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Kenwood Tk-730 Accessory functions no longer work after blown fuse?

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Bw1332

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Joined
Jan 8, 2011
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CA
Hey everyone. I have a Kenwood TK-730 that was attached to a Touchmaster Delta, and was provided power from one of the accessory switches on the siren unit. The speaker option was selected on the kenwood for monitoring radio traffic outside of my vehicle. After returning to my vehicle, I used the siren's pa system, forgetting the speaker option was still on, and the fuse to the siren blew, cutting off power to the radio as well. After replacing the fuse multiple times, the fuses kept blowing every time the radio was turned on (I believe it was because the speaker for the siren is the same speaker used for the radio's external monitoring). I think it was because they were both trying to power the speaker, so there was a back draw. The siren still works perfect, however, the radio doesn't. The radio still powers on and all functions work, except the accessory plug. The external speaker for in car monitoring will not work, I can no longer use the PA or Speaker options on the radio. Any suggestions on what happened or how to fix it? Thank you in advanced.
 

ramal121

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Dec 5, 2008
Messages
1,636
Location
Sonoma, CA
The Unitrol has an input for radio rebroadcast and is transformer coupled. This is the only safe way to run speaker audio to the siren.

If you use a button on the Kenwood control head to switch to outside speaker then more than likely the radio was wired directly to the siren speaker. Bad idea. You were set up for the perfect storm and looks like it blew through.

With DC voltages in play on the speaker wires you must not ground them or apply an opposing voltage higher than what it can handle.

My first guess is you blew out the audio amp in the radio. Usually first to go. May have opened a trace also. Radio needs to go on the tech bench for troubleshooting.
 

Bw1332

Member
Joined
Jan 8, 2011
Messages
12
Location
CA
The Unitrol has an input for radio rebroadcast and is transformer coupled. This is the only safe way to run speaker audio to the siren.

If you use a button on the Kenwood control head to switch to outside speaker then more than likely the radio was wired directly to the siren speaker. Bad idea. You were set up for the perfect storm and looks like it blew through.

With DC voltages in play on the speaker wires you must not ground them or apply an opposing voltage higher than what it can handle.

My first guess is you blew out the audio amp in the radio. Usually first to go. May have opened a trace also. Radio needs to go on the tech bench for troubleshooting.
Do you know where the Audio amp is located on the circuit board. I wanted to see if it was something that I could fix. Thanks
 
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