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Message: [QUOTE="RepairTool92, post: 221228, member: 19194"] Hello fellow Printer Techs. Are you ready to change printer history ? I'm working on an HP 4200. Its making a knocking noise. Now I know what you're going to say? Swing plate assembly, but I've already changed that. I've also replaced the fuser , toner, tray 1 assembly , main drive assembly , and lifter tray assembly. I have no idea what this could possibly be. I'm pretty familiar with these machines and can overcome most issues , but this one has got me stumped. [/QUOTE]