Nortel Meridian 1 Option 11C Upgrade Manual page 124

Page 124 of 224
553-3021-250 Standard 7.00
Upgrade the NTDK20AB SSC to NTDK20EA or later
4 Disconnect the power from the cabinet.
Set the circuit breaker switch on the front of the power supply unit in
the cabinet to OFF.
If equipped with reserve battery power, set the circuit breaker switch
inside the reserve battery power unit to OFF.
5 Attach an antistatic wrist strap to your wrist.
An antistatic wrist strap is in the bottom of Option 11 cabinets.
Wear an antistatic wrist strap when handling circuit cards or any of its
components. Be careful to not damage any components on the SSC
while performing the following steps.
6 Remove the NTDK20 SSC card from the cabinet.
7 Remove any existing Fiber Expansion Daughterboards from the
SSC card.
8 Remove the existing faceplate from the NTDK20 SSC.
To remove the faceplate, release the four plastic clips fastening the
faceplate to the circuit card (see Figure 52). Carefully pull the faceplate
forward.
April 2000
CAUTION