Einleitung
The Seiko Oxford Crossword solver model ER3500 had some keys on the qwerty keyboard that often did not work. These were the most common keys (including the on/off) making it almost impossible to use.
The back of the device was opened to reveal the back on the key pads. These pads contain a black conductor (see image) and when pressed onto the circuit board complete a circuit to register that the key has been pressed. However on the frequently used keys, the black coating was no longer conductive.
To make the keys conductive again, some aluminium foil was glued onto them (see image) and the device worked again.
The device was still working two years after the repair.
Pasting conductive aluminium foil on the back of these key pads got the battery operated crossword solver working again for near zero cost.
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