Removing Components from the T640 Chassis

Removing the T640 Power Supplies

The power supplies are located at the rear of the chassis below the SIBs. Each two-input 160-A DC power supply weighs approximately 23 lb (10.5 kg). Each three-input 240-A DC power supply weighs approximately 25 lb (11.3 kg). Each four-input 240-A DC power supply weighs approximately 26.6 lb (12.0 kg). Each AC power supply weighs 31.0 lb (14.06 kg).

To remove the power supplies, starting with the upper power supply:

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to an approved site ESD grounding point. See the instructions for your site.
2. Switch the circuit breakers on the DC power supply faceplates to the off position (O) or the power switches on the AC power supply faceplates to the standby position. We recommend this even though the power supplies are not connected to power sources.
3. Loosen the captive screws on the lower corners of the power supply faceplate completely.
4. Twist the ejector handles on the upper corners of the faceplate counterclockwise to unseat the power supply.
5. Grasp the handle on the power supply faceplate and pull firmly to start removing the power supply. Slide it halfway out of the chassis (see Figure 1).

   Caution: Be prepared to support the full weight of the power supply as you remove it from the router.

6. Place one hand underneath the power supply to support it and slide it completely out of the chassis.
7. Repeat the procedure for the other power supply.

Note: Figure 1 shows the two-input 160-A DC power supply, but the procedure also applies to the three-input 240-A DC power supply.

Figure 1: Removing a Power Supply Before Installing the Router

Removing the T640 SIBs

Five standard SIBs, SIB version B, or T640-SIBs are installed in the router. The SIBs are located in the rear of the chassis in the slots marked SIB0 through SIB4. Each SIB weighs approximately 6.8 lb (3.1 kg).

To remove a SIB (see Figure 2):

1. Place an electrostatic bag or antistatic mat on a flat, stable surface.
2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to an approved site ESD grounding point. See the instructions for your site.
3. Loosen the captive screws (using a Phillips (+) screwdriver, number 2) on the ejector handles on each side of the SIB faceplate.
4. Flip the ejector handles outward to unseat the SIB.
5. Grasp both ejector handles, pull firmly, and slide the SIB about three-quarters of the way out of the chassis.
6. Place one hand underneath the SIB to support it and slide it completely out of the chassis. Place it on the antistatic mat.
7. Repeat the procedure for each of the remaining SIBs.

Figure 2: Removing a SIB

Removing the T640 Control Boards

The router can have up to two control boards. These are located in the upper rear of the chassis in the slots marked CB0 and CB1. Each one weighs approximately 5 lb (2.3 kg).

1. Place an electrostatic bag or antistatic mat on a flat, stable surface.
2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to an approved site ESD grounding point. See the instructions for your site.
3. Loosen the captive screws on the ejector handles on both sides of the control board faceplate.
4. Flip the ejector handles outward to unseat the control board.
5. Grasp the ejector handles and slide the control board about halfway out of the chassis.
6. Place one hand underneath the control board to support it and slide it completely out of the chassis. Place it on the antistatic mat.

   Caution: Do not stack hardware components on one another after you remove them. Place each component on an antistatic mat resting on a stable, flat surface.

7. Repeat the procedure for the second control board.

Figure 3: Removing a T-CB

Figure 4: Removing an LCC-CB

Removing the T640 SCGs

The router can have one or two SCGs installed. The SCGs are located in the upper rear of the chassis, above the control boards and Routing Engines. Each SCG weighs approximately 1.9 lb (0.9 kg).

To remove the SCGs (see Figure 5):

1. Place an electrostatic bag or antistatic mat on a flat, stable surface.
2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to an approved site ESD grounding point. See the instructions for your site.
3. Loosen the captive screws on the edges of the SCG faceplate.
4. Grasp the SCG by the handle on the faceplate, and slide it out of the chassis.
5. Place the SCG on the antistatic mat.
6. Repeat the procedure for the second SCG.

Figure 5: Removing an SCG

Removing the T640 Standard or Quiet Rear Fan Tray

Warning: Use this procedure only for routers that are powered.off.

The rear fan tray is mounted vertically on the right side of the rear of the chassis. Each standard or quiet rear fan tray weighs about 10 lb (4.5 kg).

To remove the rear fan tray (see Figure 6):

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to an approved site ESD grounding point. See the instructions for your site.
2. Loosen the captive screws on the top and bottom of the fan tray faceplate, using a Phillips (+) screwdriver, number 2.
3. Grasp the handles and pull the fan tray out of the chassis.

Figure 6: Removing the Rear Fan Tray

Removing the T640 Cable Management System

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to an approved site ESD grounding point. See the instructions for your site.
2. Using a 3/8-in. nut driver, unscrew the nuts on the corners of the cable management system.
3. Grasp the bottom of the cable management system and pull it straight out from the studs on the front of the chassis.

Removing the T640 Standard or Quiet Front Fan Trays

Warning: Use this procedure only for routers that are powered.off.

The upper front fan tray is located above the FPC card cage, and the lower front fan tray is located below the air filter. Each standard front fan tray weighs about 18.6 lb (8.4 kg). Each quiet front fan tray weighs about 17.8 lb (8.1 kg).

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to an approved site ESD grounding point. See the instructions for your site.
2. Loosen the captive screws on the corners of the faceplate of one of the fan trays.
3. Grasp the handles and pull the fan tray halfway out of the chassis.
4. Place one hand under the fan tray to support it and pull the fan tray completely out of the chassis.
5. Repeat the procedure to remove the remaining front fan tray.

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to an approved site ESD grounding point. See the instructions for your site.
2. Loosen the captive screws on the corners of the fan tray faceplate.
3. Grasp both sides of the fan tray, and pull the fan tray out of the chassis approximately 1 to 3 inches.
4. Press the two latches located on each side of the fan tray up to release the fan tray from the chassis.
5. Place one hand under the fan tray to support it and pull the fan tray completely out of the chassis.

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to an approved site ESD grounding point. See the instructions for your site.
2. Loosen the captive screws on the corners of the fan tray faceplate.
3. Grasp both sides of the fan tray, and pull the fan tray out of the chassis approximately 1 to 3 inches.
4. Press the two latches located on each side of the fan tray up to release the fan tray from the chassis.
5. Place one hand under the fan tray to support it and pull the fan tray completely out of the chassis.

Figure 7: Removing the Standard Upper Front Fan Tray

Figure 8: Removing the Quiet Upper Front Fan Tray

Removing the T640 FPCs

The router holds up to eight FPCs, which are installed vertically in the front of the router. An empty FPC weighs approximately 25 lb (11.3 kg) and a fully configured FPC can weigh up to 32 lb (14.5 kg).

To remove an FPC (see Figure 9):

1. Place an electrostatic bag or antistatic mat on a flat, stable surface.
2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to an approved site ESD grounding point. See the instructions for your site.
3. Before removing the FPCs, record their location in the chassis so that you can reinstall each FPC in the correct slot.
4. If you are removing a Type 2 FPC or Type 3 FPC, loosen the screws inside the ejector handles at the top and bottom of the FPC faceplate.
5. Simultaneously turn both the ejector handles counterclockwise to unseat the FPC.
6. Grasp the handles and slide the FPC straight out of the card cage halfway.
7. Place one hand around the front of the FPC (the PIC housing) and the other hand under it to support it. Slide the FPC completely out of the chassis, and place it on the antistatic mat or in the electrostatic bag.

   Caution: The weight of the FPC is concentrated in the back end. Be prepared to accept the full weight—up to 32 lb (14.5 kg)—as you slide the FPC out of the chassis. When the FPC is out of the chassis, do not hold it by the ejector handles or edge connectors. They cannot support its weight. Do not stack FPCs on top of one another after removal. Place each one individually in an electrostatic bag or on its own antistatic mat on a flat, stable surface.

8. Repeat the procedure for each remaining FPC.

Figure 9: Removing a T640 FPC