HP 2420 Service Manual - Page 92

Introduction This chapter documents removal and replacement of field replaceable units (FRUs) only. WARNING! NOTE Removal and replacement strategy Replace parts in the reverse order of their removal. Directions for difficult or critical replacement procedures are included. The sheet-metal edges of the product can be sharp. Use caution when working on the product. Note the length, diameter, color, type, and location of each screw. Be sure to return each screw to its original location during reassembly. Incorrectly routed or loose cables can interfere with other internal components and can become damaged or broken. Frayed or pinched cables can be difficult to locate. When reconnecting the cables, always use the provided wire loops, lance points, or cable guides. CAUTION Electrostatic discharge The product contains parts that are sensitive to electrostatic discharge (ESD). Always service the product at an ESD-protected workstation, or use an ESD mat. Watch for the ESD symbol (shown at left) to identify the parts that are sensitive to ESD. Protect these parts by using an ESD wrist strap and by placing ESD-sensitive parts into protective ESD pouches. CAUTION User-replaceable parts To remove and replace the pickup roller or separation pad, see Separation pad. Required tools The following tools are needed to service this product: ● #2 Phillips screwdriver with magnetic tip ● Small flatblade screwdriver ● Small needle-nose pliers ● ESD mat ● Penlight A pozidriv screwdriver will damage screw heads on the product. Use a #2 Phillips screwdriver. If you use a multispeed screwdriver, use a torque limiter. 78 Chapter 6 Removal and replacement ENWW