HP Z800 Owners Manual

System board
This section describes replacing the system board.
Removing the system board
1.Disconnect power from the workstation (see Predisassembly procedures on page 73).
2.Remove the side access panel (see 
Removing the side access panel on page 75).
3.Remove the expansion card support (see 
Removing the expansion card support on page 77).
4.Remove the airflow guide (see 
Removing the airflow guide on page 76).
5.Remove the memory fan assembly (see 
Removing the memory fans on page 136).
6.Remove the...

b.Place the graphics cables in the hard drive bays.
Place the CPU, memory power, and rear system fan cables over the chassis edge.
TIP:Use the CPU and memory power cables to hold up the shorter rear system fan cable.
The following figure presents an example of these steps.
10.Slide the system board forward as shown in the following figure .
Figure 5-104  Removing the system board
11.Using the CPU heatsinks as handles, lift the system board straight up and then tilt the board to
remove it from the chassis...

Installing the system board
TIP:For convenience, you may install the CPUs and the CPU heatsinks before installing the system
board in the chassis.
1.Ensure that all cables are clear of the bottom of the chassis (see Removing the system board
on page 159).
2.Tilt the system board and lower it into the chassis, ensuring that all standoffs engage the chassis
keyholes.
Ensure that the system board connectors engage correctly with the rear I/O panel.
3.Push back on the board while maintaining downward...

5.Rotate the battery enough to get beyond the latch, and then lift it straight up as shown in the
following figure.
Figure 5-105  Removing the battery
162 Chapter 5   Replacing components ENWW 

Installing the battery
1.Confirm the polarity (positive or negative) of the battery to position it correctly in the battery holder.
2.Place the battery edge under the plastic housing tab and press gently until it snaps into place.
3.Reinstall all removed components and reconnect any cables that have been disconnected.
Product recycling
HP encourages customers to recycle used electronic hardware, HP original print cartridges, and
rechargeable batteries.
For information about recycling HP components or...

6 Diagnostics and troubleshooting
This chapter describes the tools available for diagnosing and troubleshooting system issues, and
includes these topics:
Topics
Calling technical support on page 165
Locating ID labels on page 165
Locating warranty information on page 166
Diagnosis guidelines on page 167
Troubleshooting checklist on page 168
HP troubleshooting resources and tools on page 170
HP troubleshooting resources and tools on page 170
HP troubleshooting resources and tools on page 170...

Calling technical support
At times you might encounter an issue that requires technical support. When you call technical support:
●Have the workstation readily accessible.
●Write down the workstation serial numbers, product numbers, model names, and model numbers
and have them in front of you.
●Note any applicable error messages.
●Note any add-on options.
●Note the operating system.
●Note any third-party hardware or software.
●Note the details of any blinking LEDs on the front of the workstation.
●Note...

Each HP Workstation has two unique serial number labels  and a Certificate of Authentication (COA)
label 
2 as shown in the figure below.
Figure 6-1  Workstation label locations
In general, the serial number labels can be found on the top panel or on the side of the workstation and
at the rear of the workstation (your workstation may look different). Keep this number available when
contacting customer service for assistance.
A product number is generally located next to the serial number.
The COA is used...

Diagnosis guidelines
If you encounter a problem with the workstation, monitor, or software, the following sections provide a
list of general suggestions that help you isolate and focus on the problem before taking further action.
Diagnosis at startup
●Verify that the workstation and monitor are plugged into a working electrical outlet.
●Remove all diskettes, CDs, or USB drive keys from your system before turning it on.
●Verify that the workstation is turned on and the green power light is on.
●If you...

Diagnosis during operation
●Look for blinking LEDs on the front of the workstation. The blinking lights are error codes that will
help you diagnose the problem. Refer to the 
Diagnostic LED and audible (beep) codes
on page 191 section of this document for information on interpreting diagnostic lights and audible
codes.
●Press and hold any key. If the system beeps, then your keyboard is operating correctly.
●Check all cables for loose or incorrect connections.
●Wake the workstation by pressing any key on...