[GreenKeys] M28 printer FIGS-LTRS shift puzzlement

[Nick England]

I am trying to resurrect a long-neglected M28 printer that just doesn't
quite want to go into LTRS. It looks like the LTRS function slide is
pulling back OK, but the fork isn't moving quite far enough to the right
for the LTRS-FIGS shift code bar to click into place.
If I nudge the fork just a little, the shift code bar will click to the
right. If I pull the LTRS function slide back a little farther, the shift
code bar will click to the right,

As best as I can tell, the LTRS-FIGS shift slide and the two breaker slide
bails are behaving, the fork just can't quite get them far enough to the
right.

Going to FIGS is no problem, just getting over the hump into LTRS.

I have tried adjusting the guide plate but with no luck.If I send repeated
LTRS I can see the fork trying to move the shift code bar pin but never
quite enough.

I feel like I am missing something here - actually I don't understand the
mechanism that makes the LTRS-FIGS shift code bar click into place left or
right (but I see that it does on a working typing unit so I guess that is
normal behavior).

Is it possible that my LTRS function slide has just worn down and it can't
move the fork enough?

Of course this is one of those stunt boxes with a zillion switches and a
cable as thick as your wrist so I am really trying to avoid pulling it out
to disassemble the shift fork mechanism.

Any advice greatly appreciated.

Nick England K4NYW
www.navy-radio.com
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