I recently acquired this tape and thought this forum might be interested in taking a look at it, it's an old third party repair/maintenance tape put out for the NES back in 1992. Subjects range from simple contact cleaning to power regular cap replacement.
http://www.youtube.com/view_play_list?p ... 03E8E9C7E7
http://www.youtube.com/view_play_list?p ... 03E8E9C7E7