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The book says turn the T/W off wait 30 seconds and restart, if condition returns call for service. However you might try removing the batteries and unplugging the machine waiting a few minutes and restarting. CAUTION ALL THE MEMORY WILL BE LOST!
121 says that the keyboard is not supported which means that the K.B. is bad. To get around this hold the code key, press & relase the "L" key type 001 rel the code key this sets the T/W to a US keyboard. You will have to do this until you replace the keyboard or repair it see my tip under WW1000.
? Cartridge..Do you mean ribbon cartridge, print Wheel, or Printer Ass'y. Also check line space LED's for error codes.
Clean the sensor located on the printer ass'y (located behind the print wheel) with air.
Also (power off) make sure the printer ass'y can slide freeley (L-R-L)and no obstructions have fallen into it's path.
There is also a printer home position sensor located on the far left bottom of the printer ass'y travel path. Also clean with air.
Let me know if you have error codes.