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This appendix contains procedures on how to replace memory chips in the Cisco AS5400 field-replaceable units. The appendix contains the following sections:
This section describes how to open the chassis by removing the chassis cover.
You need the following tools:
Note the following safety recommendations:
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Warning Before opening the chassis, disconnect the telephone-network cables to avoid contact with telephone-network voltages. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
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Warning Before working on a chassis or working near power supplies, unplug the power cord on AC units; disconnect the power at the circuit breaker on DC units. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
NVRAM in the universal access server uses an internal lithium battery to maintain data. Although this is not a field-serviceable component, we are required to provide the following safety warning:
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Warning There is the danger of explosion if the battery is replaced incorrectly. Replace the battery only with the same or equivalent type recommended by the manufacturer. Dispose of used batteries according to the manufacturer's instructions. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
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Warning Before working on equipment that is connected to power lines, remove jewelry (including rings, necklaces, and watches). Metal objects will heat up when connected to power and ground and can cause serious burns or weld the metal object to the terminals. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
You must open the access server chassis to gain access to its interior components: boot read-only memory (ROM) software, synchronous dynamic random-access memory, dual in-line memory (SDRAM DIMMs) modules, and Flash memory SIMMs. (When you replace the boot ROMs, you must also remove all feature cards in the chassis.)
Take these steps:
Step 2 If using a DC-powered unit, refer to Figure A-1 and complete steps a to d.
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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. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
a. Loosen the six locking screws for the negative, return, and ground connections on the DC power supply terminal blocks.
b. Remove the -48 VDC wires from the terminal block negative connectors (-) .
c. Remove the 48 VDC Return wires from the terminal block positive connectors (+) .
d. Remove the safety ground (green wires) from the terminal block ground connectors.
Step 3 Remove all interface cables from the rear panel of the access server.
Step 4 Place the access server so that the front panel is facing you.
Step 5 Remove the four screws on the chassis cover, as shown in Figure A-2.
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Caution Do not connect 48 VDC Return wire to chassis. A single point ground is recommended at the power distribution rack. |
Step 6 Gently pry the cover off with a flatblade screwdriver. Lift the chassis cover upward, as shown in Figure A-3, and pull it away from the tabs on the rear of the chassis.
To upgrade the boot ROM software to a new software image, you must replace the existing boot ROMs.
You will need the following tools and equipment:
Take these steps:
For DC powered units, note the following warning:
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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. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
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Warning Before opening the chassis, disconnect the telephone-network cables to avoid contact with telephone-network voltages. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
Step 2 Remove all interface cables from the DFC cards.
Step 3 Attach an ESD-preventive wrist strap.
Step 4 Remove the chassis cover. (See the instructions in the section "Removing the Chassis Cover" on page A 1.)
Step 5 Remove all cards to access the system card. (See the Cisco AS5400 Universal Access Server Card Installation Guide for instructions on removing various cards.)
Step 6 Locate the boot ROM on the system card using Figure A-4.
Step 7 Gently extract the old ROM with a ROM extraction tool and set the old boot ROM on a nonconductive surface. Do not use excessive force because the socket might break.
Step 8 Insert the new boot ROM into the socket. Be careful not to bend or crush any of the bottom pins. If necessary, use needlenose pliers to straighten out any bent pins.
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Caution The notch in the ROM must align with the notch in the socket on the system card. If the ROM is installed backwards, damage will occur when the access server is powered ON. |
Step 9 Replace any cards removed. (See the AS5400 Universal Access Server Card Installation Guide for instructions on installing specific cards.)
Step 10 Replace the access server chassis cover. (See the instructions in the section, "Replacing the Chassis Cover," on page A-12.)
Step 11 Power ON the access server. If error messages relating to memory are displayed, remove the new boot ROMs and reinstall them, taking care to seat the ROMs firmly in their sockets.
This section describes how to replace SDRAM DIMMs on the system card. You might need to upgrade the SDRAM DIMMs for the following reasons:
The system card contains three sockets for SDRAM DIMMs (see Figure A-4):
You need the following tools and equipment:
Take these steps:
For DC-powered units only, note the following warning.
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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. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
Step 2 Remove all interface cables from the DFC cards.
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Warning Before opening the chassis, disconnect the telephone-network cables to avoid contact with telephone-network voltages. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
Step 3 Attach an ESD-preventive wrist strap.
Step 4 Remove the chassis cover. (See the instructions in the section "Removing the Chassis Cover" earlier in this appendix.)
Step 5 Remove all cards to access the system card. (See the Cisco AS5400 Universal Access Server Card Installation Guide for instructions on removing specific cards.)
Step 6 Use Figure A-4 to locate the DIMM you are replacing.
Step 7 Pull the socket latches away from the DIMM, and then pull the DIMM out of the socket, as shown in Figure A-5. The latches hold the DIMM tightly, so be careful not to break the socket.
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Caution To prevent damage, do not press on the center of the DIMM. Handle the DIMM carefully. |
Step 8 Position the new DIMM so that the polarization notch is located at the right end of the DIMM socket.
Step 9 Insert the new SDRAM DIMM by sliding the end with the metal fingers into the DIMM socket as shown in Figure A-6.
Step 10 Snap the latches into place. Do not use excessive force because the socket might break.
Step 11 Replace the access server chassis cover. (See "Replacing the Chassis Cover" on page A 12.)
Step 12 Replace the feature cards. (See the Cisco AS5400 Universal Access Server Card Installation Guide for instructions on replacing specific cards.)
Step 13 Power ON the access server. If error messages relating to memory are displayed, remove the SDRAM DIMM and reinstall it, taking care to seat the DIMM firmly in its socket.
The system card contains three sockets for Flash memory SIMMs (see Figure A-4):
The Flash memory SIMMs must be purchased from Cisco. For ordering information, refer to the section "Obtaining Technical Assistance" in the Preface.
You need the following tools and equipment:
Take these steps:
Step 2 Remove all interface cables from the DFC cards.
For DC-powered units only, note the following warning.
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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. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
Step 3 Attach an ESD-preventive wrist strap.
Step 4 Remove the chassis cover. (See the previous procedure in the section "Removing the Chassis Cover" on page A-1.
Step 5 Place the chassis so that the system card is oriented as shown in Figure A-7, with the Flash memory SIMMs toward you. The system code SIMM sockets are labeled SIMM0 and SIMM1; the rxboot SIMM socket is labeled SIMM.
Step 6 Remove the existing Flash memory SIMM by pulling outward on the socket latches and then lifting the SIMM out of the socket (see Figure A-7).
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Caution To prevent damage, do not press on the center of the SIMMs. Handle each SIMM carefully. |
Step 7 Repeat these steps for all the Flash memory SIMMs that you need to replace.
Step 8 Insert the new SIMM by sliding the end with the metal fingers into the appropriate SIMM socket at approximately a 45-degree angle to the system card as shown in Figure A-8.
Step 9 Gently rotate the SIMM until the latch on either side snaps into place. Do not use excessive force because the connector might break. When inserting the new SIMM, make sure that the polarization notch is located at the right end of the SIMM socket.
Step 10 Replace the access server chassis cover. (See the instructions in the following section "Replacing the Chassis Cover.")
Step 11 Replace any cards removed. (See the Cisco AS5400 Universal Access Server Card Installation Guide for instructions on installing various cards.) Connect the access server to a console terminal.
Step 12 Power ON the access server. If any memory-related error messages appear, remove the Flash memory SIMM and reinstall it, taking care to seat the SIMM firmly in the socket.
This section describes the procedure for replacing the chassis cover.
To replace the chassis cover, take these steps:
Step 2 Hold the chassis cover over the chassis bottom, and align each of the cover tabs with the chassis tabs at the top rear of the chassis, as shown in .
Step 3 Lower the front of the top cover to close the chassis, and ensure the following:
When the chassis cover is properly assembled, no tabs are visible, as shown in Figure A-10.
Step 4 Secure the chassis cover with four screws.
Step 5 Reinstall the chassis on a rack, desktop, or table.
Step 6 Reinstall all interface cables.
Step 7 Reconnect the two AC power cords to the power supply. Or, if using DC power, refer to Figure A-11, and then complete steps a to d.
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Warning The illustration shows the DC power supply terminal block. Wire the DC power supply using the appropriate wire terminations at the wiring end, as illustrated. The proper wiring sequence is ground to ground, return to return, and negative to negative. Note that the ground wire should always be connected first and disconnected last. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
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Caution Do not overtorque the terminal block contact screws. The recommended torque is 5.0 in.-lb (0.56 N-m). |
a. Insert the safety ground (green wires) into the terminal block ground connectors and tighten the locking screws. Ensure that no bare wire is exposed.
b. Insert the 48 VDC Return wires into the terminal block positive connectors (+) and tighten the locking screws. Ensure that no bare wire is exposed.
c. Insert the -48 VDC wires into the terminal block negative connectors (-) and tighten the locking screws. Ensure that no bare wire is exposed.
d. Make sure the power supply cords are secured to the cable strain-relief clamps on the DC power supply with cable ties.
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Warning After wiring the DC power supply, remove the tape from the circuit breaker switch handle and reinstate power by moving the handle of the circuit breaker to the ON position. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
Step 8 Power ON the access server.
The internal power supply fan should power on.
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Caution Do not connect the 48-VDC Return wire to chassis. A single point ground is recommended. |
Posted: Tue Sep 26 14:35:56 PDT 2000
Copyright 1989-2000©Cisco Systems Inc.