How to fix HP OfficeJet 6110 all-in-one multipurpose machine’s stuck scanner
At the Robotics Group‘s lab at the university, we have a multipurpose machine from HP, model "OfficeJet 6100 all-in-one". I was told today it was broken (when starting up made funny sounds from the scanner – couldn’t move the scanning lamp & sensors bar) and that the technician at a computer shop they took it at told them it wasn’t worth fixing (higher cost to send it to service than buying a new one).
They might be right about the cost of shipping to service being high, but I thought I should give it a look myself too. Recently I had fixed an "OfficeJet 5600 all-in-one" machine of my brother’s which was doing crazy sounds too when starting up cause it couldn’t move the print cartridges. That one had been fixed by blowing inside it (with just the mouth) and then placing it upside down and starting it up. The pathway/rail track on which the print cartridges are moving must had gotten some dust or little garbage that was blocking them. Was very glad I fixed it since it was a pity to throw it away – it prints very fast and the prints look very good even at draft setting.
In that older case gravity had helped for the fix, but in this case it was even more amazing how easy it was to fix the machine. At the picture below you can see a small screw at the left side (needs a small Allen key or screwdriver with small star-shaped tip to unscrew it). Have marked it inside a red circle.
After unscrewing that and removing a small plastic cover (holder) and the small rectangular glass it is holding, there’s a spring-locking switch that you have to move upwards (towards the scanner’s lid) and then just start the machine again and it works. Place the small rectangular glass back to its place and screw back its plastic holder and you’re done! Less than one minute fix that is! Easy money 🙂
That switch must have moved by itself after some shaking of the machine probably or wasn’t originally locked correctly at its place. Not sure what it’s for, probably it holds the scanning mechanism in place when constructing the machine in the factory before its final packaging for shipping to customers. No one had moved that switch by hand when we bought that machine, after all the small plastic cover that hides it needs a special screwdriver or Allen key to unscrew it that the average HP customer wouldn’t have handy.
Update: it seems that plastic cover (holder) has a plastic tip that triggers a latch to move the spring-locked switch back to its place when you close the cover. In fact moving that switch only helped for a short period of time and scanner has started to do that same noises again, trying to home the moving light scanning head and failing. Probably there’s some home sensor there (either a touch sensor or a photodiode) that’s stuck or dirty and the scanning head doesn’t detect it reached home and keeps on trying to move where it can’t and keeps on till the machine says the scanner failed (and blocks all other operation of the machine [strange design in my opinion – you’d still want to use the printer even without the scanner working]). So I’ll open up the machine and keep you posted – have to find a star-shaped screwdriver that fits the screw at the right side of the scanner’s glass which seems to be a big bigger than the one at the left side (another strange thing).