[GreenKeys] M15 Restoration -- Type Bar Basket

[Jim Cooper]

On 3 Feb 2021 at 14:30, Paul Birkel wrote:

> The PULL BAR BAIL behavior, what
> appears to be double-advance per
> key-press, and the lack of ever
> triggering any type bar, seem to me
> to be the key anomalous behaviors. 

I would say you are on the right track. 
The pull bar bail should engage the selected 
type bar and throw it against the platen. 
  
> I can imagine that there may be a
> timing problem (or perhaps related
> lubrication problem affecting vane
> control) resulting in erratic
> behavior on a per-key basis (even the
> space is erratic, sometimes causing
> a CAR RET), but I'd like to first get
> "basic operations" functional before
> probing further. 

it sounds like your errors are caused by 
the vanes not being selected properly. 

First suggestion I have is turn the motor OFF. 
Have the kbd and sel. mags in the look. 
Press a key such as R; 
Slowly rotate the motor (using the fan) in the 
  proper direction; 
the kbd should generate the proper bits as the 
motor turns; 
the sel. mag. will respond to the mark or space 
from the kbd as you turn the motor slowly; 
after the 5 bits and the stop bit, the vanes 
  should be properly selected for the R 
  (I suggest R because, like the RY test, it is 
  the code where each vane is opposite to the 
  adjacent ones). 
if you don't type anotheer character on the kbd, 
  then continuing to rotate the motor should cause 
  the printing functions to follow through... 
if the vanes are properly set, the watch the print 
  bail and see if it catches the R typebar; 
whatever does not work in that sequence is where 
  you need to focus attention first ! 

do the vanes flip back and forth easily ?
did the selector magnet pull and release properly 
  for each code bit?

w2jc