[GreenKeys] BASE 15C

[hwhall@aol.com]

Hi,

Bases would not have selector magnets on them. They're part of the typing unit that separates from the base with three large knurled thumbscrews. Perhaps when you say "base" you meant the base + the typing unit? And by "printing units" you meant what we call the type basket? (The basket requires you to disconnect the return spring strap and roll it off the typing unit's rails.)

Actual Base Units; that is the "foundation" onto which the Typing Unit sits (attached by said knurled screws) & into which the Keyboard plugs, & which carries the Motor, are probably little different & you should work with the one that's in best condition or least molested.

"There is also a 4 terminal socket arrangement adjacent to the fuse, nothing connected."
That sounds like you're looking at the fitting for a polar relay unit. Most of us don't bother with those, as they were intended to help interface the machine with really long loops (like, miles of wire).


--Wayne
  WB4OGM

On Tuesday, September 23, 2025 at 11:02:52 PM MDT, Peter Leonard <peter at lencom.com.au> wrote: 

Hi,

I have a number of various Model 15 components. 2 Bases, 2 Printing units, 2 keyboards, 1Tape distributor, 1 case and 2 keyboards for tape punching.

All are far from perfect but appear complete. I do have access to a large range of NOS spares.

My task is to refurbish and produce a complete working system.

At present I am trying to decide which base unit to start with and I have noticed considerable variations between the two. 

The unit in worst condition is marked 15C and is fitted with a terminal strip marked 21-46 and is equipped with the holding type magnets. 

The better unit (marked BB-44 on a brass plate) has three terminal strips with six terminals each and is fitted with a line relay and circular (puller) magnets. There is also a 4 terminal socket arrangement adjacent to the fuse, nothing connected.

I have a schematic of the standard 15C base but cannot find a schematic of the other. Is anyone able to point me in the right direction?

Thanks

Kind regards,

Pete

73 VK5XP
 
 Peter Leonard