[cisco-voip] Hookswitch problems on IP phones

[David Strzemienski]

The suggested "fix" from Cisco has never worked for me.

What has worked, however, is disassembling the 2 pieces of the phone shell
(front & back, should be 4 screws)

On the front half, where all of the electronics are attached, find the
hookswitch and remove it.  Underneath, there is a small white contact pad.
Lift the contact pad and clean the contacts underneath, which are probably
turning a gold-ish color, with an eraser until they are as silver as
possible.

 

Reassemble everything and you should be good to go.

 

Hope that helps

-Dave

  _____  

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Lelio Fulgenzi
Sent: Wednesday, August 31, 2005 4:28 PM
To: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Hookswitch problems on IP phones

 

 

http://www.cisco.com/warp/public/788/AVVID/hook_switch.html

 

in short,


Introduction 


A thorough analysis of a large number of Cisco IP Phones that have been
reported as hardware failures has been completed and our research reveals
that the great majority of these phones do not have any determinable
failure. The standard by which the phone industry measures phone failures is
based on Bell Corp/Telcordia standards and the standard acceptable failure
rate is set at 4 percent. The Cisco IP Phone's overall failure rate is well
under the acceptable industry average. Many of the problems that have been
reported as hardware failures are really either operational or cleanup
issues. This document describes some common troubleshoot steps to be taken
before you attempt to replace the Cisco IP Phone.


Self Cleaning Hookswitch Contacts 


The hookswitch contacts design uses a wipe action to self-clean the
contacts. Periods of nonuse of the phone allow air impurities such as dust
and other contaminants to hinder contact performance, which results in
intermittent operation. Press and release the hookswitch rapidly a dozen
times or so to clean the contacts.

If none of the solutions above remedy the situation, Return Material
Authorization (RMA) the phone.

 

----------------------------------------------------------------------------
----
Lelio Fulgenzi, B.A.
Network Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
"I had a coffee and Coke at lunch today...and now, I've got more jitter than
an
IP phone on a long haul 10base2 connection"
LFJ

----- Original Message ----- 

From: Mike <mailto:mfa at crec.ifas.ufl.edu>  Armstrong 

To: cisco-voip at puck.nether.net 

Sent: Wednesday, August 31, 2005 4:25 PM

Subject: [cisco-voip] Hookswitch problems on IP phones

 

We're starting to see problems with the hookswitches on 7910 and 7940 
phones.  First occurrence was a couple of weeks ago, now 2 more in the last 
week.  Is this a trend, I wonder?  (Phones are about 5 years old.)  Symptoms

are that when the phone is lifted off-hook, the switch only goes off-hook 
for a brief instant, then goes back on-hook.  The caller only hears a brief 
click followed by a dead line, and the callee gets a bum rap for hanging up 
on his callers.  One of my guys suspects the spring in there is weakening. 
Is anyone else seeing similar problems?

Mike Armstrong
UF/IFAS CREC
Lake Alfred, FL 

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