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HP LaserJet 9000dn Service Manual: Introduction; Removal And Replacement Strategy; Repair Notices; Electrostatic Discharge (esd)

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Introduction

Removal and replacement strategy
This chapter documents removal and replacement of field replaceable units (FRUs) only.
Replace parts in the reverse order of their removal. Directions for difficult or critical replacement
procedures are included.
Repair notices
WARNING!
The printer can have sharp sheet metal edges. Exercise caution when working on the printer.
CAUTION
Always remove the print cartridge before removing or replacing assemblies and parts. (See page 135.)
IMPORTANT: Put the print cartridge in the original print cartridge bag, or, if the bag is not available,
cover it with a piece of paper. Light can damage the print cartridge.
To install a self-tapping screw, first turn it counter-clockwise 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.
Note
Note the lengths, diameters, and locations of screws. 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 locate. When replacing
wire harnesses, always use the provided wire loops, lance points, or wire-harness guides.
Electrostatic discharge (ESD)
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.
Watch for the ESD symbol (shown at left) to identify the parts that are sensitive to ESD. Protect these
parts by using an ESD wrist strap and protective ESD pouches.
Required tools
The following tools are needed to service this printer:
l
#2 Phillips-head screwdriver with magnetic tip
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T-10 Torx screwdriver
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T-20 Torx screwdriver
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small flatblade screwdriver
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small needle-nose pliers
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ESD mat
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penlight
CAUTION
A PoziDriv screwdriver will damage screw heads on the printer. Use a #2 Phillips-head screwdriver.
If you have a multi-speed screwdriver, use a torque limiter.
C8519-90912
Introduction 117

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Troubleshooting

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