[Kenwood] TS-440S/AT Problem

Tue, 6 Apr 2004 07:04:53 -0500

It's not self-repairing. It's called drying out. The potting compound used
in some of the VCO's after it dries out absorbs moisture. That causes the
VCO to malfunction. Leaving the radio on generates enough heat to dry it
out. The longer it is on the less time it takes to dry out each time.

Clif Holland, KA5IPF
AVVid
Authorized Kenwood and Icom Service Center
816 W Shady Grove Rd
Irving, TX 75060

www.avvid.com

1-800-214-5779
972-870-0630 (Local)
----- Original Message ----- 
From: "Bill Stewart" <[email protected]>
To: "[email protected]" <[email protected]>
Sent: Monday, April 05, 2004 1:46 PM
Subject: [Kenwood] TS-440S/AT Problem

I have a TS-440S with Ant. Tuner which I purchased new in Nov. '89. It was
working fine one night a few weeks ago. The next morning I turned it on and
heard in the receiver, a noise which sounded like a motorboating  or an
ignition noise source (similar to a 1955 Ford pickup, for those that can
remember that far back) under the antenna. This noise was across all bands
and was louder where there were signals or band noise. Sigs were masked by
the noise and unreadable. I also noticed the antenna tuner would not stop
searching for a match where it had a match the night before. Also when
transmitting the power was very low and the resulting transmitted signal
sounded like the noise heard when in the receive mode. I fiddled with the
rig most of day and noticed that after a few hours, it went back to normal.
Over the next few days, after gradually shorter warm-up  times...down to
about 10 mins.,  the radio would return to normal operation. Its been a
couple of weeks now and so far it is working normal with no warm-up
required. Has anyone had this problem and if so, what was the cause? It
didn't realize that Kenwood was advanced enough in 1989 to have
self-repairing circuits.

Thanks de Bill K4JYS

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