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TK-790 Very Low Audio

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bl86

Member
Joined
Dec 19, 2002
Messages
22
Location
Greensboro, NC
Hello,

I got a used dash mount TK-790 that has almost no audio. With volume at full you can just barely hear anything however when I first power it up I get a very loud beep. All connections look good. I swapped control heads thinking maybe the speaker but it did the same thing. Also tried an external speaker off of pins 2 and 6 but audio was still very faint. Also tried another 3 pin to 6 pin jumper. Could it somehow be stuck in mute mode? I tried reprogramming it too and nothing.

Any other suggestions?

Also I noticed it had a small jumper wire on the main board going from RST (where top board connects to lower board) to NC (where the control head plugs into board). My other 790s don't have this jumper wire.

Thanks,

BL
 

bl86

Member
Joined
Dec 19, 2002
Messages
22
Location
Greensboro, NC
TK-790 Low & No Audio Solved

Well looks like I just found my own problem. Upon further investigating I found that this radio had a scrambler board in it but it was removed before I got the radio. Under the top cover I found when you install these scrambler boards you also must remove 0 ohm resistors R515 and R604 so that the TX and RX pass through the scrambler. Replacing R604 got the audio going and I assume R515 is for the TX side. Guess the ole 790 was cheap for a reason but a pretty easy fix except for the tight area to solder back in.

BL
 
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