[cisco-voip] Re: 7940/60 phonesbreaking at the switchhook -- Different Problem

[Mike Armstrong]

I've seen this also.  We told the user to use the speakerphone until the
phone was replaced.  The switchhook apparatus is elegant and complex in a
Rube Goldberg sort of way, but the bottom line is that it doesn't work like
the good old 500 handset.  Lifting the phone allows a spring to flip,
which allows a plunger-like plastic (? - magnetic?) thingy to fall on a
small electronic module (that module also lights the MWI).  This looks like
some sort of proximity sensor, which probably tells a logical switch
somewhere in the bowels of the phone to go off-hook.  It's not all that
positive an action, so the little plunger might not plunge with enough
pressure to convince the proximity sensor of its proximity.

BTW, I just got e-mail back from TAC -- they've had a change of heart and
are going to RMA the phone.  I'm going to tell all our people to turn the
little tabs around to hide the hook so that this won't happen again (I
hope).

If anyone knows a source of repair parts (especially front case halves) for
these phones, please let me know.

mike

> Date: Mon, 10 Jan 2005 10:51:05 -0500
> From: "Dave Strzemienski \(Digiconasp\)"
> <david.strzemienski at digiconasp.com>
> Subject: [cisco-voip] 7940/60 phonesbreaking at the switchhook --
> Different Problem
> To: <cisco-voip at puck.nether.net>

> I haven't run across that one myself, but I *have* seen a number of
> 7940/60's in my shop fail at the on-hook switch, which results in the 
> phone
> remaining "on-hook" even when the receiver is lifted.  The spring-loaded
> part of the switch pops out as expected, but the internal portion of the
> switch seems to stick, when can result in a second or two delay in getting
> dialtone or answering a call.  Sometimes the switch remains stuck until 
> the
> user rapidly & repeatedly presses the button on the cradle.
>
> We've had about 12 phones fail in this manner.  We're a typical office
> setting with no unusual environmental factors, and as far as I know, the
> users aren't pouring their morning coffee into the phone cases.  Anyone 
> else
> seen this?
>
> -Dave Strzemienski