1977
http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/hpjindex.html there is an
article about signature analysis.
Otherwise the service manual of the HP 5004
http://www.gamearchive.com/General/Data_Sheets/HP5004.pdf or 5006 should
help you further.
The signature check is related to the CRC check.
> -----Oorspronkelijk bericht-----
> Van: cctalk-bounces at classiccmp.org
> [mailto:cctalk-bounces at classiccmp.org] Namens vp
> Verzonden: donderdag 4 juni 2009 21:16
> Aan: cctalk at classiccmp.org
> Onderwerp: Repairing an HP3421A (Signature Analysis)
> I am trying to repair an HP3421A data acquisition and control
> unit that fails its power on tests.
> In the service manual it refers to a number of "Signature Analysis"
> tests that essentially mean that the unit runs some
> diagnostic routine and you go and collect "signatures" from
> various test points.
> Unfortunately I do not have a device to compute these signatures.
> Does anybody know how to calculate them using a logic
> analyzer (I have a Bitscope and an HP 1630D), or something similar?
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