Error code 634 panasonic dp 190 - Panasonic Workio DP-190 Multifunction Laser Printer

Is that a fax error code?
well here is the description for error 634:

Redial count over with no
response, or busy tone was not
detected.
Note:
U.S.A., and Canadian models
will redial only once if a busy
tone is not detected.

this happens when you send fax on an autofax destination.
you may also check your setting for your redial count
that's it :)