On 23 Apr 2023 at 17:36, Eric Moore wrote:

> Because the stop pawl is not being caught, the FPR runs open.

When problems are encountered with the selector magnet
not causing code bars to select, one can manually test the
sequence of opeations by turning off the motor, disconnect
the local loop, and turn the motor IN THE PROPER
DIRECTION by hand ...  hold the selector magnet IN by
hand as you rotate the motor.  As you turn the motor, the
main shaft should come to rest and no action in the selector
swords, bars, etc. should be happening.

As you turn the motor, release the selector magnet and the
main shaft should begin to turn ...  press the sel. magnet
armature back in and the main shaft should complete one
revolution and 'disengage' again. 

To debug code selection, if you have a keyboard on the FPR
you can then connect the local loop with the kbd and the
selector magnet in series.  Turn the motor by hand and
press a key on the keyboard.  Because everything is run off
the motor, the kbd contacts and code bar selections will
be 'synchronized' as you turn the motor by hand.  So press
the R key on the keyboard as you rotate the motor by hand.

The kbd will begin to open and close its contacts, thus
opening and closing the local loop which will in turn release
and pull in the selector magnet, which will then cause the
selector swords to operate the code bars -- all in "slow
motion" as you watch the mechanical movements.  If
something is jammer or sluggish, you will probably be able to
SEE what is not working properly.

Repeat by pressing Y to shift all the code bars to the
opposition positions.

w2jc

btw, my impression of  all that extra 'stuff' with the
magnets and gear was for some sort of tape feedout...
nothing to base that impression on except suspicion!

I thought you might have fun figuring out the tangled
mess of cables and connector and gears.   ;))