I have a colour laser jet 5 here and the best I got it work in cups was using the postscript driver, as is,
The laser should be able to understand postscript and change from PCL if thats what you have.
Give it a try as I found none of the hp drivers worked in cups.

On Thu, 2004-12-30 at 10:20 +0000, Sujith kumar wrote:
HP Laserjet 1010