[GreenKeys] Two interesting documents

[Jim Haynes]

just came my way, a couple of Associated Press bulletins on Model 15
maintenance.  I have scanned them and they are available by email if
you can handle 8 megabyte mails, otherwise will have to work out some
other way.

One is a good general field maintenance manual for the M15 typing
unit.  It assumes that the machine was new or rebuilt in the shop,
so the maintenance is limited to what might need to be done in the
field.  I can see by the diagrams that A.P. was using a solid state
selector magnet driver, apparently built for them by Multiplex
Communications of W. Babylon, N.Y.  There is no schematic of the
driver circuit.  This publication was issued in 1970, perhaps the
latest date for anything having to do with maintaining Model 15s.

The other is a pictorial manual for changing gears in the Model 15.
Apparently they changed from 60 wpm to 75 wpm on a certain date, so
expected the customers to do the gear change.  Says they would need
more than 3000 technicians if they had to make the gear changes.
It says the date for the change will be announced later - does anyone
know what it turned out to be?  One step they left out is that of
checking for slight play between the motor pinion and the driven gear.
I guess they thought that was too much for the customer to undertake,
and hoped that most of the machines would have sufficient play.