|
|
This section provides maintenance procedures for the physical components of the SES. It includes:
This section does not include detailed troubleshooting information for the two applications: SES as an IGX feeder or SES as PNNI controller. That information will be found in other documentation.
The Fan Tray Assembly, shown in Figure 3-1, can be removed and replaced when an SES is running if it is done very quickly. When the SES is running you must remove and replace the Fan Tray Assembly in less than two minutes. Individual fans in the Fan Tray Assembly are not field replaceable.
The Fan Tray Assembly is vertically installed on the left-side of the front of the SES chassis. It is held in place by one captive screw on its bottom; there is also an ejector lever on the bottom of the Fan Tray Assembly that can be used to unseat it from the backplane.
 | Caution Because of its shape, the Fan Tray Assembly has a tendency to drop suddenly against the chassis as it is being removed. Be sure to hold it with two hands and hold it firmly until it is completely removed from the chassis. There is small standoff on the upper left side of the Fan Tray slot in the SES card cage which the Fan Tray Assembly will ride on as it is removed and installed in the chassis. Still you should make sure to hold the Fan Tray Assembly firmly until you have completely removed it from the chassis. |
Once you have determined that a Fan Tray Assembly is faulty, follow these steps to remove and replace it:
Step 1 Make sure that you have the replacement Fan Tray Assembly and your tools ready.
Step 1 Open the SES door, if applicable, and locate the Fan Tray Assembly, shown in the left-side of the SES chassis as seen from the front. See Figure 3-2.
Step 2 Loosen the captive screw holding the Fan Tray Assembly to the SES chassis.
Step 3 Use the ejection lever added to the bottom of the fan and chassis to unseat the Fan Tray Assembly from the backplane.
You can use the combination tool used to open the door that is provided with the SES or a regular screwdriver for leverage on the injector. Slip it through the opening in the ejector lever and pull the lever out away from the SES.
Step 4 Pull the Fan Tray Assembly out carefully, holding it firmly with two hands so it does not drop suddenly against the SES chassis as it is removed.
There is a small standoff on the upper-left side of the chassis which the Fan Tray Assembly rides on that helps support it as it is being removed, but you must still be careful.
To replace the Fan Tray Assembly, follow these steps:
Step 1 Slide the replacement fan into the SES chassis; make sure to get the upper left edge of the Fan Tray Assembly over the small standoff on the upper left wall of the card cage in the fan slot.
Step 2 Carefully press it until the plug on the rear of the Fan Tray Assembly mates with the connector on the backplane of the SES.
Step 3 Tighten the captive screw securing the fan to the SES chassis.
There can be up to two 1200 Watt AC Power Supply Modules installed in the AC Power Supply Tray. The optional AC Power Supply Tray is factory installed. Each AC Power Supply Module has its own Enable (On/Off) switch, connectors, and status LEDs. The AC Power Supply Modules are independent of one another, and one can be replaced while the other powers the SES.
Figure 3-3 illustrated a rear view of an AC Power Supply Module. Figure 3-4 illustrates the rear panel of an SES with two AC Power Supply Modules installed. There is a captive nut on the flange on the top of the rear panel of each AC Power Supply Module used to secure the AC Power Supply Modules to the AC Power Supply Tray and the SES chassis, once they are installed.
After determining that an AC power supply is faulty -- the front panel AC LED is on, but the DC LED is off -- follow these steps to remove and replace it:
Step 1 Turn off the Enable (On/Off) switch on the appropriate AC Power Supply Module.
Step 2 Turn off power at the AC source for the appropriate AC Power Supply Module.
Step 3 At the rear of the SES, disconnect the AC power cord from the AC input of the appropriate AC Power Supply Module.
Step 4 Disconnect DC power cable -- the special cable from the AC Power Supply Module with the fixture that fits in the DC PEM slot and connects to the SES backplane -- from the appropriate AC Power Supply Module.
| Caution If there are two AC Power Supply Modules installed in your system, some of the pins on the DC power cable connector which you just removed from the AC Power Supply Module will have live DC voltage on them. Be careful to keep the this connector from coming in contact with conducting parts of the SES chassis or rack. |
Step 5 Loosen the set screw at the top of the AC Power Supply Module that secures it to the AC Power Supply Tray.
Step 6 Pull AC Power Supply Module out.
Step 7 Insert the new AC Power Supply Module.
Step 8 Tighten the set screw at the top of the AC Power Supply Module.
Step 9 Reattach the DC power cable.
Step 10 Reattach the AC power input cable.
Step 11 Turn the AC source power on.
Step 12 Turn the Enable switch on the AC Power Module to On.
Step 13 From the front of the SES, verify that both LEDs (AC and DC) on the replacement AC Power Supply Module are lit.
There can be two DC PEMs located on the rear panel of an SES. Once you have determined that you need to remove and replace a DC PEM, shown in Figure 3-5, follow these steps:
Step 1 Turn off the DC source power.
Step 2 Turn off the switch on the DC PEM.
Step 3 Unplug the pluggable terminal block at TB1.
Step 4 Loosen the captive screws holding the DC PEM to the SES.
Step 5 Slide the DC PEM out of the SES.
To replace a DC PEM, follow these steps"
Step 1 Slide the DC PEM into its slot on the back of the SES.
Step 2 Secure the DC PEM to the SES with the two captive screws.
Step 3 Plug the pluggable terminal block back in at TB1.
Step 4 Turn on the DC PEM switch.
Step 5 Turn on the power at the DC source.
Step 6 Verify that the DC PEM LED is lit.
Removing and Replacing Processor and Service Modules is covered in Chapter 2 in the section, "Installing Processor and Service Modules." Those procedures include instructions for both frontcards and backcards.
The SES is typically configured at the factory as you ordered it. Unused card slots are configured for single-height modules and covered with blank faceplates.
Single-height service module slots 3 - 7 and 10 - 14 can be converted into slots for a double-height by removing the center divider module. Note that these slots have to be converted from bottom to top, that is, slot 3 has to be converted before you convert slot 4. Figure 3-6 illustrates the slot numbering of an SES with slots 3 configured for a double-height module.
Be aware of the following before you convert the slots:
| Caution You can convert single-height card slots to double-height when there is powered applied to the SES. Install the center guide module only in the center of the card slot where there is a guide which it fits over and slides on. The guide is on the top of the card slot in the middle. Make sure never to slide the center guide module into the backplane connectors. |
Figure 3-7 illustrates a center guide module, and Figure 3-8 shows the location of center guide modules in an SES chassis.
To convert a slot, follow these steps:
Step 1 Delete all the connections, and down all the ports, lines, and trunks on the single-height slots which your are converting, if applicable.
Step 2 Remove the cabling from the back cards (unless they are the correct back cards for the double-height card), then remove the back card.
Step 3 Remove the front cards in both single-height slots, if applicable.
Step 4 Repeat steps 3 and 4 for every slot you are going to convert.
Step 5 Insert a screw driver and loosen the long screw that holds in the center guide module.
Step 6 Remove the center guide module.
Step 7 Install the double-height front card and associated back cards as needed.
Install a blank faceplate where you do not fill a double-height slot with a double-height card. (Likewise, where you do not install a back card, you must install a blank single-height faceplate.)
To replace a slot divider center guide, follow these steps:
Step 1 Locate and prepare the empty slot in which you are going to install the center guide.
Step 2 Note the position for the center guide in marked by an indentation on the bottom panel of the card slot, and there is a guide for the slot fixed to the top panel of the card slot.
Step 3 Slide the guide into the card slot, making sure that it rides on the guide fixed to the top panel.
| Caution Install the center guide module only in the center of the card slot where there is a guide which it fits over and slides on. The guide is on the top of the card slot in the middle. Make sure never to slide the center guide module into the backplane connectors. |
Step 4 When the guide is all the way in position, insert a screw driver in the hole in the center guide and tighten the long screw.
When reconverting slots to single height, start at the top and go down.
The SES has fuses in the backplane to protect individual card slots. Backplane fuses on the SES rarely, if ever, need replacement. These fuses, which are shown in Figure 3-9, are accessed from the rear of the card cage. They require a special tool for removal and replacement and should only be changed by certified field personnel.
Backplane fuses are intended to prevent catastrophic damage to the backplane in the event of accidental shorting of -48 VDC on the backplane to chassis ground. This type of event could be caused by bent backplane pins, contact of conductive elements (EMI Cans, EMI Gaskets, and so on) to power pins. These events would most likely happen during a factory build.
Because of design constraints, these fuses need to be in sockets on the backplane and are therefore not readily accessible. Cisco recommends that only factory-trained personnel do the procedure.
If a bad card slot is verified, call Cisco TAC. If a card with an open fuse is verified, return it to Cisco.
 | Warning Replacing a fuse requires only Cisco personnel using a special tool with the power off. |
Posted: Thu Mar 30 19:22:07 PST 2000
Copyright 1989 - 2000©Cisco Systems Inc.