[GreenKeys] Printer won't align model 15

[Harold Hallikainen]

The fact that the printer prints correctly when keyed by the keyboard
indicates to me that the printer is working, and the loop supply is
working (one concern was trying to use a low voltage loop supply, but the
keyboard working indicates the loop current can increase fast enough). I
wonder if the issue is just the speed. Is it possible for you to look at
the loop current on a scope? When you press a key with alternating mark
and space (such as R or Y), can you see that the data bits are 22 ms long?
MAYBE the printer has gearing for another speed. I think someone else
asked about whether the motor was governed or synchronous. A 60 Hz
synchronous motor will run at the correct RPM if powered by 60 Hz. A
governed motor can be adjusted all over the place.

Good luck!

Harold
https://w6iwi.org


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