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This chapter describes the procedures for removing and installing the chassis cover. Reasons for opening the chassis include replacement of field-replaceable units (FRUs) and the installation or removal of grounding jumpers for unbalanced (BNC) T1/E1 ports.
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Note FRU replacement procedures are described in the document Installing and Removing Field-Replaceable Units in the Cisco MC3810 Multiservice Access Concentrator. Installation or removal of grounding jumpers is specified in the "T1/E1 Connections to Network" section and the "Digital Voice Connections" section. |
The following tools are required for removing and installing the cover of a Cisco MC3810 series concentrator:
This section explains how to open the chassis by removing the chassis cover.
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Warning Do not touch the power supply when the power cord is connected. For systems with a power switch, line voltages are present within the power supply even when the power switch is off and the power cord is connected. For systems without a power switch, line voltages are present within the power supply when the power cord is connected. |
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Warning Before opening the chassis, disconnect the telephone-network cables to avoid contact with telephone-network voltages. |
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Warning Do not work on the system or connect or disconnect cables during periods of lightning activity. |
Refer to Parts A and B in Figure 5-1 and follow these steps to remove the chassis cover:
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Warning Before working on a system that has an on/off switch, turn OFF the power. |
For DC-powered units, observe the following safety precaution:
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Warning Before performing any of the following procedures, 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. |
Step 2 Attach an ESD-preventive wrist strap.
Step 3 Disconnect all interface cables from the rear panel.
Step 4 Turn the concentrator upside down so that the top of the chassis is resting on a flat surface and the front of the chassis is facing you. (See Figure 5-1, Part A.)
Step 5 Remove the single screw located on the bottom of the chassis (on the chassis side closest to you).
Step 6 If necessary, insert a medium flat-blade screwdriver into the slots shown in Figure 5-1, Part A, and gently rotate the blade so that the top and bottom sections separate slightly.
Step 7 Holding the chassis with both hands, position it as shown in Figure 5-1, Part B.
Step 8 Gently pull the top section away from the bottom section. (See Figure 5-1, Part B.) The fit is very snug. It might be necessary to work the chassis sections apart at one end and then the other until the top section is removed from the bottom section.
Follow these steps to close the chassis by installing the cover:
Step 2 Press the two chassis sections together:
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Caution To fit the two sections together, it might be necessary to work them together at one end and then the other, working back and forth; use care to prevent bending of the chassis edges. |
Step 3 When the two sections fit together snugly, turn the chassis so that the bottom is facing up, with the front panel toward you.
Step 4 Replace the cover screw. The recommended screw torque is 8 to 9 in-lb (0.90 to 1.02 N·m).
Step 5 Reinstall the chassis on the wall, rack, desktop, or table.
Step 6 Reconnect all cables.
Posted: Wed Aug 2 14:08:13 PDT 2000
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