After many years of service I have trouble with a DesignJet 5000. It may help others (myself included) to describe some stuff here.

• Model: C6090A (and probably other DesignJet 5k types like C6090AR, C6090V, C6091A, C6091AR, C6091V too)

• Error: "switch power off check printhead path(2)"
• Solution: Replace belt
• Why? Because people at the HP fora suggest it and there are lots of rubber particles in the printer.

Ordering parts

071024 Google on HP partserver and you'll never find it (HP, wake up). So go directly to http://partsurfer.hp.com/ . Now somehow HP sites are often slow and after plenty of time outs it's tempting to Google on part http://www.google.com/search?q=Q1251-60320 and buy it somewhere else. HP really screwed me with four standard hard drives for two DesignJets in two years but in this case trying to buy directly from HP results in a reasonable price which is a good thing for the perception of HP on consumer level.

Delivery

Wow, delivery two days later, great!

Hands on

071027 Weekend is a nice time to do the replacement. disassembling is hard without pictures so I learned to go the right model at the part server site (in this case http://partsurfer.hp.com/cgi-bin/spi/main?sel_flg=modinfo&HP_model=C6090A) and choose "View a parts diagram:" in order to remove left and right covers, etc..