Which Pins?

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36ian
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Which Pins?

Postby 36ian » 22 Sep 2016, 19:30

I have just bought a Kenwood TS770, it came without the power lead which is a four pin 'jones' type.

This radio will run from mains or 12V, my question is, which wire goes to which pin for 12V operation?

I'm planning to cobble together my own lead to get the radio 'on air' until the correct lead becomes available.

I've done the 'google' thing but info seems a bit thin on the ground, in a nutshell which pin does the +ive and -ive wires go to?

Any help would be greatly appreciated.

Thanks in advance

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Tigersaw
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Re: Which Pins?

Postby Tigersaw » 22 Sep 2016, 20:24

look here for the service manual;
https://www.yumpu.com/en/document/view/ ... ual-iw2nmx
fig 25 on page 9 shows a DC cable, looks like its + on pin 3, - on pin 4
but read it fully before making any decisions, I just had a quick google

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Re: Which Pins?

Postby Tim » 22 Sep 2016, 21:31

Make sure from the manual how the plug is wired, some of the 'Jones' type connections have all 4 pins wired, there are 2 pos and 2 neg and you will have a pair of both pos and neg wires going into one pos and one neg, the reason for this is that the RX is powered by one pair and the TX by the other pair. The plugs, or should I say sockets, are available from Technofix, you have to wire it yourself. There are some of these plugs available on eBay as well, type in 'jones 4 pin plug' and some should come up.

36ian
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Re: Which Pins?

Postby 36ian » 22 Sep 2016, 21:41

Tigersaw wrote:look here for the service manual;
https://www.yumpu.com/en/document/view/ ... ual-iw2nmx
fig 25 on page 9 shows a DC cable, looks like its + on pin 3, - on pin 4
but read it fully before making any decisions, I just had a quick google


Many thanks for the info, I read the drawing the same as you.

I will do a bit more homework to try and cross reference your findings before warming the iron up.

It will only give me more work if I get it wrong.

Cheers

Tim
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Re: Which Pins?

Postby Tim » 23 Sep 2016, 13:38

Make sure you measure up the pins on the radio before you buy anything, I just took delivery of some of these Jones plug/sockets for a Yaesu FT-707 and they are too small, so obviously they are not all a standard size and fitting.

36ian
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Re: Which Pins?

Postby 36ian » 15 Nov 2016, 18:44

Finally got around to sparking the 'old girl' up.
I was quite pleased when she sprung to life, unfortunately though all is not well.
There doesn't seem to be any RX or TX on either band although after persisting I can get a short burst of TX every now and then.
Anybody got any ideas?

http://imgur.com/a/GLAGn

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dt307
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Re: Which Pins?

Postby dt307 » 15 Nov 2016, 20:42

Get the switch cleaner out and
spray and work spray and work
esp the band selector and all the wafers if the first port of call I would do
Make sure all the controls are set correct Inc any on the back
163dt307-chris




“I fear the day that technology will surpass our human interaction. The world will have a generation of idiots.”
― Albert Einstein

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Re: Which Pins?

Postby DX-Digger » 15 Nov 2016, 21:38

If its been standing around a while the relay contacts could of oxidised, some of the older gear used to have relays that pushed into a base holder, so you could remove and clean the contacts.
Might be worth a look.
Or just leave as is and sell it for £30 or so
ʎɐqǝ uo pɹɐoqʎǝʞ ɐ ʎnq ı ǝɯıʇ ʇsɐן ǝɥʇ sı sıɥʇ

36ian
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Re: Which Pins?

Postby 36ian » 15 Nov 2016, 21:54

Thanks chaps, I'll order some switch cleaner and give that a go first.


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