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[EX] Switch will not power on if the uplink module connector is misaligned

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Article ID: KB10502 KB Last Updated: 23 Jul 2020Version: 4.0
Summary:

When the uplink module connector is not alligned properly with the motherboard connector the result could be a short of the power rail.  This short will prevent the power supply from coming online and the EX switch may not power up.

Symptoms:

When the EX switch is plugged in it will not power up.  

Solution:

One of the checkpoints is the uplink module.

With power disconnected pull out the uplink module and then connect the EX switch to a power source.  If the EX switch powers up and boots properly there is a potential problem with the uplink module.

Try the following:

  •   If you have a spare uplink module disconnect the EX switch and plug in the spare uplink module.  Connect the EX switch to a power source.  If the EX switch powers up and boots properly then inspect the suspect uplink module for bent pins.
  • Check the pins on the suspect uplink module.  If the pins are bent then straighten them out or reinsert into the EX switch when it is powered down.  If the EX Switch still does not power on then contact Juniper Support.

If the uplink module connector is not aligned with the motherboard connector, or if there are bent pins on the uplink module, this can result in a short circuit of the power rail which will prevent the power supply from powering on the device.

Modification History:
2020-07-17:‚Äč Article reviewed for accuracy; no changes required.
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