My GX-6750 How do I get my Daisy wheel installed correctly so that when I strike the J key, it prints a J (and not some other letter....)?

The Font or letter size is depends to your printing fonts or daisy wheel. Buy a different Font size of daisy wheel or printing wheel.

first try turn typewriter off, (button on left panel toward the back), then turn it back on, and while hold down the CODE button, press RESET key, the whole print head will move and reset

if that doesn't work, power off again, open the cover, release the lever to the Daisy Wheel, and inspect that Daisy Wheel - mine has a bent forward letter, and another letter was kinda stuck to the side of another letter... I gently fix both letters, put the Daisy Wheel back in, firmly lock it in place with the lever, close the cover... and voila, it works like a charm.

While you have it open you might want to dust (use the cleaning spray can duster)... You wouldn't believe what I found in my typewriter... Good luck!

If that doesn't work, I would replace the Daisy Wheel.
gkt

Check to see if the unit is not on the demonstration mode. Also, does this unit have language change feature? if so, maybe it is set for another language and you cannot of course recognize what is is printing. Or , has any liquied or hi level of moisture gotten to the unit o r the keyboard? The moisture will effect everyhting and make it iratic until thoroughly dry. Goodluck, Macgivor

look for bent or broken spokes on daisy wheel .turning unit off for 20 seconds and back on should reset the daisy wheel home position. probably the daisy wheel.

change Cassette daisy wheel. with the letter

have you tried chaging the daisy wheel with a known good one? If yes, have you checked to see if the hammer is in a good condition?

I downloaded the manual from http://www.devicemanuals.com/downloadguide.php and then, following the instructions there, I removed then re-inserted the daisy wheel. This solved my problem. Perhaps it had somehow gotten out of adjustment. At least, it is something to try if you haven't tried it already.

Install wheel, turn machine on and off this resets the printer and home timing. If it still does not correctly, adjustments needed..

Turn oFF the typewriter, take the ribbon out.....use the lever on top to release and remove the print wheel cartridge. Lightly rotate it to see if it will move and reinsert the cartridge. snap it back into place.
Turn on the machine, the typewriter should move the carrier to the left and reset the printwheel....if it is snapped back properly.

Your T/W neads a new keyboard membrane, you cannot clean this type membrane so you will have to replace it.