Hi, I have a KENWOOD TS440S Tranceiver and it will not transmit, I can't hear the relay clicking over when I press the PPT. Could you please give me some ide of what could be wrong. Thanking you Tony Webster (G4FZF)
have not had a look inside as yet.
Hi, I’m a moderator for this topic and I wonder whether you’re still waiting for an answer. If you are, please let me know and I will do my best to find a Professional to assist you right away. If not, feel free to let me know and I will cancel this question for you. Thank you!
Hi, Yes I am still waiting for an answer to my problem
Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, a possibility to consider is an issue with the mic's PTT switch, the mic cord and/or a cold solder at the mic connector. Has another mic been tried? Has the SEND / REC button been tried?If not a mic problem, then it would be an internal hardware issue. The unit would have to be opened up for visual inspection, voltage measurements, confirm fault and effect repairs.Are you then considering a DIY (do-it-yourself) repair approach? Are you familiar with electronic components, have access to / comfortable in the use of a multimeter and perhaps even a soldering iron/hot-air station? Equally important, could you make use of the repair / Service Manual?Please post back how you would want to approach this and/or should you need additional information. 41084.6165286227
Hi , Yes I am a retired Electronics engineer (76) TV I have a soldering iron, Digital test meter etc. I have checked the Mic Ptt and it is working Ok plus the solder joints are good on the plug. I do not have a service manual only a user manual.
Great on the DIY!and has the SEND/REC button been tried?An electronic copy of the Service Manual would be sent to your email through the kindness of a moderator. May not be that immediate though.The Service Manual is in pdf format and would require Adobe Acrobat Reader or equivalent.Of particular interest would be p. 79 showing the schematics of the IF Unit X60-1300-00. Check pin 1 (SS/13) of J27 for PTT action.
Hi Thank you for the reply, and yes I have tried the Send/Rec button with the same outcome as the PTT. Thank you for the manual when I get it I will have a look at Pin 1 of the J27. Do you know what the voltage should be? Regards Tony (G$FZF)
Pin 1 would be ~ 5V on RX and go down to 0V when PTT is engaged.If I may ask, are all other functions normal (except the PTT/SEND)?
Hi, Yes all the other functions are ok
Copy that.Please post back when the Service Manual has been downloaded.