Vintage Casio S-1 Desktop Calculator

This Casio S-1 caculator is yellow with age, but is still operating well with good key pad.

A design error in the support for the battery terminals can

cause the thin plastic wall of the terminal to give way

due to pressure from the inserted batteries. When this happens

the battery loses contact and the calculator malfunction. A simple repair

is to place a strip of nylon tubing to reinforce the battery terminal wall.

 

The moulded model number on the case is  S-2 but this

is covered over with a label showing the calculator as a S-1.