HP 1200 Service Manual - Page 79

Removal and replacement strategy WARNING! This chapter documents the removal and replacement of field replaceable units (FRUs) only. Replacement is generally the reverse of removal. Occasionally, notes are included to provide directions for difficult or critical replacement procedures. Unplug the power cord from the power outlet before attempting to service the printer. If this warning is not followed, severe injury can result. Certain functional checks during troubleshooting must be performed with power supplied to the printer. However, the power supply should be disconnected during removal. Never operate or service the printer with the protective cover removed from the laser/scanner assembly. The reflected beam, although invisible, can damage your eyes. The sheet metal edges of the printer can be sharp. Use caution when working on the printer. CAUTION Some printer parts are electrostatic discharge (ESD) sensitive. Always perform service work at an ESD-protected workstation. To install a self-tapping screw, first turn it counterclockwise to align it with the existing thread pattern, then carefully turn it 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 parts. See "Toner cartridge" on page 78. CAUTION Required tools ! #2 Phillips-head screwdriver with magnetic tip ! Small flatblade screwdriver ! Needle nose pliers ! ESD mat ! Penlight A PoziDriv screwdriver will damage screw heads on the printer. Use a #2 Phillips-head screwdriver. EN Removal and replacement strategy 77