Typewriter letter keys are dead; numer keys type, but rapidly and with no correlation to what they should do.

SOURCE: Nakajima AE-830

The typewriter is set in P.S. mode instead of 10 or 12. This switch is in lower left corner of keyboard.

SOURCE: AE-710 Letter Keys Do Not Work

Check the pitch selector switch if it is in PS this will cause this problem.

DickyO

SOURCE: when typing the keys pressed don't match up to the

Check the pitch switch on the L. side of the keyboard it shoul be in 10 or 12, if it is slide it up and down a few times they do get dirty.

Setting margins: When using the mar, rel, key don't hold it down just press and release.

DickyO

SOURCE: typewriter types the wrong letters,

If this is a Nakajima the pitch selector is in PS. If it is a brother the homing pawl is probably broken you need a tech.

DickyO

SOURCE: Typewriter does not type the correct letter. When

On the L. side of the keyboard is the pitch selector slide switch, it should be in 10 or 12 not in PS.
also slide it up and down they do get dirty.

DickyO