[GreenKeys] 28ASR "T" mode problem

[Nick England]

In "T" mode, the keyboard signal generator clutch is not supposed to
engage, meaning that the keyboard mechanically activates the perf but does
NOT transmit a signal on the line. This allows you to cut a reply tape
without interference while the page printer is printing an incoming message.

My problem is that the perf is getting activated/reset fine in T mode, but
unfortunately the keyboard signal generator clutch is also getting tripped,
causing the keyboard signal generator to interrupt the signal line. This
means I can cut a tape OK, but that printing of an incoming message gets
garbled.

I can't figure out how to adjust  the keyboard control selection lever so
it does not trip that clutch. The control cam is causing the perf to
activate/punch/reset correctly in T mode, and I can see that the keyboard
control selection lever is rotated, but that dang clutch trip lever is
still tripping.

 Note - I can't actually see the end of the clutch trip lever as it is
buried in there somewhere.
 - reference position C on Figure 21 of 573-117-100 - (diagram attached)

Any suggestions? I swear this thing used to work properly but something has
happened and I can't figure out what.....
Nick

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