HP Pioneer series calculator internals
Takayuki HOSODA
Nov. 17. 2009

Japanese Japanese edition is here.
PCB of the HP pioneer series calculators

 Left: HP-17BII, Center: HP-27S, Right: HP-42S(改造済)

Membrane switches

Key pad and back plate (with LCD)

Partial schematic of the HP 17BII/27S/42S
SEE ALSO
HP 42S memory upgrade and overclock
Pioneer "Observational Internals", Paul J. Brogger
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