Specifications

24 Memory Replacement Instructions for the Network Processing Engine and Input/Output Controller
Removing and Replacing Memory DRAM SIMMs, SDRAM DIMMs, and Boot ROMs
Disconnecting DC-Input Power
To disconnect DC-input power to a Cisco 7200 series router or a Cisco uBR7200 series router,
complete the following steps:
Warning Before completing any of the following steps, and to prevent short-circuit or shock
hazards, ensure that power is removed from the DC circuit. To ensure that all power is OFF, locate
the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the
OFF position, and tape the switch handle of the circuit breaker in the OFF position.
Warning When installing the unit, the ground connection must always be made first and
disconnected last.
Step 1 Turn OFF the power source and disconnect the –48V and +48V leads from the power
source. You can leave the ground cable connected.
Step 2 For a Cisco 7200 series router, remove the cable tie that secures the –48V, +48V, and
ground leads to the power supply faceplate. Save the cable tie.
Note The cable tie that accompanied your Cisco 7200 series DC-input power supply can
be removed and replaced on the power supply without the use of a tool. If you secured
the DC-input power supply leads to the power supply faceplate using a different type of
cable tie, use a wire stripper to cut that cable tie from the power supply.
For a Cisco uBR7200 series router, use a 7-mm wrench or nut driver (or adjustable
wrench) to loosen and remove the two M4 nuts from the strain-relief cover that secures
the –48V and +48V leads to the power supply faceplate. Remove the strain-relief cover.
(See Figure 14.)
Figure 14 Removing the Strain-Relief Cover from a Cisco uBR7200 Series DC-Input
Power Supply
M5 grounding lug
+48V lead
-48V lead
12522
Power
switch
Power
receptacle
Captive installation screw
(on both sides of power supply)
Strain-relief
cover
M4 nuts
M5 grounding receptacles