HP 32SII success and woes
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02-13-2015, 12:17 PM
(This post was last modified: 02-13-2015 01:00 PM by Sanjeev Visvanatha.)
Post: #22
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RE: HP 32SII success and woes
Regarding the 'metal plate' I was mentioning earlier. It seems that with the introduction of the 32SII in 1991, HP went to a PCB design with ground shield mesh on the back, eliminating the need for metal shielding on the back of the calculator case.
http://www.hpmuseum.org/guest/brogpion.htm Quote:With the HP-32SII and newer low-end models, HP has greatly simplified the PCBs' layouts. The new PCBs have traces on only the front side, with a ground shield mesh on the back. (This has eliminated the need for metal shielding in the back of the calculator.) So, I surmise that the metal plate I was referring to is the shielding on the inside of the case found pre-1991 on all models and post-1991 on everything but the 32SII and low end models. This seems to be supported by Fig. 23 of Geoff's article, where the metal shielding covers the exact spot I was referring to in my previous posts: http://h20331.www2.hp.com/hpsub/download...e_2010.pdf (Click on Calculator Restorations when the PDF opens up) -- Sanjeev Visvanatha |
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