HP 2100 Service Manual - Page 162

Removal and Replacement Strategy This chapter documents removal and replacement of field replaceable units (FRUs) only. Replacement is generally the reverse of removal. Occasionally, notes are included to provide direction for difficult or critical replacement procedures. 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 which is attached to the Formatter's RFI Shield contains nickel. Repair technicians handling this gasket directly should wear gloves. Be advised per European Union Directive 76/769/EEC that ingestion of water soluble nickel salts can cause nausea, vomiting and diarrhea. The printer may have sharp sheet metal edges. Exercise caution when working on the printer. CAUTION: The printer contains parts that are electrostatic discharge (ESD) sensitive. Always service it 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 screwhole becomes stripped, repair the screw-hole or replace the affected assembly. Always remove the toner cartridge before removing or replacing assemblies and parts. Note the lengths, diameters, and locations of screws. Be sure to use them in their original locations during reassembly. 152 7 Removal and Replacement C4170-90959