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Kenwood TK-690H & TK-790 Dual Head, Dual Deck Issue

Thread starter KC0BNS
Start date Nov 30, 2020

Status: Not open for further replies.

KC0BNS

Newbie

Nov 30, 2020

Good afternoon all, I have been tinkering with a new to me TK-690h/790 dual radio, dual head set-up that came out of a ambulance. I was told it was working fine at the time of removal. Just to make sure before I spent too much time programing the radio I hooked up both decks and both heads to make sure everything would power up. With everything connected via the KRK-8DBH kit, the radios turn on but both displays just flash with all characters illuminated.

With either Head 1 unplugged, or Head 2 unplugged the radio will boot up just fine. But with both connected it just sits in it's startup with the screen on and the backlight pulsing on and off. I swapped the heads from 1 to 2 and tried swapping the KC-22 control cables none would resolve the issue.

Currently using a Kenwood PS-30 power supply to power the radios.

Looking for Ideas as where to head next.

Thanks for taking the time.