Schematics for HP38E

[Geoff Quickfall]

Hello Jack!

Failure modes on the Spice series:

• New battery design is larger then design used in calculator resulting in broken battery contact tabs.
• Battery corrosion affecting battery compartment.
• Corrosion affecting power flex ribbon.
• Compression of foam compression substrate causing loose IC connections
• Oxidation of foam compression substrate traces.
• Various case cracks from bad attempts to separate shell or dropping. Weak plastics.
• Display issues, especially on the floating IC version,
  

As far as wiring diagrams of the power supply, i direct you to this site, (Kees VanderSanden's excellent HP site) scroll down to find the spice series power supply schematic:

Power supply diagrams

Various articles for opening the shell and spice restorations.

Links at bottom of page

Cheers, Geoff





This is not directed at anyone in particular but web searches (google etc) are your friend.