HP Pro Tower 480 G9 Desktop PC Maintenance and Service Guide - Page 28

DIMM1 and DIMM3., When handling a memory module

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NOTE: The system does not operate properly if you install unsupported memory modules. There are two memory sockets on the system board, with two sockets per channel. The sockets are labeled DIMM1 and DIMM3. IMPORTANT: You must disconnect the power cord and wait approximately 30 seconds for the power to drain before adding or removing memory modules. Regardless of the power state, voltage is always supplied to the memory modules as long as the computer is plugged into an active AC outlet. Adding or removing memory modules while voltage is present can cause irreparable damage to the memory modules or system board. The memory module sockets have gold-plated metal contacts. When upgrading the memory, it is important to use memory modules with gold-plated metal contacts to prevent corrosion, oxidation, or both resulting from having incompatible metals in contact with each other. Static electricity can damage the electronic components of the computer or optional cards. Before beginning these procedures, be sure that you are discharged of static electricity by briefly touching a grounded metal object. For more information, see Electrostatic discharge information on page 10. When handling a memory module, be careful not to touch any of the contacts. Doing so can damage the module. Before replacing the memory modules, follow these steps: 1. Prepare the computer for disassembly (see Preparation for disassembly on page 19). 2. Remove the access panel (see Access panel on page 19). Replace a memory module: 1. To remove a memory module, open both latches of the memory module socket (1), and then remove the memory module from the socket (2). Memory modules (DIMMs) 21

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NOTE:
The system does not operate properly if you install unsupported memory modules.
There are two memory sockets on the system board, with two sockets per channel. The sockets are labeled
DIMM1 and DIMM3.
IMPORTANT:
You must disconnect the power cord and wait approximately 30 seconds for the power to
drain before adding or removing memory modules. Regardless of the power state, voltage is always supplied
to the memory modules as long as the computer is plugged into an active AC outlet. Adding or removing
memory modules while voltage is present can cause irreparable damage to the memory modules or system
board.
The memory module sockets have gold-plated metal contacts. When upgrading the memory, it is important
to use memory modules with gold-plated metal contacts to prevent corrosion, oxidation, or both resulting
from having incompatible metals in contact with each other.
Static electricity can damage the electronic components of the computer or optional cards. Before beginning
these procedures, be sure that you are discharged of static electricity by briefly touching a grounded metal
object. For more information, see
Electrostatic discharge information
on page
10
.
When handling a memory module, be careful not to touch any of the contacts. Doing so can damage the
module.
Before replacing the memory modules, follow these steps:
1.
Prepare the computer for disassembly (see
Preparation for disassembly
on page
19
).
2.
Remove the access panel (see
Access panel
on page
19
).
Replace a memory module:
1.
To remove a memory module, open both latches of the memory module socket
(1)
, and then remove the
memory module from the socket
(2)
.
Memory modules (DIMMs)
21