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When I received this Friden 1217 it was operational for a short while, but soon started to block during calculations.  After quite an extensive search I discovered a loose slotted screw inside the the machine at a point which couldn’t  possibly be reached with a screw driver.

However, using a small screwdriver as a chisel, sticking it in the slot I managed to fasten the screw.  Beforehand I cleaned the screw and its surroundings and put some glue on it. Until today it holds.

This machine runs at two speeds, one for control actions and a higher speed for addition and subtraction in calculations.  Photo’s A show the two switches.

The cover of the machine can be very easily removed by loosing two screw a single turn and then loosen two clips which hold the cover.

(See photo’s B)

Ink ribbons are not widely available.  I found a Dutch supplier who delivers worldwide and has a very wide collection of ribbons and other calculator and typewriter related supplies.  See Links.

Spark suppression:

Many, perhaps most machines suffer from leaking or removed capacitors.  In this machine they were partly removed. From what was left I wasn’t sure how the circuit originally was built.  I rebuilt it in order to obtain a proper spark suppression, but guess that originally less components were used.

B: Case mounting clip

Result register with carry mechanism

A: The speed regulator contains two switches which open at different speeds