Removal and replacement strategies This chapter documents removal and replacement of field replaceable units (FRUs) only. Replace parts in the reverse order of their removal. If replacement requires difficult or critical installation procedures, notes are provided with detailed special instructions. WARNING! To avoid serious injury, unplug the power cord from the power outlet before servicing the printer. Certain functional checks must be performed during troubleshooting with power 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 attached to the formatter's radio frequency interference (RFI) shield contains nickel. Do not touch the clip gasket with bare hands. Repair technicians should wear gloves to handle this gasket. Be advised in accordance with European Union Directive 76/769/EEC that ingestion of water- soluble nickel salts can cause nausea, vomiting, and diarrhea. The printer might have sharp sheet metal edges. Exercise caution when 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, then carefully turn clockwise to tighten. Do not overtighten. If a self-tapping screw-hole becomes stripped, repair the screw-hole or replace the affected assembly. Always remove the toner cartridge before removing or replacing assemblies and parts. Note Note the lengths, diameters, and locations of 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 replacing wire harnesses, always use provided wire loops, lance points, or wire-harness guides. Required tools The following tools are required used to remove and replace assemblies detailed in this chapter: Phillips #2 screwdriver with magnetic tip Small flatblade screwdriver Needle-nose pliers ESD mat C7058-90936 Removal and replacement strategies 95