Field Notice: FN - 64024 - ASR-920-PWR-A Might Fail to Start on Power Up - Replace on Failure

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Updated:October 20, 2021
Document ID:FN64024

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Notice

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.

Revision History

Revision Publish Date Comments
1.0
31-Aug-15
Initial Release
10.0
13-Oct-17
Migration to new field notice system
10.1
18-Jan-19
Fixed Broken Image Link
10.2
14-Oct-19
Updated the Problem Description and Workaround/Solution Sections and Removed the Upgrade Program Section
10.3
24-Oct-19
Updated the Workaround/Solution Section and Added the Upgrade Program Section
10.4
20-Oct-21
Updated the Workaround/Solution Section and Removed the Upgrade Program Section

Products Affected

Affected Product ID Comments
ASR-920-PWR-A=

Defect Information

Defect ID Headline
CSCvf34445 There were no defects filed with this field notice at the time of publication.

Problem Description

The Power Supply Unit ASR-920-PWR-A might fail to start up when it is powered on, which causes the ASR 920 routers to not power up.

Background

Cisco has identified a component design issue in the Power Supply Unit ASR-920-PWR-A used in these ASR 920 routers: ASR-920-24SZ-M, ASR-920-24SZ-IM, and ASR-920-24TZ-M.

The root cause has been identified as an auxiliary transformer that causes high overshoot and triggers the Logical Link Controller (LLC) Overvoltage Protection (OVP) (20V) when the Power Supply Unit starts up. This might cause the ASR 920 routers to not power up in the power cycle.

Problem Symptom

The ASR920 router might not power up in the power cycle or a single Power Supply Unit (the ASR-920-PWR-A) in the redundant setup might fail to power up.

Workaround/Solution

Cisco recommends replacement of the power supply for this issue, after confirmation of the impacted serial number and if the failure symptom matches the description in the Problem Symptom section.

How To Identify Affected Products

Enter the sh inventory command in the router prompt in order to identify the serial number on the ASR-920-PWR-A power supply. An example of the command output is shown here:

Use the Serial Number Validation tool for this notice to see if your serial number is impacted.

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

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