Repairing an HP3421A (Signature Analysis)

Rik Bos 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.

-Rik

> -----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?
> 
> Thanks
> 
> **vp
> 
> 
> 



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