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MX10004 Cooling System Maintenance

SUMMARY Maintaining the Juniper Networks MX10004 router includes removing and installing fan trays and the fan tray controller.

The MX10004 router has two independent, field-replaceable fan trays. The following topics describe how to install or remove a fan tray and the fan tray controller.

Install an MX10004 Fan Tray

Before you begin to install a fan tray in a Juniper Networks MX10004 router:

  • Review how to prevent ESD damage. See Prevention of Electrostatic Discharge Damage.

  • Ensure that you have the following parts and tools available to install a fan tray in an MX10004 router:

    • Electrostatic discharge (ESD) grounding strap

    • A Phillips (+) screwdriver (optional), number 1 or 2, for the captive screws

    • A replacement fan tray

CAUTION:

You can remove and replace one fan tray while the router is operating. Replace the fan tray as soon as possible to prevent thermal alarms and to prevent the chassis from overheating.

Each JNP10004-FAN2 fan tray is a hot-removable and hot-insertable field-replaceable unit (FRU). You can remove and replace the fan tray while the router is running without turning off power to the router or disrupting routing functions.

Each fan tray is installed vertically on the rear, or FRU side, of the chassis.

To install an MX10004 fan tray:

  1. Wrap and fasten one end of the ESD grounding strap around your bare wrist and connect the other end of the strap to one of the ESD points on the chassis (see Figure 1).
    Figure 1: ESD Point on the Rear of the MX10004 ESD Point on the Rear of the MX10004
      1
    —

    ESD point

    		 
  2. Grasp the top and bottom fan tray handles and align the fan tray so that it makes contact with the side wall.
  3. Push the fan tray into place until it is fully seated.
  4. Tighten the captive screws with the Phillips screwdriver, or hand tighten until the screws are tight. See Figure 2.
    Figure 2: Install the JNP10004-FAN2 Fan Tray in an MX10004 Install the JNP10004-FAN2 Fan Tray in an MX10004
  5. Set the fan speed to normal by using the test chassis fan tray 0 speed normal and test chassis fan tray 1 speed normal commands.

Remove an MX10004 Fan Tray

The Juniper Networks MX10004 router chassis has two independent, field-replaceable fan trays (JNP10004-FAN2). Each fan tray is a hot-removable and hot-insertable field-replaceable unit (FRU). You can remove and replace a single fan tray while the router is running without turning off power to the router or disrupting routing functions.

CAUTION:

Remove the fan tray only if you have a replacement fan tray available and ready to use.

If you remove a fan tray, you have a limited amount of time before the removal triggers a thermal alarm.

Before you remove a fan tray:

  • Review how to prevent ESD damage. See Prevention of Electrostatic Discharge Damage.

  • Ensure that you have the following parts and tools available to remove a fan tray from an MX10004:

    • Electrostatic discharge (ESD) grounding strap

    • Replacement fan tray

    • A Phillips (+) screwdriver (optional), number 1 or 2, for the captive screws

Note:

When replacing the fan trays or SFBs at 40° C chassis ambient temperature, ensure that the fans run at 100% fan speed for at least 10 minutes before replacing the fans or SFBs.

Use the test chassis fan tray 0 speed full-speed and test chassis fan tray 1 speed full-speed commands to set the chassis fans to 100% speed.

After replacing the fans or SFBs, set the fans to normal speed using the test chassis fan tray 0 speed normal and test chassis fan tray 1 speed normal command.

You install fan trays vertically on the rear of the chassis.

CAUTION:

You can replace one fan tray while the router is operating. However, if you remove both fan trays at the same time, you’ll trigger a thermal alarm and the system will shut down. See Figure 3.

To remove an MX10004 fan tray:

  1. Wrap and fasten one end of the ESD grounding strap around your bare wrist and connect the other end of the strap to one of the ESD points on the chassis (see Figure 1).
  2. Loosen the four captive screws either by hand or with a Phillips screwdriver.
  3. Grasp the top and bottom handles and pull the fan tray out about 3 in. (7.6 cm). See Figure 3.
    Figure 3: Remove an MX10004 Fan Tray Remove an MX10004 Fan Tray
  4. Tilt the top of the fan tray forward.
  5. Using both hands, lift the fan tray out of the slot and rest it on a flat surface with the handles to the side.

Install an MX10004 Fan Tray Controller

For each of the two fan trays, there is a JNP10004-FTC2 fan tray controller. Each controller is a hot-removable and hot-insertable field-replaceable unit (FRU); you can remove and replace one fan tray controller while the router is running without turning off power to the router or disrupting routing functions. See Figure 6.

Figure 4: JNP10004-FTC2 Fan Tray Controller JNP10004-FTC2 Fan Tray Controller
CAUTION:

Remove the fan tray controller only if you have a replacement controller available.

To install a fan tray controller, you must first remove the associated fan tray. With the fan tray removed, you can install the fan tray controller horizontally above the Switch Fabric Boards (SFBs) at the top of the chassis.

Before you install a fan tray controller:

  • Ensure that you have removed the associated fan tray and fan tray controller. See Figure 3 and Remove an MX10004 Fan Tray Controller.

  • Review how to prevent ESD damage. See Prevention of Electrostatic Discharge Damage.

  • Ensure that you have the following parts and tools available to install a fan tray controller in an MX10004:

    • Electrostatic discharge (ESD) grounding strap

    • Replacement fan tray controller (JNP10004-FTC2)

    • A Phillips (+) screwdriver, number 1, for the captive screws (optional)

To install a fan tray controller:

  1. Remove the replacement fan tray controller from the antistatic bag.
  2. Carefully slide the fan tray controller into the fan tray controller slot until it is flush with the mounting holes. See Figure 5.
    Figure 5: Install the MX10004 Fan Tray Controller Install the MX10004 Fan Tray Controller
  3. Tighten the captive screws for the fan tray controller by hand or with a Phillips screwdriver.
  4. Reinstall the fan tray. See Install an MX10004 Fan Tray.

Remove an MX10004 Fan Tray Controller

For each of the two fan trays, there is a JNP10004-FTC2 fan tray controller. Each fan tray controller is a hot-removable and hot-insertable field-replaceable unit (FRU); you can remove and replace one fan tray controller while the router is running without turning off power to the router or disrupting routing functions. See Figure 4.

Figure 6: JNP10004-FTC2 Fan Tray Controller JNP10004-FTC2 Fan Tray Controller
CAUTION:

Remove the fan tray controller only if you have a replacement controller available.

To access a fan tray controller, you must first remove the fan tray. With the fan tray removed, you can install the fan tray controller horizontally above the Switch Fabric boards (SFBs) at the top of the chassis.

Before you remove a fan tray controller:

  • Review how to prevent ESD damage. See Prevention of Electrostatic Discharge Damage.

  • Ensure that you have the following parts and tools available to remove a fan tray controller from an MX10004:

    • Electrostatic discharge (ESD) grounding strap

    • An electrostatic bag or an antistatic mat

    • Replacement fan tray controller

    • A Phillips (+) screwdriver (optional), number 1, for the captive screws

  1. Remove the fan tray. See Remove an MX10004 Fan Tray.
  2. Loosen the two captive screws on each side of the fan tray controller by hand or with a Phillips screwdriver.
  3. Grasp the fan tray controller and pull it straight out of the slot. See Figure 7.
    Figure 7: Remove the JNP10004-FTC2 Fan Tray Controller Remove the JNP10004-FTC2 Fan Tray Controller
  4. Place the fan tray controller in an antistatic bag or on an antistatic mat.