[Kenwood] TS940s HELP needed

Tue Jul 27 21:00:48 EDT 2004

John,
I have repaired a few TS-940 rigs but have not run into all of these symptoms,
at least not simultaneously in one rig. The first one sounds like a dirty
relay. I'm not sure about #2 but will give it some thought. As for #3, it
sounds like a loose connector or a loose wire.
Dino, KLØS/4, is probably on the right track. I, too, have fixed many
intermittents in a '940 by unplugging the connectors, applying DeOxit, and
reseating the connectors. From experience I would start with the connectors
under the speaker and all around it. Get a service manual if you don't have
one.
Good luck,
Ken, WA2LBI
wa2lbi at arrl.net
Quoting Cleeve <g3jvc at jcleeve.idps.co.uk>:
> I would appreciate any help and guidance with the problems I am experiencing
> with a late model TS940s. Having performed perfectly for a considerable time,
> the following faults appeared, in sequence, over a period of a week or so.
>> 	Fault 1. At switch on the receiver gain appeared low, but then, after about
> 30 seconds it came up to the normal level......this situation lasted for a
> couple of days, every time the rig was switched on.....then, the problem
> disappeared.
>> 	Fault 2. During Qsk operation on CW, whilst in the receive condition,
> tapping
> the rig cabinet, or gently thumping the desk brought the rig into the
> transmit
> mode ......then, again, after a couple of days, this problem disappeared.
>> 	Fault 3. Now, the output from the transmitter section will not achieve more
> than 50 - 60 watts, maximum into a Bird dummy load, the front panel power
> control being at "4 oclock" whereas the rig always provided 50 watts with the
> power control at "12 oclock" and 100 watts with the power control at "4
> oclock". The exception being that on 28 Mhz, the power output and power
> control are behaving normally. This problem is still ongoing.
>> 	My question to the group is, has anyone had a similar experience, do I have
> three faults, or are the faults described, symptomatic of a common cause ? I
> have looked through all the International Radio data sheets for the TS940s,
> but can find nothing which matches the symptoms. I would be most gratefull
> for
> any assistance to resolve this situation.....sincerely, John Cleeve. G3JVC.
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