HP 4600 Service Manual - Page 191

All components in the HP Color LaserJet 4600 Series printer use Phillips-head screws that require a #2 Phillips screwdriver. Make sure that you have a Phillips screwdriver and not a posidriv screwdriver. Figure 6-1 Phillips and posidrive screwdriver comparison shows the difference between a Phillips and a posidriv screwdriver. The surfaces on a Phillips tip are more beveled surfaces. Figure 6-1 Phillips and posidrive screwdriver comparison Types of fasteners Table 6-1 Types of fasteners describes the screws used in the printer and provides guidelines to help determine where to use each type of screw. The screws vary in length depending on the thickness of the material being fastened. Always note where each type of screw is located and replace each one into its original location. Table 6-1 Types of fasteners Illustration Description Screw, machine with washer Uses To hold plastic to metal. M3x8 part number xA9-1276-000CN Screw, self tapping Screw, truss head For example: printer covers To hold plastic to plastic. For example: printer cover to a plastic hinge To hold sheet metal to sheet metal. M3x6 part number xA9-1275-000CN Retaining ring (e-type) For example: formatter cage To hold a shaft through a slot. For example: keep a gear on a shaft ENWW Introduction 175