14
Additional Memory Installation
The memory sockets on the main board can be populated with up to two industry-standard DIMMs. The
POS-420 Expander plus comes standard with at least one preinstalled DIMM. To achieve maximum memory
performance, up to 2GB of memory can be added.
CAUTION:
You must disconnect the power cord and wait approximately 30 seconds for the
power to drain before adding or removing memory cards. Regardless of the
power-on state, voltage is always supplied to the memory modules as long as the
system is plugged into an active AC outlet. Adding or removing memory modules
while voltage is present may cause irreparable damage to the memory modules
or main board. If you see an LED light on the main board, voltage is still present.
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 and/or oxidation resulting from having incompatible
metals in contact with each other.
Static electricity can damage the electronic components of the system or optional
cards. Before beginning these procedures, ensure that you are discharged of
static electricity by briefly touching a grounded metal object.
When handling a memory module, be careful not to touch any of the contacts.
Doing so may damage the module.
1.
Turn off the system power properly through the operating system, then turn off any external
devices.
2.
Disconnect the power cord from the power outlet and disconnect any external devices.
CAUTION:
Regardless of the power-on state, voltage is always present on the main board as
long as the system is plugged into an active AC outlet. You must disconnect the
power cord to avoid damage to the internal components of the system.
WARNING!
To reduce risk of personal injury from hot surfaces, allow the internal system
components to cool before touching.
NOTE:
There are two DIMM sockets on the main board: U11 is located on the top side,
while U23 is located on the bottom (below the RAM cover).
To replace the memory card on the main board's top side, the system box cover
must be removed.
If the system has a UPS installed, the battery connector and battery pack must
first be removed to gain access to the memory sockets. Please refer to the
Uninterrupted Power Supply Installation section.