Olivetti praxis 30 typewriter. getting power, but keys don't work. Backspace and spacebar work until push letter key, then locks up.

SOURCE: Olympia Mastertype 3 Typewriter

Be sure the pitch selection is correct. If it is set to PS when using a 10,12 or 15 pitch wheel it will select incorrect letters.

SOURCE: The keys will not type the letters they are labeled with.

Do you have the daisy wheel cartridge inserted correctly? The "ear" on the daisy wheel cartridge should always be on the upper right.

If that doesn't fix it .....Try doing a daisy wheel reset by Pressing [CODE] + [RESET]. This will properly index the daisy wheel.

SOURCE: On the IBM selectric 2 - the keys are locked up -

Try the shift key, then try pressing each key on the key board one may be partially tripped.

DickyO

SOURCE: Some keys stop working on keyboard

The particular keyboardpart must have gone. I had his problem with my Dell some years back. I removed the entire laptop, removed and reinstalled teh keyboard wire to the motherboard..and the problem did not arise. Happens whenever over heating occurs.

SOURCE: IBM Selectric II typewriter stuck in correcting position

If you know how to remove the right dust cover (black inside the T/W below the carrier) next to the R. side frame is the correction set up mech. spray some WD40 on the arms especially where they pivot, they should free up.

DickyO