Panasonic UF-490 Service Manual page 71

4.3.2. Information Codes: 401, 402, 422
START
Is the ID Number programmed
into your machine?
Is the Receiving unit set up for
Selective Receive?
401
No
Yes
Yes
No
END
402, 422
START
Is communication with the
reference unit successful?
Yes
Check the remote unit in
question.
(Remote unit is defective)
END
Program the ID Number.
Check the Selective Receive
settings at the receiving unit.
71
No
Replace the SC PCB.