Technical Documentation
Removing M320 Components from the Chassis
Removing the M320 Power Supplies
The power supplies are located at the rear of the chassis below the SIBs. Each power supply weighs approximately 10 lb (4.5 kg).
Remove the upper power supply first and finish with the lowest power supply. To remove the AC or DC power supplies:
- 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.
- Switch the circuit breaker on the power supply faceplate to the off position (O). We recommend this even though the power supplies are not connected to power sources.
- Loosen the captive screw on each side of the power supply faceplate completely.
- Grasp the flange on each side of the power supply faceplate, placing your hand between the flange and the chassis.
- Pull firmly to start removing the power supply. Slide it halfway out of the chassis (see Figure 1, which shows the removal of DC power supplies).
- Place one hand underneath the power supply to support
it, and slide it completely out of the chassis.
Caution: Each power supply weighs approximately 10 lb (4.5 kg). Be prepared to support the full weight of the power supply as you remove it from the router.
- Repeat the procedure for each of the remaining power supplies.
Figure 1: Removing a Power Supply Before Installing the Router
Removing the M320 SIBs
Two to four SIBs are installed in the router. The SIBs are located in the rear of the chassis in the slots marked SIB0 through SIB3. SIBs are hot-insertable and hot-removable. Each SIB weighs approximately 4 lb (1.8 kg).
To remove a SIB (see Figure 2):
- Place an electrostatic bag or antistatic mat on a flat, stable surface.
- 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.
- Loosen the captive screws (using a Phillips (+) screwdriver, number 2) on the ejector handles on each side of the SIB faceplate.
- Flip the ejector handles outward to unseat the SIB.
- Grasp both ejector handles, pull firmly, and slide the SIB about three-quarters of the way out of the chassis.
- Place one hand underneath the SIB 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.
Figure 2: Removing a SIB
Removing the M320 CBs
The router can have one or two CBs. They are located in the upper rear of the chassis in the slots marked CB0 and CB1. Each CB weighs approximately 3.4 lb (1.5 kg).
To remove the CBs (see Figure 3):
- Place an electrostatic bag or antistatic mat on a flat, stable surface.
- 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.
- Loosen the captive screws on the ejector handles on both sides of the CB faceplate.
- Flip the ejector handles outward to unseat the CB.
- Grasp the ejector handles, and slide the CB about halfway out of the chassis.
- Place one hand underneath the CB 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.
- Repeat the procedure for the second CB.
Figure 3: Removing a CB
Removing the M320 Rear Fan Tray
The rear fan tray is mounted vertically on the right side of the rear of the chassis. The rear fan tray contains seven fans. The fan tray weighs about 8.4 lb (3.8 kg).
| Caution: To maintain proper cooling, do not operate the router with the rear fan tray removed for more than 1 minute. |
To remove the rear fan tray (see Figure 4):
- 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.
- Loosen the captive screws on the top and bottom of the fan tray faceplate, using a Phillips (+) screwdriver, number 2.
- Grasp the handle and pull the fan tray halfway out of the chassis.
- When the fans stop spinning, place one hand under the fan tray to support it, and pull the fan tray completely out of the chassis.
Figure 4: Removing the Rear Fan Tray
Removing the M320 Cable Management System
The cable management system is located below the FPC card cage. The cable management system weighs approximately 5 lb (2.3 kg).
To remove the cable management system (see Figure 5):
- 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.
- Using a 3/8-in. nut driver, unscrew the nuts on the corners of the cable management system.
- Grasp the bottom of the cable management system and pull it straight out from the studs on the front of the chassis.
Figure 5: Removing the Cable Management System
Removing the M320 Front Fan Trays
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 fan tray weighs about 11 lb (5.1 kg).
To remove the front fan trays (see Figure 6):
- 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.
- Loosen the captive screw on each side of the faceplate of one of the fan trays.
- Grasp the handles and pull the fan tray until it stops.
- Press the tabs on both sides of the fan tray and pull the fan tray halfway out of the chassis.
- Place one hand under the fan tray to support it, and pull the fan tray completely out of the chassis.
- Repeat the procedure to remove the remaining front fan tray.
Figure 6: Removing a Front Fan Tray
Removing the M320 FPCs
The router holds up to eight FPCs, which are installed vertically in the front of the router. The FPCs are hot-insertable and hot-removable. An empty FPC1 or FPC2 weighs 15 lb (6.8 kg), and an empty FPC3 weighs 16 lb (7.3 kg). A fully configured FPC can weigh up to 29 lb (13.2 kg)
Each FPC slot not occupied by an FPC must be covered by an FPC blank panel. An FPC blank panel weighs 7.7 lb (3.5 kg).
To remove an FPC (see Figure 7):
- Place an electrostatic bag or antistatic mat on a flat, stable surface.
- 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.
- Before removing the FPCs, record their location in the chassis so that you can reinstall each FPC in the correct slot
- Simultaneously turn both the ejector handles counterclockwise to unseat the FPC.
- Grasp the handles and slide the FPC straight out of the card cage halfway.
- 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 29 lb (13.2 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, bus bars, 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.
- Repeat the procedure for each remaining FPC.
Figure 7: Removing an FPC
