[Kenwood] Kenwood TM-733 DuoBander Abnormal Indication

[James Duffer]

Dear Marcel,

I recall your experience and the solution.  In my case there is no hiss, and 
no heat (this may because I leave it disconnected now)  I haven't left power 
applied because I don't want to aggravate the problem.

I think mine is doing something else, but I will eventually check the "turn 
on" transistor.  I have a manual, but haven't dug it up, or even opened the 
case yet.

Thanks for the info.
73
Jim, wd4air

>Dear Jim,
>
>Some days/weeks ago I've read something about a transistor.
>Maybe Clif can tell you more.
>
>Quote
>To Cliff of Avvid and all other interested parties,I wrote a while back
>about my 733 still being "on" even after being
>turned off. It was making hissing noises from the speaker and would get hot
>to
>the touch after about a half hour. I discovered that the reason it was
>getting hot was that the 440mhz side was transmitting at a random freq
>around 438mhz
>at low to mid power. Cliff suggested that a transistor in the turn on
>circuit of the main body might be shorted. Kudos to Cliff as that is 
>exactly
>what
>was wrong. For those of you interested it was Q233 (2SB-1302), a surface
>mount transistor mounted on the underside of the 440mhz TX-RX unit. This
>transistor apparently controls the B+ being applied to the 8 volt regulator
>and
>other circuits. Since it had shorted, voltage was being applied to a lot of
>the radio when it was supposed to be off. I replaced it and now have
>exorcised all
>demons from my 733. In looking at the schematic for my TM-732A I see that
>the
>same circuit is in that rig so if it happens to the 732 I'll be prepared.
>Thanks again, Cliff.
>Quote
>
>Something like this ??
>
>73 Marcel PE1NMS Holland.
>

>Subject: [Kenwood] Kenwood TM-733 DuoBander Abnormal Indication
>
>
>My TM-733 is very ill.  The unit will indicate -ON- in the LCD....before it
>is even turned on.  Immediately when power is applied the indicator
>indicates -ON-.  The power on switch does not do anything or at least it
>doesn't appear to do anything.  No receive, no other displays.  Does it
>require some sort of "reset"?  I have reseated the front panel several 
>times
>hoping that was the problem.....but no change noted.
>
>Any suggestions short of sending it off to the Kenwood Service Center?
>
>73, Jim, wd4air
>
>
>

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