baudotrss

yping unit lifts out. Again, a switch closes so this doesn't break the current loop and interfere with other machines on the loop. Replacing the motor takes a screwdriver and about two minutes. That's everything except the cast iron base and some switches and wiring. So a quick swap in the field will get you going if you have the spares. It was routine to swap these big units and take them back to a shop for cleaning and oiling once a year or so. At the next level of maintenance, there are removable subassemblies. The carriage and the selector assembly, the most complicated subunits, come off easily with tools. So they can be swapped by first-line maintenance if necessary. Finally, every part can be unscrewed and replaced if necessary. That's why these machines still work. They are totally maintainable. However, they require considerable adjustment after maintenance. Measuring spring tensions and clearances is required, not just parts changing. Fortunately, the very detailed manuals have survived.[4] The price of this maintainability was the need for too much infrastructure. Maintenance depots. Teletype mechanic schools. The military had two levels of school - one to do installation and maintenance down to sub-assembly replacement, and one for the shop techs who had to be able to totally disassemble and reassemble a machine. All specialized for one or two very specific machines. That's expensive. [1] https://vimeo.com/124065314 [2] https://github.com/John-Nagle/ttyloopdriver [3] https://github.com/John-Nagle/baudotrss [4] http://www.aetherltd.com/manuals.html