[Kenwood] Low audio volume on TS-940S

Sat Jun 11 09:18:15 EDT 2011

Hi Dave,
Glad your 940 is doing most things right. 
As you point out an external speaker test is good but one thing I would also
try is the headphone connection. If in theory the headphone jack is dirty or
not making good connection, it will kill or attenuate any speaker audio
output whether it is internal or external. I'd sure try that inserting and
removing the plug several times to see if something changes.
I can always look at my schematic and service manual but I would try what I
suggested first.
73, Roger, NJ2R
-----Original Message-----
From: kenwood-bounces at mailman.qth.net
[mailto:kenwood-bounces at mailman.qth.net] On Behalf Of Dr. David Kirkby
Sent: Saturday, June 11, 2011 8:54 AM
To: kenwood at mailman.qth.net
Subject: [Kenwood] Low audio volume on TS-940S
I've bought a TS-940S which seems to have a couple of problems - see my
other 
problem with the display blanking, as one or more VCOs loses lock.
After its warm, this rig does actually transmit and receive. However, the
audio 
volume on receive is very low. Even with both RF and AF gain controls to 
maximum, I can't hear any background noise on a dummy load. When I connect
an 
antenna, I can hear stations, but the audio volume appears to be very low.
The rig is not "deaf". A 50 uV signal from a signal generator indicates S9
and I 
can quite clearly hear a 1 uV signal from a sig gen. It seems as if the
audio 
stage(s) have low gain.
I have a struggle to hear the AM broadcast stations, despite the fact the
rig 
has the optional wide AM filter.
I've got the low-cut and high-cut controls in the correct position. If I
click 
the "GRAPH" button, it shows all segments on the LCD display. I can then
adjust 
the passband if I wish, which obviously reduces the audio level even
further.
Any ideas what this might be?
I've not yet tried the obvious thing and use an external speaker. I seem to
have 
mis-laid any suitable connectors I once had, but I can get one ordered. But
the 
speaker looks intact, so I very much doubt that's the problem.
Has anyone experienced this sort of issue before?
Dave
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