STB #23 – Rebuilding a TRS-80 Model I keyboard

This was a fairly large undertaking and took a couple of days to complete.

In the video we completely tear down the keyboard to the bare PCB leaving only the TTL ICs and Resistor Network still on the board. All key switches are desoldered from the PCB and removed from the metal frame. The frame is painted, the switches are tested and sorted into ‘Bad’, ‘Questionable’ and ‘Good’. I then reassemble the keyboard in steps so I can test each group of keys on the Model I, deal with a few bad key switches that made it through testing and finally complete the rebuild. There are 4 video in the series.

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