Forgot to copy the group, might help someone someday.
It's possible for a digital set to have a bad buzz saw noise
then in speakerphone if the shield can on the microphone
becomes disconnected from the ground wire to the circuit
board. The aluminum can is crimped to the small terminal
board and picks up ground from the board trace under the
crimp. The glue they applied over the solder joint prys
open the crimp and RF gets into the amplifiers. Carefully
remove all the glue from the board and the can makes contact
again, noise stops.
It is generally just one phone, but the client blows it up
to a general everything is broke ;-) If it really is on
everything, make sure the ksu has a good ground.
Troubleshoot where the noise is coming from. One thing at a
time.
-l
Jim Gottlieb wrote:
I've got a KX-TD816 fully equipped and the customer started reporting
static on outside calls. I'm on site now and my hope that it was a telco
problem has been dashed.
The loud static seems to come and go on nearly any analog connection.
Digital sets only get it when connected to analog lines (most sets are
digital, hence the initial report), but analog sets can get it at any
time.
On analog stations, sometimes you pick up and hear only static for
several
seconds, then it goes away and you get internal dial tone. Then the
static
may return. It doesn't seem to be isolated to any particular card,
station, or line.
While hearing the really bad static on a phone on an outside line, I
listened to that line on a butt set, and it was clean. Only the
internal user is hearing the static.
Any ideas?
Thanks...
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