HP 32SII success and woes

[rprosperi]

(02-13-2015 12:17 PM)Sanjeev Visvanatha Wrote:  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

That final link appears to be bad, it takes me to some sales page on HP's website. I think the ellipsis screws it up.