typewriter worth trying - after switching on, typing comes out normal - but half way along the platen, wierd characters appear - not what I typed - this continues - the only way to go back to normal is to switch off, and start again - but then half way along, the printwheel is obviously haywire - with a slight buzzing noise - no sign of damage to any of the parts - the machine has NOT been dropped etc. Is it kaputt or is there a small repairable fault, please. Thankyou.