Jomar, there are several contacts on the keyboard that mechanically prepare the 5 bit code that will cycle current in sequence with the motion of the motor. Your 9 volt battery connection to the selector magnets needs to be in series with these keyboard contacts at the end of the two wire leads connected to the unit. Pressing a key after turning the motor through several rotations will activate the open closed sequence to the magnets. Note that for a unit that has been sitting for years, those contacts on the keyboard may be quite dirty and need proper gentle cleaning.  Cycle motor thru several times after pressing a key and watch the magnets. This is again a simple test.

Best regards,
John S.

Hi John,

So I put a 9V battery directly onto the magnet leads as you mentioned.  (Its reading was a little less than 9V, so after repeated connect/disconnect sequences the audible magnet clicking diminished.)

The magnet engages, but upon pressing keys, the magnets do not respond.

Would this be a sign of something not completely free in the clockwork?  Manually turning the motor moves the assembly for one keystroke but remains idle after.

Regards,

Jomar

On Mon, Feb 5, 2024 at 11:47 PM John Spigel <[email protected]> wrote:

Jomar, your Model 26 may have the keyboard and selector magnets already wired and ready to go. Make doubly sure everything is freed up and lubed before hitting with 120VAC. Unpowered try connecting a little 9V battery across the two loop leads and listen and see if the magnets activate.  Try typing and see that the magnets respond. If you are confident all is freed up, power the machine, keeping the 9V connected and see if the machine stops free running. If so, try typing and see what happens. This is of course just a basic test. Perhaps with a little joy.

Note that the magnets will need to be in parallel for 60 Ma and that the Break switch will need to be closed to complete the circuit to the magnets.

Best regards, John W1AN

On 06-Feb-24 04:04, Mike McAuley wrote:

Jomar, 

Are you setting this up to be a RTTY station? If so, if you are going to be sourcing a demodulator, why not get one with a built-in loop supply, e.g. a HAL ST-6000. 

Just an idea...

Mike

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