Hi, guys;
I sent the HP28 Exploded view ("disassembled" is better) scanned from HP Journal, August 1987, to the three guys who asked for it: Raymond, Marx and Scuba. It's not the way I'd like it to be, but I promise I'll scan it again and try to enhance it. Also, I am trying to get access to my former provider to allow some pictures to be available to download (not this one that does not belong to me). As stated at the HP Journal, its contents may be reproduced since a complete reference for the source is mentioned.
Thank you for being pacient.
Best regards.