So this is main culprit because on initialize of cartridge location cradle sensor is not passing signal to logic board about location of cradle hence for detecting the location cradle bangs left and right corner on the rail. On removing the encoder strip I found that right side locking notch of the strip already worn out. So I have removed the plastic strip that is Encoder Strip which decides where to stop the Cartridge while printing by sensing the location with help of sensor which is located behind cradle of the Cartridge. On visualize inside with a torch light I found one plastic strip was hanging in between the path way of cradle. Once powered ON I found Cartridge cradle was banging left and right side end of the mechanism. Hence to fulfill my curiosity I have opened the front cover from where we install the Cartridges. When I connected the printer to my power outlet it started the bang noise periodically. Normal working procedure is when you power on the Printer cartridges initialize with maintaining air pressure and keep your printer ready for Command to print. But Bang noise is something different. It was not a squeaking, high pitch, clicking or grinding noise. Problem Symptom: Printer making a loud bang noise when powering up. Customer walk-in to my workshop with HP all in one DeskJet printer Model: K209a.
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