HP-41CV half-nut version scientific calculator
Great working condition.
Later half hut version (single SoC on the main PCB).
Mint battery contacts.
This machine never experienced battery corrosion.
The usual problem with HP Card Readers.
Gummy wheel leave marks over the magnetic cards and it will need to be repaired.
HP-41CV HalfNut Tear down.
Removing the four rubber feet to undo four screws.
Interior in original condition. Never opened before.
The 5061-7255 Hybrid Memory/Display Driver from 1895 week 50.
The 1LM2-002 SoC from 1985 week 39.
82104A Card Reader repair
The usual problem with HP Card Readers: Gummy drive wheel
Drive wheel was cleaned and ready to receive the new rubber rings.
Machine was reset.
A program stored on a magnetic card was read successfully.
And the previous memory contents was restored.