Reset is performed whenever you power off and on. Do you really want to reset the password/PIN code? If so cut and paste this link:
http://www.p4c.philips.com/cgi-bin/dcbint/cpindex.pl?scy=&tmplt=&SearchTxt=DVP%20632&ctn=DVP632/02
and follow through to the questions and answers (there is a big list which should help you).
Ken, December 2004