Hi all, just wanted to add my experience with this issue.
In my case the ITB was moving (the black was window rotating properly) and the gear was rotating upon visual inspection and the optical sensor was working fine. However shortly after powering on the printer a "whirring" sound would be heard and the 59.F0 error would popup and the printer would be offline. Also when running the ITB diagnostic a this whirring noise would also be heard sometimes which was never heard before.
Following Bernielhat's suggestions, I resolved the problem removing and cleaning the degraded foam "click silencer" from the solenoid actuator lever. In our case the gear was not misaligned and nothing was broken and the solenoid was working fine, it was just sticking so that the gear did not stop when it should have as the actuator would not "drop" in time and a "whirring" o fast clicking noise (like slipping gears) was heard from the side. This is because the large "double gear" has a small dent/camme where the solenoid actuator should lock on to stop it from rotating but being held back by the sticky foam it would drop after half a second missing the stop point. The gear would then rotate too far as it is spring loaded and hit the relevent primary gear. When the primary gear rotated it's gears would "slip" on the spring loaded gear and create the whirring or clicking noise which I heard as out of alignment. This subsequently misaligned the ITB black "window" which rotates on the ITB and the relevant sensor would not detect the correct position resulting in the 59.F0 error. For additional reference I will attach some photos of the solenoid and gear assembly.
Attachment 31364Attachment 31365Attachment 31366
The solenoid can be dismantled easily (the photos show the solenoid without the actuator which I already removed): after unscrewing the 2 screws from the solenoid assembly, remove the solenoid from the gear assembly lifting and rotating it out. Then carefully remove the actuator spring and lift off the metal actuator by slightly tilting it to one side and lifting it off, it's easier said than done. Clean off the black adhesive pad using some alcohol or solvent. I used first my finger then some alcohol and my nails to remove the remaining adhesive. Remount it the opposite way, first the actuator then the spring and place it back in the gear subassembly taking care of lifting the metal actuator with a small screwdriver while inserting it back into position as it will get in contact with the gear if not pressed back. Hold it there and put the 2 screws back into place.
Attachment 31367
The "clicking" is barely noticeable once the printer is closed up and running so I don't really know why hp decided to place that pad there. It took me 4 hours to get the thing apart and back together as there is no other way to access the solenoid. The contact surface is large so it won't consume or dent the actuator in any way.
Kudos for the sticky/foamy pad on the actuator which saved me debug time and money!
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