Cisco CGR 1240 User manual
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Cisco Systems, Inc. www.cisco.com
Replacing FRUs in a Spare CGR Chassis
This document describes how to replace the Field Replaceable Units (FRUs) in a chassis on the CGR1240 with a new
one in the event of a Return Material Authorization (RMA).
Before You Begin
You must have the following tools available before starting the procedure.
1/2-inch (13-mm) socket wrench to open and close the router chassis door
A Spudger pry tool, see Figure 1
https://www.ifixit.com/Store/Tools/Spudger/IF145-002-2
A torque driver capable of exerting 72-84 lbs-in, see Figure 2
Side cut pliers or an equivalent tool for cutting cable ties.
A #1 Phillips head screwdriver
A Strap Wrench, see Figure 3
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Replacing FRUs in a Spare CGR Chassis
High Level Description
Figure 1 Spudger pry tool
Figure 2 TBN Torque Wrench
Figure 3 Strap Wrench
High Level Description
These steps are explained in greater detail later on in this document.
1. Open the spare chassis. Open the console port and SD card slot. Do not power on router yet.
2. Power down the old chassis to be replaced. Physically disconnect the battery cable. Open the old chassis to be
replaced.
3. Swap out the Modules, N-Connectors, Antennas and Batteries - all with spare chassis still powered down. Do not
connect battery to the cable at this time.
4. Discard the SD card that you were previously using. The new SD card ships in the spare chassis.
5. Final Checks. Attach battery cable to battery, and power up the unit. Let system boot for approximately 20 minutes.
6. Close up the chassis.
7. Verify the device is not in rommon mode, but in IOS# where it is configurable.
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Replacing FRUs in a Spare CGR Chassis
Detailed Steps to Replace the Chassis
8. The new SD Card will come with images preloaded, but not with customer configurations. All configurations need
to be pre-configured based on the customer configuration to join the Field Network Director.
Detailed Steps to Replace the Chassis
Follow these steps to replace the chassis and return the router to use.
Step 1. Open the Door per Documented Bolt Sequence (New Chassis and Old
Chassis).
The router front door must be opened to access the old chassis and new chassis interior. The 6 captive M8 bolts, located
at the rim of the front of the router will need to be loosened alternatively with a 1/2-inch (13 mm) socket wrench. See
Figure 4. Refer to the recommended order of loosening the bolts in Figure 5.
1. Loosen the bolts until all the bolts can be wigged and pulled up with your fingers at ease. The bolts should remain
on the door of the new chassis for any planned operation activity.
2. After all 6 bolts are loose, carefully swing the door open on the left-side hinges.
Caution: The door gasket creates a seal when the door is closed, so the door might open suddenly when the last
bolt is loosened.
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Replacing FRUs in a Spare CGR Chassis
Detailed Steps to Replace the Chassis
Figure 4 Captive Bolt Detail
Figure 5 Recommended Order of Loosening Bolts
Step 2. Power down the router.
Disconnect the router from its power source.
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Replacing FRUs in a Spare CGR Chassis
Detailed Steps to Replace the Chassis
Step 3. Replacing the Modules, N-Connectors, & Antennas.
Cisco recommends you to remove and insert modules to corresponding slots from the old chassis to the new chassis
in the following order:
1. Slot 3 module
2. Slot 4 module
3. Slot 6 module
4. Slot 5 module
Please note that the sequence of steps below is per module. Before attempting to remove or install any modules, please
ensure that you have the tools mentioned in the Before You Begin section.
The RF cables are connected to the Antenna/N-connector ports and assigned to slots as detailed in Table 1.
The ports are shown in Figure 6 and Figure 7. For the antennas, please pay attention to the part numbers listed on the
bottom upon following the swapping sequence.
Table 1 Port Assignment Table for Slots 3 & 4
Antenna Ports 3456
Slot 3 4 N/A
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Replacing FRUs in a Spare CGR Chassis
Detailed Steps to Replace the Chassis
Figure 6 Router Faced Down
Figure 7 Router Faced Top
Removing and Replacing each module.
The steps for removing the module in the slots (1 by 1) of the old chassis and inserting into the new chassis are as follows:
1. Unplug the RF cable(s) from the antenna or N-connector with the spudger. The tool might need to be inserted at an
angle under the cable for easy removal.
56
87
Front of Router (Door)
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Replacing FRUs in a Spare CGR Chassis
Detailed Steps to Replace the Chassis
2. Remove the corresponding antenna or N-connector from the old chassis. The antennas can be removed with a strap
wrench or bare hands. The N-connector cap Figure 8 can be removed with bare hands. The N-connector (with the
threads as shown in Figure 9) can be removed from the head with the torque wrench at a torque between 6-7 lbs-ft.
3. Use the ½-inch (13mm) socket wrench to remove the appropriate plugs of the ports 3, 4, and/or 5 of the new
chassis. Refer to Table 1
Note: This step can be skipped when removing the modules from slots 5 & 6. For port 5, make sure to move the
10.5” cable away from the BBU cable before removing the MCX connector.
4. Insert the antenna and/or N-connector to the new (spare) chassis at the same locations. The same tools in step 2
will be used at any torque in between 6-7 lbs-ft. If necessary, refer to the Figure 6 and Figure 7.
5. Remove module from the appropriate slot of the old chassis. Use the #1 Phillips screwdriver to loosen the captive
screws next to the handles of the module. Cut zip tie from the handle of the module only if the RF cable is routed
from the back of the router (only applies to slot 5 & 6). Grip the module just enough to pull it out of the PCI connector
and the slot.
6. Remove the blank module from the corresponding slot of the new chassis.
7. Insert the old chassis module into the corresponding empty slot of the new chassis. Ensure that the slot is aligned
with the slot edge guide and seated completely in the PCI connector.
Note: Do not force module into slot, if required, wiggle module to till PCI-E connector aligns and engages.
8. Use the Phillips screwdriver to tighten the module screws. Apply a zip tie to the module handle (only for slot 5 & 6)
as shown in Figure 10. The zip ties on slots 3 & 4 do not need to be reapplied to the module handles unless it was
cut off during removal.
9. Snap the end of the RF cable to the antenna by using the spudger tool to guide the end of the antenna to the
appropriate antenna or N-connector port connector (only applies for ports 3, 4, and 5). Cable part number
37-1391-01 goes with the LTE Main and LTE Aux connectors for slot 3 and the LTE main connector for slot 6. Cable
part number 37-1380-01 goes only with the LTE Aux connector for slot 6.
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Replacing FRUs in a Spare CGR Chassis
Detailed Steps to Replace the Chassis
Figure 8 N-Connector Cap
Figure 9 N-Connector
Figure 10 Zip Tie Locations on Share Chassis
Step 4. Swapping Battery Back Up (BBUs) from Old to New Chassis
Before swapping the BBUs in the CGR 1240, Cisco recommends the following:
Best practice is to replace all of the BBUs.
Verify that all of the BBUs are the same version
Swapping out the BBUs requires the use of a #1 Phillips head screwdriver.
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Replacing FRUs in a Spare CGR Chassis
Detailed Steps to Replace the Chassis
Warning: Only trained and qualified personnel should be allowed to install, replace, or service this equipment.
To prevent ESD damage, follow these guidelines:
Always use an ESD wrist or ankle strap and ensure that it makes good skin contact
Connect the equipment end of the strap to an unfinished chassis surface
Place the BBU on an anti-static surface or in a static shielding bag.
Avoid contact between the battery and clothing
Do not remove the wrist strap until the installation is complete
Figure 11 Shows the front door open with 3 BBUs mounted in the door.
To swap the BBUs on the chassis door, perform the following:
1. Remove the outermost BBU by loosening the 6 screws at a torque of 8 lbs-in. Refer to Figure 12 for the proper order.
Note: Screws are captive type and do not come off of the BBU.
2. Unplug the BBU from the BBU stack. Please do not touch the torx screws.
3. Remove the 2nd and 3rd BBU by the same process as in Step 1.
4. Once the last BBU has been released from the cover, unplug the cable harness on the side of BBU. Refer to
Figure 13.
5. Install the last BBU into the new chassis by plugging in the cable harness, then attach the BBU to the cover and
tighten the 6 captive screws at a torque of 8 lbs-in. Refer to Figure 12 for the proper order.
6. Plug the 2nd BBU into the 1st one attached to the chassis, and tighten the 6 screws at the same torque as the first
BBU installed. Repeat this step for the final BBU. When plugging BBUs into each other, they are rotated 180 degrees
from each other.
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Replacing FRUs in a Spare CGR Chassis
Detailed Steps to Replace the Chassis
Figure 11 Battery Backup Units Mounted on Router Door
Figure 12 Sequence of Tightening and Loosening BBU Screws
Figure 13 Battery Cable Connection to BBU Connector
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