Cisco Unified IP Phone 7900 Series

February 19, 2007

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.

Products Affected

Problem Description

Misuse of the Cisco Unified Wireless IP Phone 7920 may result in damage and voiding of the warranty.

Background

The Cisco Unified Wireless IP Phone 7920 can be damaged by use of unauthorized "stick-on" belt clips.

The Cisco Unified Wireless IP Phone 7920 can be damaged by cleaning the device with anything except a dry, clean cloth.

Problem Symptoms

Use of an unauthorized "stick-on" belt clip may cause damage to the battery and may cause personal injury to the phone user.

The above picture shows an extreme case in which an unauthorized stick-on clip (labeled "Hook") caused the battery case to split open, resulting in the internal spring shorting out the internal battery leads. The spring developed enough heat to melt the plastic cover. If you are wearing the CP-7920 on your belt when the battery fails in this fashion, you may be burned.

Unauthorized cleaning procedures may result in a damaged Cisco Unified Wireless IP Phone.

The above image shows contamination on the cable that connects the 7920 LCD to the printed circuit board. The contamination was found to be a cleaning solution. The LCD failed to operate on this particular unit. However, the symptoms caused by use of cleaning solutions will vary depending on where the contaminant makes contact with the circuitry. Symptoms include, but are not limited to, inoperable keypad buttons, poor or no audio in the ear speaker, static and inability to authenticate to the Access Point.

Workaround/Solution

Solution:

Carrying the Cisco Unified Wireless IP Phone 7920:

In order to carry the Cisco Unified Wireless IP Phone 7920 on your belt, utilize the carrying cases available through Cisco Systems. The part numbers are:

In addition to the leather cases available from Cisco, there are silicon cases available from zCover and thermoformed heavy-duty polymer cases from System Wear.

zCover and System Wear are registered trademarks.

Cleaning the Cisco Unified Wireless IP Phone 7920:

Cisco recommends gently wiping the phone screen and phone with a soft, dry cloth. Do not use any moist wipes such as computer keyboard wipes, antibacterial moist wipes, germicidal wipes, and so on. Using anything other than a soft, dry cloth can contaminate phone components and cause failures.

Revision History

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:

• Open a service request on Cisco.com
• By email
• By telephone

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