I have the same problem with the grinding noises. At first I thought it was from the clogged belt that moves the printer carriages because that seems to be were the grinding (like gears meshing together) is coming from; however, I discovered the noise is coming from the upper (lid) of the unit. After removing the lid (lid = upper portion of printer that you lift up to replace the ink) When this was removed there was a loose screw (from the factory) floating around in the lid. After getting the screw out, and with the lid unit dis-assembled, I carefully connected the 3 connections to the back of the printer and started the printer. This "gear grinding noise" is coming from the motor that moves the scanner light assembly back and forth. When the all-in-one does the POST (Power On Self Test) and initializes the scanner the scanner assembly moves into position, but when it (assembly) returns to the "ready" position the motor that moves this assembly won't dis-engage (stop) and this is what makes the grinding (gear meshing sound) like a clicking. |
I don't know if there is a limit switch to turn this motor off, or if it is controlled by an onboard chip. I called the HP help line and the recommended "authorized" service centers, but they have no idea what to do.. actually HP wants me to buy a new printer and they will give me a coupon for this all-in-one. Does anyone have a suggestion to fix this problem of the "grinding gear noise" or knows what shuts off the scanner assembly motor once the POST is completed?