The HP LaserJet 9000 was a flagship printer for use in high volume applications.  It featured a high print speed, which was very popular.  The 9000 was, however, had several issues that should be expected of any printer without a proper predecessor.  The LaserJet 9040 and 9050 are HP’s followups to the LaserJet 9000, the latter of which will be discussed in more detail here.