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Replacing Parts
To remove a back card, perform the following steps:
Remove any cables connected to the back card.
Step 1
Step 2
Use a flat screwdriver to unscrew the two retaining screws in the back card's faceplate.
Step 3
Pull the two extraction levers into the horizontal position. This will start the card extraction.
Step 4
Gently pull the card out of the card cage.
To install a back card, perform the following steps.
Position the extraction levers so that they lie flush with the card's faceplate.
Step 1
Position the rear card guides over the appropriate slot at the top and bottom of the card cage.
Step 2
Gently slide the card all the way into the slot.
Step 3
Tighten the two captive screws on the back card's faceplate.
Step 4
Tighten the upper and lower screws alternately to prevent misalignment of the card. Tighten the screws
to secure the card. Do not overtighten.
Warning
Cards must be inserted in the correct slot positions. This is particularly true with back cards. If
service module back cards are inserted into slots intended only for ASC and/or BNM back cards
(slots 1, 2, 3, and 4) damage to the card and backplane can result. If you accidentally attempt to
insert a service module back card into slots 1, 2, 3, or 4 and have difficulty in operating the shelf,
examine the backplane pins and the connector on the wrongly inserted back card to see if they
have been bent or damaged.
Replacing a DC Power Entry Module
DC power entry modules (PEMs) contain few active components so they should rarely need
replacement. Access is from the back of the shelf. To remove a PEM, perform the following steps:
Step 1
Press the red button on the power entry module you need to replace. This removes power from the
module.
Disconnect the 48V DC power cable from the module.
Step 2
Pull out the power entry module from its slot.
Step 3
Step 4
Slide in the replacement module until its connector seats in its socket.
Step 5
Replace the 48V DC power cable.
Step 6
Press the black button on the power entry module until it latches in the IN position.
Cisco MGX 8220 Installation and Configuration
8-22
Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003
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Table of Contents
Troubleshooting
