Compaq 470007-802 Deskpro EN Series of Personal Computers Maintenance and Serv - Page 36

Service Considerations, Power Supply Fan, Tools and Software Requirements, Screws

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3.3 3.3.1 3.3.2 3.3.3 Service Considerations Listed below are some of the considerations that you should keep in mind during the disassembly and assembly of the computer. Power Supply Fan The power supply fan is a variable-speed fan based on the temperature in the power supply. CAUTION: The cooling fan is off only when the computer is turned off or the power cable has been disconnected. The cooling fan is always on in all other instances (when the computer is either in the "On," "Standby," or "Suspend" mode). You must disconnect the power cord from the power source before opening the computer to prevent system board or component damage. Tools and Software Requirements To service the computer, you need the following: ! Torx T-15 screwdriver (Compaq screwdriver with bits PN 161946-001) ! Flat-bladed screwdriver (may sometimes be used in place of the Torx screwdriver) ! Diagnostics software ! Compaq tamper-resistant T-15 wrench (Smart Cover FailSafe Key, PN 166527-001) or Compaq tamper-resistant bits (Smart Cover FailSafe Key, PN 166527-002) Screws The screws used in the computer are not interchangeable. They may have standard or metric threads and may be of different lengths. If an incorrect screw is used during the reassembly process, it can damage the unit. Compaq strongly recommends that all screws removed during disassembly be kept with the part that was removed, then returned to their proper locations. ✎ As each subassembly is removed from the computer, it should be placed away from the work area to prevent damage 3-6 Removal & Replacement Preliminaries

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3-6
Removal & Replacement Preliminaries
3.3
Service Considerations
Listed below are some of the considerations that you should keep in mind during the
disassembly and assembly of the computer.
3.3.1
Power Supply Fan
The power supply fan is a variable-speed fan based on the temperature in the power
supply.
CAUTION:
The cooling fan is off
only
when the computer is turned off or the power cable has been
disconnected.
The cooling fan is always on in all other instances (when the computer is either in the “On,” “Standby,”
or “Suspend” mode).
You must disconnect the power cord from the power source before opening the computer to prevent
system board or component damage.
3.3.2
Tools and Software Requirements
To service the computer, you need the following:
!
Torx T-15 screwdriver (Compaq screwdriver with bits PN 161946-001)
!
Flat-bladed screwdriver (may sometimes be used in place of the Torx screwdriver)
!
Diagnostics software
!
Compaq tamper-resistant T-15 wrench (Smart Cover FailSafe Key,
PN 166527-001) or Compaq tamper-resistant bits (Smart Cover FailSafe Key,
PN 166527-002)
3.3.3
Screws
The screws used in the computer are not interchangeable. They may have standard or
metric threads and may be of different lengths. If an incorrect screw is used during the
reassembly process, it can damage the unit. Compaq strongly recommends that all screws
removed during disassembly be kept with the part that was removed, then returned to their
proper locations.
✎
As each subassembly is removed from the computer, it should be placed away from the work area
to prevent damage