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Kenwood TK 8180 power on problem

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Jingoes

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Mar 7, 2017
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Hi all,
am having a problem with my Kenwood TK8180. Had it running yesterday and all was fine. When I went to turn it on today and it lights up the LCD for a second then shuts down making a slight crack in the speaker. Was wondering if anyone can give me suggestions on what could be going wrong. Am using a good power supply, and have a new antenna which works fine on my GME.
Thanks
Jingoes.
 

FKimble

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Jul 14, 2014
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I'd double check all the power connections end to end, especially fuse holder. Antenna has nothing to do with it powering on.

Frank
 

Jingoes

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Thanks Frank took top off the radio and checked the voltage at the input on circuit board and it measured the 13.8 v out put of the power supply. Measuring the voltage while pushing on switch gave virtually no voltage drop. The radio came on at one stage but would not restart once turned off again. Has me stummped why it switches off straight away after powering on.
 

KK6ZTE

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Mar 27, 2016
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Thanks Frank took top off the radio and checked the voltage at the input on circuit board and it measured the 13.8 v out put of the power supply. Measuring the voltage while pushing on switch gave virtually no voltage drop. The radio came on at one stage but would not restart once turned off again. Has me stummped why it switches off straight away after powering on.
Had one that had a bad ribbon cable to front head that shorted power supply to ground.

Check fuses F401 and F801.

John
 

cmdrwill

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Are you disconnecting DC power completely? Some radios are designed to have main DC on all the time and turn on and off thru Ignition control wire. Some radios will not turn on if both DC sources are switched.
 

Jingoes

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Mar 7, 2017
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Had a look at all the fuses and checked the ribbon to the front control panel, It's a very odd situation, The only thing I can now think of is the small 3volt rechargeable battery just above the connector that joins the ribbon to the control panel. This battery no longer produces 3volts only gets to 2.5volts . And when power is disconnected it looses power quite quickly .Not fully Shure what the purpose of this battery is but assume it may have something to do with memory storage. Tried the ignition sensor wire by connecting it and it also has no effect upon the situation. It is strange because when it first happened it actually came on a few times. But now it just gives a fast flash of the LCD display and a small crack in the speaker and then goes back to the off state. Thanks all for your suggestions they are much appreciated. Will keep at it because I hope it will end up being something reasonably simple.
 

mmckenna

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The small battery only powers the "real time clock" when the radio is not powered.
Kenwood part number is: W09-0971-05 listed as "lithium cell".

If the fuses check out, the cables are OK and it passes basic voltage checks, I'd send it in for repair. There's a lot of possibilities, but these things require the right tools to work on. An hour of bench time at a shop is cheaper than a new radio.
 
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