Receiver problem
 

I have a Sherwood A/V receiver. Its about 6 years old, give or take a
couple years. I'm having a problem with the center channel. I have it set
up to power three front speakers. The sound from the center seems to drop
out. It rises and falls on its own. A couple years ago I had to replace the
fuse inside (power surge) and now it is connected to a good quality surge
protector. So is the tv and everything else for that matter.

What if anything can I do to fix this sound problem? Thanks-

--
-Phil Marshall-
{remove 9 for mail}

In article , Phil Marshall
(Phil wrote:

I have a Sherwood A/V receiver. Its about 6 years old, give or take a
couple years. I'm having a problem with the center channel. I have it set
up to power three front speakers. The sound from the center seems to drop
out. It rises and falls on its own. A couple years ago I had to replace the
fuse inside (power surge) and now it is connected to a good quality surge
protector. So is the tv and everything else for that matter.

What if anything can I do to fix this sound problem? Thanks-

If there is a mechanical volume control in this unit, it is possible
that it is dirty and needs cleaning. To do this, open the cover and
spray a good contact or tuner cleaner into the small openings on the
volume control. But more likely, this thing uses IC chips for the
amplifier, and the IC chip for the center channel is going bad. These
chips are often hard to find (assuming they have not been discontinued
in the mean time) and are expensive. But if you can find one, a skilled
do-it-yourselfer can change them out. It would be handy to have a
scope and replicate this problem on the test bench. You need to know
for sure that the audio is solid going into the IC chip when the
problem happens. If not, your problem is somewhere else in the
receiver, and likely will take a rather high level of skill to track
it down and fix.

-john-

--
================================================== ==================
John A. Weeks III 952-432-2708
Newave Communications http://www.johnweeks.com
================================================== ==================

"John A. Weeks III" wrote:
In article , Phil Marshall
(Phil wrote:

I have a Sherwood A/V receiver. Its about 6 years old, give or take a
couple years. I'm having a problem with the center channel. I have it
set up to power three front speakers. The sound from the center seems
to drop out. It rises and falls on its own. A couple years ago I had to
replace the fuse inside (power surge) and now it is connected to a good
quality surge protector. So is the tv and everything else for that
matter.

What if anything can I do to fix this sound problem? Thanks-

If there is a mechanical volume control in this unit, it is possible
that it is dirty and needs cleaning. To do this, open the cover and
spray a good contact or tuner cleaner into the small openings on the
volume control. But more likely, this thing uses IC chips for the
amplifier, and the IC chip for the center channel is going bad. These
chips are often hard to find (assuming they have not been discontinued
in the mean time) and are expensive. But if you can find one, a skilled
do-it-yourselfer can change them out. It would be handy to have a
scope and replicate this problem on the test bench. You need to know
for sure that the audio is solid going into the IC chip when the
problem happens. If not, your problem is somewhere else in the
receiver, and likely will take a rather high level of skill to track
it down and fix.

-john-

Thanks for the reply. FWIW I have the volume knob (control) set at the half
way point. It doesn't get changed. I have my system set up so that I can
control the volume on the tv via the tv's remote. (tv audio signal out to
the receiver.)

--
-Phil Marshall-
{remove 9 for mail}

if the knob is just a potentiometer, the fact that you never change it just
adds to the possibility that its not making a good connection. moving it
around a bit helps keep it cleaner.

randy


Thanks for the reply. FWIW I have the volume knob (control) set at the
half
way point. It doesn't get changed. I have my system set up so that I can
control the volume on the tv via the tv's remote. (tv audio signal out to
the receiver.)

--
-Phil Marshall-
{remove 9 for mail}