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
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.
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!
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....
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I have the same problem.
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.
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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