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Kenwood ts-450s - cannot tune and no ptt

My Kenwood TS-450s gives a cw error code of "CHEC" when my AT-TUNE button is pressed. The atu won't activate and nothing happens when I depress my PTT. Fault occurred suddenly.

Regards
Doug

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  • onlytwo Sep 15, 2008

    I have the same problem.

  • wu3d Apr 24, 2009

    I left ham radio for a year. came back to my ts 450s and there is no audio. The radio will not key up in any mode. Please help me out as I need the rig for contesting. thank you.

  • don Feb 23, 2013

    My Knwd ts-450 s is still not transmitting. I couldnt find Q65. It recieves great but no tx. where exactly is this Q65 ?

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This is usually due to a stuck or shorted ptt line. I have repaired a couple of these and it was the same component each time. The packet TX transistor Q65 shorted causing the radio to power up in TX inhibit mode. Transistor Q65 is located on the underside of the IF board under the ACC 2 connector. This switching transistor is used only for tx (pin 9 of acc 2) and no other circuits depend on it. It can be removed completely if you don't mind not having ptt on acc 2.
This seems to be a common problem lately, I hope this helps you.

Posted on Aug 09, 2011

  • ct1fac Sep 05, 2011

    Hi, I have the same problem with my TS450, I removed Q65 from PCB, but the problem still there (no PTT)
    Any sugestion?? please help
    Thanks
    ct1fac

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I just had the same problem a few minutes ago and discovered that my desk mike's PTT was locked on. The manual says if you power up with the SEND button ON, transmit is inhibited, so powering up with the PTT engaged apparently produces the same result. This happened to me once before but I didn't know what I did to fix the problem. Whew!

Posted on Feb 16, 2009

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With this kind of problem i would suggest to send it to kenwood service center coz the is not easy,it needs a qualified technician....

Posted on May 09, 2008

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