[Kenwood] TS950SDX gone dead

Sat Apr 25 05:00:37 EDT 2009

On the air again! A professional technician found a dead transitor (Q151) 
(2SA1204) in the trx chipboard X59-3680-00 in the control unit. The board 
was replaced, and the TS now works fine. Still it remains a puzzle what 
caused the resistor to go dead. It was certainly not the short I suggested 
in my first mail.
Thanks to those who have given me advice in this forum.
Peter
----- Original Message ----- 
From: "Peter Ravn" <fasan5 at privat.dk>
To: <Kenwood at mailman.qth.net>
Sent: Friday, April 17, 2009 5:41 PM
Subject: [Kenwood] TS950SDX gone dead
> After a check for hum on the audio my TS950SDX has gone dead. The power 
> supply works, and so do the fans and all lights, but the TS can't receive 
> nor transmit. The S-meter peaks the scale, and the sound level is low 
> regardless the position of the RF control.
>>>> The problem is possibly due to a short circuit during the check when I 
> removed the subchassis and unplugged the two connectors, RX ANT OUT 
> terminal (3) and DRIVE IN terminal (4). With power on, the drive in 
> terminal connector happened to touch the rear panel for a few seconds, 
> immediately producing a light smoke and a hissing sound behind the left 
> side of the front panel, possibly from the SIGNAL UNIT board. When the two 
> connectors were replugged, and power was switched on again, the TS had 
> gone dead, and the smoke had disappeared.
>>>> So far no burnt resistor, capacitor or chip has been found. Resetting the 
> microprocessor has given no result.
>>>> Any clue?
>>>> Thanks a lot.
>>>> 73 de OZ8CTH
>> Peter
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