Replace an Alarm Maintenance Unit (AMU1)

Electrostatic Discharge (ESD)

Observe and follow all ESD instructions while handling Tellabs plug-in equipment.

Caution! The Tellabs plug-in equipment uses semiconductor devices that can be damaged by electrostatic discharge (ESD). Do not remove a plug-in from a protective packing box or equipment rack until the time of installation or replacement. To equalize the static charge on the plug-in, establish a body path to the ground using an ESD wrist strap connected to an ESD ground. [If storing or shipping the plug-in becomes necessary, place the plug-in in a conductive shipping box to prevent static buildup.]

Apply the following precautions:

• Use grounded wrist straps, table mats, floor mats
• Handle static-sensitive devices in the nonconductive areas
• Place static-sensitive cards into an antistatic plastic bag    
• Use protective ESD-sensitive packing and shipping bags when returning repairable components

Procedure

To replace the Alarm Maintenance Unit (AMU1):

1. If not already open, open the cover of the Tellabs 1150 MDS5 OLT (see Figure below).

Figure 1: Tellabs 1150 MDS5

2. Locate the Alarm Maintenance Unit (AMU).
3. Disconnect and label any alarm inputs and outputs from the AMU faceplate.
4. Rotate the upper and lower card ejectors to eject the AMU from the backplane connector.
5. Remove the AMU from the MDS5 and place in an ESD protective package.

 Figure 2: Alarm Maintenance Unit (AMU1) 

6. Carefully insert the card into the upper and lower card guides until the card contacts the backplane connector. Then apply equal pressure on both upper and lower ejectors.
7. Upon insertion, the STAT LED illuminates RED while performing internal power-up diagnostics. Upon successful completion of the power-up diagnostics, the STAT LED blinks GREEN at a 0.5 second interval while initializing. Upon completion of initialization, the STAT LED illuminates solid GREEN.
8. Did the STAT LED sequence described in Step 8?
   • If YES, go to Step 9.
   • If NO, remove the card and replace it with a known good unit.
9. Reconnect the alarm inputs and outputs removed in Step 3.