http://www.fixya.com/support/t25913869-riso_cz_100_error_p12_305
Sounds like part replacement will be necessary, by a professional technician, rather than a "do it yourself" fix.
http://www.copytechnet.com/forums/digital-duplicators/91846-riso-cz-100-a.html
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Quoting from the link above a copytechnet: "
Originally Posted by raztech
So...the code error p12-305 apears when i push the print button ..nothing move and the code go on...
Answer:
Master compression HP sensor does not go ON within 1 second after the master compression motor operates in the return direction"
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