HP 2700n Service Manual - Page 110
Removal and replacement strategy, Introduction
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Removal and replacement strategy Introduction This chapter describes the removal and replacement of field-replaceable units (FRUs) only. Replacing FRUs is generally the reverse of removal. Occasionally, notes are included to provide directions for difficult or critical replacement procedures. HP does not support repairing individual subassemblies or troubleshooting to the component level. WARNING! Turn the printer off, wait 5 seconds, and then remove the power cord before attempting to service the printer. If this warning is not followed, severe injury can result, as well as damage to the device. The power must be on for certain functional checks during troubleshooting. However, the power supply should be disconnected during parts 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 parts can have sharp edges. Be careful when handling sheet-metal parts. CAUTION Some parts are sensitive to electrostatic discharge (ESD). Look for the ESD reminder when removing printer parts. Always perform service work at an ESD-protected workstation or mat. If an ESD workstation or mat is not available, ground yourself by touching the sheet-metal chassis before touching an ESD-sensitive part. Protect the ESD-sensitive parts by placing them in ESD pouches when they are out of the printer. CAUTION Do not bend or fold the flat flexible cables (FFCs) during removal or installation. NOTE 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. Do not overtighten. If a self-tapping screw-hole becomes stripped, repair the screw-hole or replace the affected assembly. The printer shown in this chapter is slightly different than this model. It has a fan mounted to the front cover, a duplex-feed-drive assembly, and a duplexing-reverse-drive assembly mounted under the upper (top) cover. This printer does not have these parts. The electrostatic transfer belt (ETB) shown in this chapter is for a different model printer. The ETB for this model looks different. 92 Chapter 5 Removal and replacement ENWW