Dell Precision WorkStation 420 Service Manual page 44

FAN_SYS
HD_LED
IDEn
KYB
LINE_IN
LINE_OUT
MOUSE
PANEL
PARALLEL
PCIn
POWER_1
POWER_2
RIMMx_y
SERIAL 1/2
SLOT1_PRI
SLOT1_SEC
STANDBY
STR_LED
USB
TAPI
WOL
RIMMs
CAUTION: Before you remove the computer cover, see
To remove a Rambus in-line memory module (RIMM), perform the following steps.
CAUTION: To avoid the possibility of electric shock, turn off the computer and any peripherals, disconnect them from their
electrical outlets, and then wait at least 5 seconds before you remove the computer cover.
CAUTION: The RIMMs can get extremely hot during system operation. To avoid dangerous burns, be sure that the RIMMs
have had sufficient time to cool before you touch them.
NOTE: Before disconnecting a peripheral from the system or removing a component from the system board, verify that the standby
power LED on the system board has turned off. For the location of this LED, see
1. Remove the computer cover according to the instructions in
2. Press the securing clips outward simultaneously until the RIMM disengages and pops out slightly from the socket (see
Figure 30. RIMM Removal
To install a RIMM, perform the following steps.
CAUTION: To avoid the possibility of electric shock, turn off the computer and any peripherals, disconnect them from their
electrical outlets, and then wait at least 5 seconds before you remove the computer cover. Also, before you upgrade memory,
see the other precautions in
1. Remove the computer cover according to the instructions in
Microprocessor fan connector
Hard-disk drive LED connector
EIDE interface connector
Keyboard connector
External microphone connector
External speaker connector
Mouse connector
Control panel connector
Parallel port connector
PCI expansion-card connector
Main power input connector
3.3-V power input connector
RIMM socket
Serial port connectors
Primary microprocessor connector
Secondary microprocessor connector
Standby power LED
Suspend-to-RAM LED
USB connectors
Telephony connector
Remote Wakeup on LAN power connector
"Precautionary
"Computer
1 Securing clips (2)
"Precautionary Measures. "
"Computer
Measures."
Figure 28.
Cover."
Cover."
Figure 30).