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Kenwood Forum For discussion of land mobile radio products manufactured by Kenwood. This is to include the TK(R) and NX(R) series radios and their associated accessories. This forum is not for the TM series; use Amateur Radio Equipment.

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Old 12-11-2013, 8:28 AM
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Default TK-630 drawing current when off.

I have a TK-630 in our front end loader at work. I have the radio wired for ignition sense, but here lately it decided it was going to keep drawing current, even with the keyed switch in the off position. I'm sure something has gone awry inside the radio, just need to know which direction to look.
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Old 12-11-2013, 8:23 PM
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Default Re: TK-630 drawing current when off.

How much current you talking about?

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Old 12-12-2013, 1:17 PM
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Wirelessly posted (Opera/9.80 (Android 2.3.4; Linux; Opera Mobi/ADR-1309251116) Presto/2.11.355 Version/12.10)

Being set for ignition sense, means that part of the radio is still on, and will draw current.
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Old 12-12-2013, 3:07 PM
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Quote:
Originally Posted by discombobulated View Post
How much current you talking about?

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Enough to drain the battery if it sits over the weekend.
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Old 12-12-2013, 7:10 PM
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Default Re: TK-630 drawing current when off.

Krokus is pretty much right. On the 630 I always wire a relay to a switch or ignition instead of using the ignition sense.

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Old 12-13-2013, 6:54 AM
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Quote:
Originally Posted by discombobulated View Post
Krokus is pretty much right. On the 630 I always wire a relay to a switch or ignition instead of using the ignition sense.

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Ok, I'll wire it up that way. But I thought that was the purpose of ignition sense, so you wouldn't have to do that? It's strange that it started killing the batteries here lately, I've had it wired for ignition sense for quite some time. The batteries were replaced this past summer too.
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Old 12-14-2013, 6:21 AM
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Default Re: TK-630 drawing current when off.

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Originally Posted by NZ0J View Post
Ok, I'll wire it up that way. But I thought that was the purpose of ignition sense, so you wouldn't have to do that? It's strange that it started killing the batteries here lately, I've had it wired for ignition sense for quite some time. The batteries were replaced this past summer too.
If the radios have been wired that way for awhile, and the drain is a new issue, then the radios are not the (only) problem. The power draw when the radio is "off" should be rather small, without knowing the specs, I would guess a few tenths of an amp.

What is new to the vehicles? New GPS? Data terminals or laptops? Are the vehicles no longer kept on shore power or a battery tender? Different style or size of battery? Different driving habits, maybe consisting of short trips?


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Old 12-14-2013, 7:50 AM
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If you totally power the radio down, it will lose the last settings memory (volume setting, current channel, panel brightness).. If you remove the fuse from the ign sense line, does the battery hold a charge?
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Old 12-15-2013, 3:14 PM
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The radio is most certainly the culprit. It is drawing more than normal when the radio is shut off, and wired for ignition sense. The vehicle in question is a Caterpillar 962G end loader. With the loader shut off, there is a major draw on the batteries, if I disconnect the radio, the draw is gone. The batteries are good, fairly new even. Nothing else has been added to the vehicle.
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Old 12-15-2013, 3:39 PM
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630's are old enough that I'd start looking at capacitors going bad. Not having a schematic in front of me, I don't know what sort of components are in the path of the power input that could crap out and do this. The other thing I'd look at, considering it's usage, would be dust, corrosion, or just some water intrusion into the radio.

Have you opened it up to take a look? Someone been washing out the inside of the cab with a pressure washer? Has vibration cause the circuit board to work lose, components to come lose, etc? Probably the first thing I'd do would be to open it up and do a visual inspection.
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Old 12-15-2013, 6:37 PM
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Default Re: TK-630 drawing current when off.

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630's are old enough that I'd start looking at capacitors going bad. Not having a schematic in front of me, I don't know what sort of components are in the path of the power input that could crap out and do this. The other thing I'd look at, considering it's usage, would be dust, corrosion, or just some water intrusion into the radio.

Have you opened it up to take a look? Someone been washing out the inside of the cab with a pressure washer? Has vibration cause the circuit board to work lose, components to come lose, etc? Probably the first thing I'd do would be to open it up and do a visual inspection.
No water in it, but vibration is a good possibility. It's not really a big deal for me to replace the radio, we have new Kenwoods and Motos on the shelf, I was must curious if it was something common with this model that I could easily fix. I may just grab a 6110 off the shelf and put it in.
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