HP Visualize J5000 hp Visualize J5000, J7000 workstations service handbook (a4 - Page 106

System Board Tray Assembly

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Field Replaceable Units (FRUs) FRU Removal and Replacement System Board Tray Assembly The system board in the J5000 and J7000 workstation is mounted on a tray. The following procedures describe how to remove and replace the system board tray assembly as a complete unit. NOTE If the LCD displays an error message that relates to a turbocooler fan on a microprocessor mounted on the system board, you will need to replace the entire system board tray assembly. Follow the removal and replacement procedures in this section to do so. Removing the System Board Tray Assembly To remove the system board tray assembly, do the following: 1. Remove the top panel and left side panel from the workstation. 2. Remove the bus bar shield and either the four bus bar thumbscrews on the J5000 workstation, or the five bus bar thumbscrews on the J7000. 3. Remove the flex cable connecting the system board to the I/O board. To do this, first remove the flex cable retainer. Then pull the flex cable outward by its handles to relieve the flex cable from the board connectors. 4. If you are removing the system board from a J7000 workstation, you must also remove the front and rear air dividers and the two DC/DC converter units that are attached to the J7000's system board. To remove these components, follow the removal procedures in the section titled "DC/DC Converter Units and Air Dividers (J7000 Only)" on page 101. 5. Remove the memory DIMMs from the system board to avoid damage to the DIMMs. To do this, follow the removal procedures in the section titled "Memory DIMMs" on page 99. 6. Disconnect the three fan cables by squeezing their connector tabs to release them from the system board. Note that you must also pull the J7000 workstation's fan cables out of the system board's tray handle for clearance. 7. Disconnect the ribbon cable for the power switch/LCD assembly from the system board by pulling on the loop. 8. Remove the three outer T-15 Torx screws that secure the system board tray assembly to the rear panel of the workstation. CAUTION The J7000 workstation's system board has four turbocoolers mounted vertically to the left edge. Thus, the complete system board tray assembly will be heavily weighted to one side. Approximate total weight for the system board tray assembly is 12 lbs. So you should be prepared to handle the weight accordingly in the next two steps. 102 Chapter 4

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102
Chapter 4
Field Replaceable Units (FRUs)
FRU Removal and Replacement
System Board Tray Assembly
The system board in the J5000 and J7000 workstation is mounted on a tray. The following
procedures describe how to remove and replace the system board tray assembly as a
complete unit.
NOTE
If the LCD displays an error message that relates to a turbocooler fan on a
microprocessor mounted on the system board, you will need to replace the
entire system board tray assembly. Follow the removal and replacement
procedures in this section to do so.
Removing the System Board Tray Assembly
To remove the system board tray assembly, do the following:
1.
Remove the top panel and left side panel from the workstation.
2.
Remove the bus bar shield and either the four bus bar thumbscrews on the J5000
workstation, or the five bus bar thumbscrews on the J7000.
3.
Remove the flex cable connecting the system board to the I/O board. To do this, first
remove the flex cable retainer. Then pull the flex cable outward by its handles to relieve
the flex cable from the board connectors.
4.
If you are removing the system board from a J7000 workstation, you must also remove
the front and rear air dividers and the two DC/DC converter units that are attached to
the J7000’s system board. To remove these components, follow the removal procedures
in the section titled “DC/DC Converter Units and Air Dividers (J7000 Only)” on page
101.
5.
Remove the memory DIMMs from the system board to avoid damage to the DIMMs. To
do this, follow the removal procedures in the section titled “Memory DIMMs” on page
99.
6.
Disconnect the three fan cables by squeezing their connector tabs to release them from
the system board. Note that you must also pull the J7000 workstation’s fan cables out of
the system board’s tray handle for clearance.
7.
Disconnect the ribbon cable for the power switch/LCD assembly from the system board
by pulling on the loop.
8.
Remove the three outer T-15 Torx screws that secure the system board tray assembly to
the rear panel of the workstation.
CAUTION
The J7000 workstation’s system board has four turbocoolers mounted
vertically to the left edge. Thus, the complete system board tray assembly will
be heavily weighted to one side. Approximate total weight for the system
board tray assembly is 12 lbs. So you should be prepared to handle the weight
accordingly in the next two steps.