HP 2300d Service Manual - Page 113

Removal and replacement strategies WARNING! This chapter documents the removal and replacement of the field-replaceable units (FRUs) only. Replace the parts in the reverse order of their removal. If replacement requires difficult or critical installation procedures, the notes that are provided give detailed special instructions. To avoid serious injury, unplug the power cable from the power outlet before servicing the printer. During troubleshooting, certain functional checks must be performed while power is supplied to the product. However, the power supply should be disconnected during disassembly. Never operate or service the printer with the protective cover removed from the laser/scanner assembly. The reflected beam, although invisible, can damage eyes. The clip gasket that is attached to the formatter's radio frequency interference (RFI) shield contains nickel. Do not touch the clip gasket with your bare hands. Repair technicians should wear gloves to handle this gasket. Be advised in accordance with European Union Directive 76/769/EEC that ingesting water-soluble nickel salts can cause nausea, vomiting, and diarrhea. The printer might have sharp sheet metal edges. Be careful to avoid these edges when you are working on the printer. CAUTION The printer contains parts that are sensitive to electrostatic discharge (ESD). Always service the printer at an ESD-protected workstation or use an ESD mat. To install a self-tapping screw, first turn it counterclockwise to align it with the existing thread pattern, and then carefully turn it clockwise to tighten it. Do not overtighten. If a self-tapping screwhole becomes stripped, repair the screw-hole or replace the affected assembly. Always remove the print cartridge before removing or replacing the assemblies and parts. Note Note the lengths, diameters, and locations of the screws. Be sure to use them in their original locations during reassembly. Note Incorrectly routed or loose wire harnesses can interfere with other internal components and become damaged or broken. Frayed or pinched harness wires can be difficult to find. When you replace wire harnesses, always use the provided wire loops and wire-harness guides. Required tools The following tools are required used to remove and replace the assemblies that are described in this chapter: q Phillips #2 screwdriver with magnetic tip q small flatblade screwdriver q needle-nose pliers q ESD mat ENWW Chapter 6 Removal and replacement 111