it says the error is

T4
is an ink overflow condition. You may need to check andclean out ink section of drum. Remove the ink then press reset button. Thenturn off and on and re-insert ink.

but how to i clean it? can i take some water to wash it out, is there any problem if i take water.the ink thus not caming out by its self.

after this error came by the red ink, it is a problem when i put any other drum in. i get only 2 sheet printed and then it stops printing.

when i get in test mode, how to i insert the numbers i need for testing the riso, on the rc 4500 i cant find out how to get the code in!

thanks for your help!