HP 8550GN Drum Reset???

[Wurzel.D]

:confused: Hi there, recently one of the companies i work for has purchased a second hand but pretty much brand new HP 8550GN. However the previous owner changed the drum kit without resetting the printers drum value back to 100%. How do i do this? I asked HP and all i got from them was "buy a new drum kit and follow the instructions." I already have a new drum so im not doing that! Its only the reset drum instructions that im lacking so if anyone can help it would be mutch appreciated! Thanx!
Patrick.

[MichaelTech]

Hold down the Left side of the Item and Value keys at power-up.

The service mode menu lets you re-set any values you need to.

Leave the total page counts alone.

[Wurzel.D]

Your a life saver! :D

[Wurzel.D]

Unfortunatly there seem to be resets for everything but the drum in the service menu. The only thing drum related that i can see is the drum motor test. What am i doing wrong? Anybody know??? :confused:

[MichaelTech]

Howdy, sorry for not getting back sooner, It may be the density sensor that is causing this, try reseting the "Transfer count", and clean the density sensor in the door.

[Wurzel.D]

The cheeky monkeys had swaped the chip inside the drum for an old one. Chip changed, problem solved! :cool: