Removal and replacement strategy
Use this section to find procedures for the removal and replacement of field replaceable units (FRUs).
Introduction
This chapter describes the removal and replacement of field-replaceable units (FRUs) only.
Replacing FRUs is generally the reverse of removal. Occasionally, notes and tips are included to provide
directions for difficult or critical replacement procedures.
HP does not support repairing individual subassemblies or troubleshooting to the component level.
Note the length, diameter, color, type, and location of each screw. Be sure to return each screw to its original
location during reassembly.
Incorrectly routed or loose wire harnesses can interfere with other internal components and can become
damaged or broken. Frayed or pinched harness wires can be difficult to find. When replacing wire harnesses,
always use the provided wire loops, lance points, or wire-harness guides and retainers.
Considerations during removal and replacement
WARNING! Turn the product off, wait 5 seconds, and then remove the power cord before attempting to
service the product. If this warning is not followed, severe injury can result, in addition to damage to the
product. The power must be on for certain functional checks during troubleshooting. However, disconnect
the power supply during parts removal.
Never operate or service the product with the protective cover removed from the laser/scanner assembly.
The reflected beam, although invisible, can damage your eyes.
The sheet-metal parts might have sharp edges. Be careful when handling sheet-metal parts.
CAUTION: Do not bend or fold the flat flexible cables (FFCs) during removal or installation. Also, do not
straighten pre-folds in the FFCs. You must fully seat all FFCs in their connectors. Failure to fully seat an FFC
into a connector can cause a short circuit in a PCA.
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.
TIP: For clarity, some photos in this chapter show components removed that would not be removed to
service the product. If necessary, remove the components listed at the beginning of a procedure before
proceeding to service the product.
Electrostatic discharge
CAUTION:
Some parts are sensitive to electrostatic discharge (ESD). Look for the ESD reminder when
removing product parts. Always perform service work at an ESD-protected workstation or mat, or use an ESD
strap. If an ESD workstation, mat, or strap 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 product.
2 Chapter 1 Removal and replacement ENWW
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