From kc8jx at yahoo.com  Thu Nov 10 18:39:58 2016
From: kc8jx at yahoo.com (Larry Knapp)
Date: Thu, 10 Nov 2016 23:39:58 +0000 (UTC)
Subject: [Kenwood] TS940 Bank Controller II
In-Reply-To: <3ECE9B90-ED80-4BD6-863B-C9B86902495C@xzapx.com>
References: <3ECE9B90-ED80-4BD6-863B-C9B86902495C@xzapx.com>
Message-ID: <1797499394.1520491.1478821198430@mail.yahoo.com>

Corey - I don't know if you have received a reply to your query or not, but I have two questions for you relating to the 940.
I have heard there are two or perhaps 3 CR2032 batteries needed in the 940.? I do not have the bank controller in mine that I am aware of.? So two questions:1.? Are there two or three in a 940?? Mine is serial # 90701482.? Where did you get your batteries?
In a related question, I also have to replace at least one display blub (a grain of wheat I think it's called).? Have you replaced one yet and if so where did you get it?
Larry? KC8JX


      From: Corey Sukalich <zappy at xzapx.com>
 To: kenwood at mailman.qth.net 
 Sent: Saturday, October 29, 2016 3:51 PM
 Subject: [Kenwood] TS940 Bank Controller II
   
I recently replaced the batteries on my TS-940, which is now powering on again without complaint or strange characters on the sub display.

I wanted to check and see if anyone else on the list has a Bank Controller II by IRI (International Radio and Computers, Inc.) so that I can get more information about it.

It appears that this device ALSO has a backup battery installed, which I had not anticipated (bringing the total to 4 coin cells inside the transceiver).? The literature that came with the radio states it allows changing of the memory banks without opening the top lid and throwing the switch, while still permitting use of the voice display readout.? Pressing the button once increments the memory banks as it should, speaking the numbers 1-4 in succession.

Pressing quickly, twice, results in the unit reading the frequency on the display, and then a number indicating memory bank.? This does not function as the instruction sheet suggests, since it also seems to be incrementing the memory bank by one instead of leaving it where it was previously set.? I?m curious if anyone knows whether a bad battery on this unit may be causing this, or if there is another explanation for it.

I?ve reset the TS-940 completely by using the switch on the sub display and the A=B during power-on.? It appears everything else is working properly after my battery replacement aside this aftermarket unit.

Thanks for any information you may have.

-73-
Corey, N9WIV
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From j.searcy65 at gmail.com  Thu Nov 10 18:51:32 2016
From: j.searcy65 at gmail.com (James Searcy)
Date: Thu, 10 Nov 2016 17:51:32 -0600
Subject: [Kenwood] TS-520
Message-ID: <CAPvWwfqOZajSJW9Lxyz48AOo1tj3A9Js3XrDNcn9kB7eytM01Q@mail.gmail.com>

My Kenwood TS-520 has recently started doing something it has never done.
When keyed up (either by microphone or key) it will stay keyed up on its
own, when transistion to receive is attempted. Are there any ideas as to
the cause ???   Jim   WA5WRE

From stephoto at mind.net  Thu Nov 10 19:07:37 2016
From: stephoto at mind.net (Steve Sutfin)
Date: Thu, 10 Nov 2016 16:07:37 -0800
Subject: [Kenwood] TS-520
In-Reply-To: <CAPvWwfqOZajSJW9Lxyz48AOo1tj3A9Js3XrDNcn9kB7eytM01Q@mail.gmail.com>
References: <CAPvWwfqOZajSJW9Lxyz48AOo1tj3A9Js3XrDNcn9kB7eytM01Q@mail.gmail.com>
Message-ID: <42F67A61-C74F-40CF-9E68-60D2597D44B4@mind.net>

First thing that comes to mind is possibly something in the relay  
circuit. Either the voltage to it or the relay itself might be  
sticking. Do you have a service manual to check voltages?
Steve k7dna

On Nov 10, 2016, at 3:51 PM, James Searcy wrote:

> My Kenwood TS-520 has recently started doing something it has never  
> done.
> When keyed up (either by microphone or key) it will stay keyed up  
> on its
> own, when transistion to receive is attempted. Are there any ideas  
> as to
> the cause ???   Jim   WA5WRE
> ______________________________________________________________
> Kenwood mailing list
> Home: http://mailman.qth.net/mailman/listinfo/kenwood
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Kenwood at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html


From kgordon2006 at frontier.com  Thu Nov 10 19:32:12 2016
From: kgordon2006 at frontier.com (Kenneth G. Gordon)
Date: Thu, 10 Nov 2016 16:32:12 -0800
Subject: [Kenwood] TS-520
In-Reply-To: <42F67A61-C74F-40CF-9E68-60D2597D44B4@mind.net>
References: <CAPvWwfqOZajSJW9Lxyz48AOo1tj3A9Js3XrDNcn9kB7eytM01Q@mail.gmail.com>,
	<42F67A61-C74F-40CF-9E68-60D2597D44B4@mind.net>
Message-ID: <5825118C.709.1AD87E6@kgordon2006.frontier.com>

The TS-520 has a pair of 6146Bs in the final amp stage. In SOME transceivers, screen 
emission from old, gassy, or overloaded 6146Bs can cause the changeover relay to stick in 
the on condition until that voltage bleeds off.

Athough I doubt that that is an issue here, it might be something to think about.

Ken W7EKB

On 10 Nov 2016 at 16:07, Steve Sutfin wrote:

> First thing that comes to mind is possibly something in the relay  
> circuit. Either the voltage to it or the relay itself might be  
> sticking. Do you have a service manual to check voltages?
> Steve k7dna
> 
> On Nov 10, 2016, at 3:51 PM, James Searcy wrote:
> 
> > My Kenwood TS-520 has recently started doing something it has never  
> > done.
> > When keyed up (either by microphone or key) it will stay keyed up  
> > on its
> > own, when transistion to receive is attempted. Are there any ideas  
> > as to
> > the cause ???   Jim   WA5WRE
> > ______________________________________________________________
> > Kenwood mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/kenwood
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Kenwood at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> 
> ______________________________________________________________
> Kenwood mailing list
> Home: http://mailman.qth.net/mailman/listinfo/kenwood
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Kenwood at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html



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From kd5ckp at gmail.com  Fri Nov 11 15:07:43 2016
From: kd5ckp at gmail.com (Tim Billingsley)
Date: Fri, 11 Nov 2016 20:07:43 +0000
Subject: [Kenwood] ASTRON RS-35M
In-Reply-To: <CAG82UfATyMop6CpV-rtp48+u3rwFDRn7C28AKuPM=PDffP4SLA@mail.gmail.com>
References: <CAG82UfCCu1H++d8GiMd1LYO55s94gPPJxkGVWumVaavJqAdheg@mail.gmail.com>
	<CAG82UfDKLtfHcNt7EPbixT98fjvanpa_fPHh76rBqMUcU4==GQ@mail.gmail.com>
	<CAG82UfDzmdoojEzk+9dRNUh_QNua8MoO2qFu0TMV4cGHQ=ZwRg@mail.gmail.com>
	<CAG82UfBLsC1=wEgGtKr7VntQO-1Ff-n-E84ReSpFLSjK_uaTjg@mail.gmail.com>
	<CAG82UfATyMop6CpV-rtp48+u3rwFDRn7C28AKuPM=PDffP4SLA@mail.gmail.com>
Message-ID: <CAG82UfDc1BQydGJu83LY3gXFNZUWZP2bWLvhGi0-Q9UFN+AKXA@mail.gmail.com>

On Oct 29, 2016 15:22, "Tim Billingsley" <kd5ckp at gmail.com> wrote:
>
> Is anyone aware of a good "for dummies" troubleshooting guide for Astron
or just power supplies in general? I would prefer something specific to
Astron.
>
> "For dummies" may be taking it a bit far, but step by step would be good.
Symptom/probable cause/probable solution would be best. I have only
repaired one supply in my time and it was pretty straight forward, the
TIP29 was bad and one PASS transistor. So I just replaced all and the TIP29.
>
> Suggestions or links appreciated.

Thank you all for your suggestions  and encouragement.  At this point I am
lost. The symptoms are as such. After acquiring and installing the new
power switch I read through
http://www.repeater-builder.com/astron/astron-repair/astron-repair.html and
tried to deduce what the problem is, but from what I have gleaned from this
information I still have not resolved the isse. What is happening is that I
am showing a solid 13.8vdc +/- on the Voltmeter but as soon as you apply
even nominal load (in this case an 8W LED array) the voltage drops to zero.
>From what I gathered from the aforementioned document I would think the
main filter cap would be the issue but it seems to test fine. I have out of
complete loss for an answer replaced the LM723 and all four 2N3771s...no
go. I am open to suggestions. I probably overlooked something in my reading
or this particular situation was just not addressed.

Several of you offered to help me diagnose this PSU and I had hoped to do
this alone, but so far it hasn't happened. While it has been a good
learning experience I obviously have a ways to go yet and i would
appreciate any assistance ant of you care to offer.

If you would like to help please email me directly so we don't tie up the
lists.
kd5ckp gmail com <kd5ckp at gmail.com> see the QRZ link below if needed

Thank you all again and the list moderators for the off topic bandwidth.

Tim KD5CKP
http://www.qrz.com/db/kd5ckp

From kgordon2006 at frontier.com  Fri Nov 11 15:43:27 2016
From: kgordon2006 at frontier.com (Kenneth G. Gordon)
Date: Fri, 11 Nov 2016 12:43:27 -0800
Subject: [Kenwood] ASTRON RS-35M
In-Reply-To: <CAG82UfDc1BQydGJu83LY3gXFNZUWZP2bWLvhGi0-Q9UFN+AKXA@mail.gmail.com>
References: <CAG82UfCCu1H++d8GiMd1LYO55s94gPPJxkGVWumVaavJqAdheg@mail.gmail.com>,
	<CAG82UfATyMop6CpV-rtp48+u3rwFDRn7C28AKuPM=PDffP4SLA@mail.gmail.com>,
	<CAG82UfDc1BQydGJu83LY3gXFNZUWZP2bWLvhGi0-Q9UFN+AKXA@mail.gmail.com>
Message-ID: <58262D6F.26114.F704A2@kgordon2006.frontier.com>

Tim: 

Many years ago, I had a similar, if not identical, problem with a couple of  Astron RS-35s. At 
that time, I called Astron, mentioned the problem, and the designer told me of a design or 
build error which could be easily fixed.

I am going to have to look in my voluminous files for the exact information, but will do so and 
will get back with you as soon as I possibly can. I only hope I can still find it.

Whatever it was that he told me was extremely easy to fix.

Hang in there for a bit.

Ken W7EKB

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From kd5ckp at gmail.com  Fri Nov 11 15:50:49 2016
From: kd5ckp at gmail.com (Tim Billingsley)
Date: Fri, 11 Nov 2016 20:50:49 +0000
Subject: [Kenwood] ASTRON RS-35M
In-Reply-To: <58262D6F.26114.F704A2@kgordon2006.frontier.com>
References: <CAG82UfCCu1H++d8GiMd1LYO55s94gPPJxkGVWumVaavJqAdheg@mail.gmail.com>
	<CAG82UfATyMop6CpV-rtp48+u3rwFDRn7C28AKuPM=PDffP4SLA@mail.gmail.com>
	<CAG82UfDc1BQydGJu83LY3gXFNZUWZP2bWLvhGi0-Q9UFN+AKXA@mail.gmail.com>
	<58262D6F.26114.F704A2@kgordon2006.frontier.com>
Message-ID: <CAG82UfD7gUbhvzz6NDrggUdjfLmfs2zqJR+05O1t-+m74F2yOg@mail.gmail.com>

Hanging. Thank you.

On Nov 11, 2016 14:43, "Kenneth G. Gordon" <kgordon2006 at frontier.com> wrote:

> Tim:
>
> Many years ago, I had a similar, if not identical, problem with a couple
> of  Astron RS-35s. At
> that time, I called Astron, mentioned the problem, and the designer told
> me of a design or
> build error which could be easily fixed.
>
> I am going to have to look in my voluminous files for the exact
> information, but will do so and
> will get back with you as soon as I possibly can. I only hope I can still
> find it.
>
> Whatever it was that he told me was extremely easy to fix.
>
> Hang in there for a bit.
>
> Ken W7EKB
>
> ---
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus
>
>

From kgordon2006 at frontier.com  Fri Nov 11 16:23:20 2016
From: kgordon2006 at frontier.com (Kenneth G. Gordon)
Date: Fri, 11 Nov 2016 13:23:20 -0800
Subject: [Kenwood] ASTRON RS-35M - FOUND it!
In-Reply-To: <CAG82UfDc1BQydGJu83LY3gXFNZUWZP2bWLvhGi0-Q9UFN+AKXA@mail.gmail.com>
References: <CAG82UfCCu1H++d8GiMd1LYO55s94gPPJxkGVWumVaavJqAdheg@mail.gmail.com>,
	<CAG82UfATyMop6CpV-rtp48+u3rwFDRn7C28AKuPM=PDffP4SLA@mail.gmail.com>,
	<CAG82UfDc1BQydGJu83LY3gXFNZUWZP2bWLvhGi0-Q9UFN+AKXA@mail.gmail.com>
Message-ID: <582636C8.32619.11B851D@kgordon2006.frontier.com>

OK. Here's the deal. This MAY NOT be related to your problem, but you may wish to check 
it anyway.

According to Astron, there are two components associated with the LM-723 which may be 
causing trouble: these are C-3, which is connected to pin 15 of the LM-723. It is 0.01 mfd at 
50 volts. Remove this cap in every case.

Secondly, already silkscreened onto the board is R-3X, but it may or may not be installed.

If it is not installed or if it is the incorrect value, it should be 5K ohms at 1/2 watt.

Install that.

What happens when R-3X is missing is that at the upper limit of current capability, there is 
too much hysterisis in the system and it shuts down. This MAY be related to your issue.

On one end, R-3X connects to pin 2 of the LM-723 and goes to common on the other.

Lastly, there was a problem common to all of the Astron power supplies I worked on (this 
was back in December of 2005, BTW) in that the output connectors may be missing their 
flat-washers, and maybe even their lock washers. In attempting to tighten the output 
connectors, one can instead loosen the entire bolt associated with that connector. This 
causes a large voltage drop at the output connector which then causes the supply to lose 
control.

I had to replace the LM-723 in at least one of the supplies I worked on as the original one 
would not regulate properly.

I used an LM-723CN, a military grade unit, which has much "tighter" specifications than 
some of Astron's originals.

One of the 35A power supplies I repaired then showed 13.72 volts at no load, and 13.80 
volts at a load of 35 amps.

Anyway, let me know if this helps or not.

Ken W7EKB

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From kd5ckp at gmail.com  Fri Nov 11 17:35:42 2016
From: kd5ckp at gmail.com (Tim Billingsley)
Date: Fri, 11 Nov 2016 22:35:42 +0000
Subject: [Kenwood] ASTRON RS-35M
In-Reply-To: <87A0266C631544F082EEDB1CBEB145AB@DENDESK1>
References: <CAG82UfCCu1H++d8GiMd1LYO55s94gPPJxkGVWumVaavJqAdheg@mail.gmail.com>
	<CAG82UfDKLtfHcNt7EPbixT98fjvanpa_fPHh76rBqMUcU4==GQ@mail.gmail.com>
	<CAG82UfDzmdoojEzk+9dRNUh_QNua8MoO2qFu0TMV4cGHQ=ZwRg@mail.gmail.com>
	<CAG82UfBLsC1=wEgGtKr7VntQO-1Ff-n-E84ReSpFLSjK_uaTjg@mail.gmail.com>
	<CAG82UfATyMop6CpV-rtp48+u3rwFDRn7C28AKuPM=PDffP4SLA@mail.gmail.com>
	<CAG82UfDc1BQydGJu83LY3gXFNZUWZP2bWLvhGi0-Q9UFN+AKXA@mail.gmail.com>
	<87A0266C631544F082EEDB1CBEB145AB@DENDESK1>
Message-ID: <CAG82UfCTrArMsYmxK2S=c-6K4o_yn7+RjwtGaQOMFG1hco_CXw@mail.gmail.com>

On Nov 11, 2016 15:48, "W8BVH" <w8bvh at sbcglobal.net> wrote:
>
> Aw heck,
> Tie up the list so the rest of us will have some good reading. That's
what the list is for; not to grow flowers and be quiet. That's how I find
things out. It's wonderful that others with so much knowledge are willing
to help out and it is also wonderful that even though I don't have the
problem I get a lot of information I may need later.
> Best regards,
> Ralph Howes
> w8bvh
>
>

Thanks Ralph. I feel the same but too often I see people grumble or even in
subscribe when a thread carries on too much.

From kgordon2006 at frontier.com  Fri Nov 11 18:55:43 2016
From: kgordon2006 at frontier.com (Kenneth G. Gordon)
Date: Fri, 11 Nov 2016 15:55:43 -0800
Subject: [Kenwood] ASTRON RS-35M - FOUND it!
In-Reply-To: <1314983413.2149315.1478907274180@mail.yahoo.com>
References: <CAG82UfCCu1H++d8GiMd1LYO55s94gPPJxkGVWumVaavJqAdheg@mail.gmail.com>,
	<582636C8.32619.11B851D@kgordon2006.frontier.com>,
	<1314983413.2149315.1478907274180@mail.yahoo.com>
Message-ID: <58265A7F.31660.1A7092E@kgordon2006.frontier.com>

On 11 Nov 2016 at 23:34, Larry L. Hinton wrote:

> 
> Sorry for the intrusion Ken,
> 
> This information is good to know as I have three of Astron's power supplies. None have gone 
> bad yet, but there is no reason not to make improvements.
> 
> One item to be careful with. All the data sheets I have show the LM-723C as Commercial Temp 
> (0C to 70C). The LM-723 is the Industrial/Military Temp (-55C to 125C). One in particular is from 
> STMicroelectronics.

Thanks, Larry. 

When I did the work, it was in 2003, and the version I chose was the CN, not the C version. 
I don't know how things have changed since then, but I would certainly choose the more 
highly rated unit now.

vy 73 for now,

Ken W7EKB

---
This email has been checked for viruses by Avast antivirus software.
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From kd5ckp at gmail.com  Fri Nov 11 19:53:36 2016
From: kd5ckp at gmail.com (Tim Billingsley)
Date: Sat, 12 Nov 2016 00:53:36 +0000
Subject: [Kenwood] ASTRON RS-35M
In-Reply-To: <CAG82UfCTrArMsYmxK2S=c-6K4o_yn7+RjwtGaQOMFG1hco_CXw@mail.gmail.com>
References: <CAG82UfCCu1H++d8GiMd1LYO55s94gPPJxkGVWumVaavJqAdheg@mail.gmail.com>
	<CAG82UfDKLtfHcNt7EPbixT98fjvanpa_fPHh76rBqMUcU4==GQ@mail.gmail.com>
	<CAG82UfDzmdoojEzk+9dRNUh_QNua8MoO2qFu0TMV4cGHQ=ZwRg@mail.gmail.com>
	<CAG82UfBLsC1=wEgGtKr7VntQO-1Ff-n-E84ReSpFLSjK_uaTjg@mail.gmail.com>
	<CAG82UfATyMop6CpV-rtp48+u3rwFDRn7C28AKuPM=PDffP4SLA@mail.gmail.com>
	<CAG82UfDc1BQydGJu83LY3gXFNZUWZP2bWLvhGi0-Q9UFN+AKXA@mail.gmail.com>
	<87A0266C631544F082EEDB1CBEB145AB@DENDESK1>
	<CAG82UfCTrArMsYmxK2S=c-6K4o_yn7+RjwtGaQOMFG1hco_CXw@mail.gmail.com>
Message-ID: <CAG82UfBB7ZyT_PePp2AFPq5iPLVjo1sM4Vy8uH1Ot9-ik+P8sw@mail.gmail.com>

Tim, check the emitter resistors on the pass transistors.  If they're OK,
try disconnecting the crowbar SCR.

If disconnecting the SCR does the trick, look to the over-current
protection circuit.

73  <>  Carl

----

Check out Linear ICs application books (from Texas Instruments, National
Semiconductor or others that make LM723) and look at the pages for the
LM723 (I think) IC that is pretty much the heart of all Astron Linear Mode
regulated power supplies. Astron's design does not deviate very much from
what you will find in those books. Almost the only difference between
various models of Astron linear mode regulated power supplies is the size
ot the transformer, the size of the diodes or diode bridge, the size of the
filter capacitors and the number of 2N3055 transistors needed for the
current rating.  Ok sure that may be an overgeneralization, but it is not
very far from the truth.

DE N6KB


----
OK. Here's the deal. This MAY NOT be related to your problem, but you may
wish to check
it anyway.

According to Astron, there are two components associated with the LM-723
which may be
causing trouble: these are C-3, which is connected to pin 15 of the LM-723.
It is 0.01 mfd at
50 volts. Remove this cap in every case.

Secondly, already silkscreened onto the board is R-3X, but it may or may
not be installed.

If it is not installed or if it is the incorrect value, it should be 5K
ohms at 1/2 watt.

Install that.

What happens when R-3X is missing is that at the upper limit of current
capability, there is
too much hysterisis in the system and it shuts down. This MAY be related to
your issue.

On one end, R-3X connects to pin 2 of the LM-723 and goes to common on the
other.

Lastly, there was a problem common to all of the Astron power supplies I
worked on (this
was back in December of 2005, BTW) in that the output connectors may be
missing their
flat-washers, and maybe even their lock washers. In attempting to tighten
the output
connectors, one can instead loosen the entire bolt associated with that
connector. This
causes a large voltage drop at the output connector which then causes the
supply to lose
control.

I had to replace the LM-723 in at least one of the supplies I worked on as
the original one
would not regulate properly.

I used an LM-723CN, a military grade unit, which has much "tighter"
specifications than
some of Astron's originals.

One of the 35A power supplies I repaired then showed 13.72 volts at no
load, and 13.80
volts at a load of 35 amps.

Anyway, let me know if this helps or not.

Ken W7EKB

----

Aw heck,
Tie up the list so the rest of us will have some good reading. That's what
the list is for; not to grow flowers and be quiet. That's how I find things
out. It's wonderful that others with so much knowledge are willing to help
out and it is also wonderful that even though I don't have the problem I
get a lot of information I may need later.
Best regards,
Ralph Howes
w8bvh


----

On 11 Nov 2016 at 23:34, Larry L. Hinton wrote:

>
> Sorry for the intrusion Ken,
>
> This information is good to know as I have three of Astron's power
supplies. None have gone
> bad yet, but there is no reason not to make improvements.
>
> One item to be careful with. All the data sheets I have show the LM-723C
as Commercial Temp
> (0C to 70C). The LM-723 is the Industrial/Military Temp (-55C to 125C).
One in particular is from
> STMicroelectronics.

Thanks, Larry.

When I did the work, it was in 2003, and the version I chose was the CN,
not the C version.
I don't know how things have changed since then, but I would certainly
choose the more
highly rated unit now.

vy 73 for now,

Ken W7EKB

----



Thank you all for your assistance and instruction. This will take me a bit
to work through given my abilities and the fact that y'all say this stuff
like I am an old hand at thisf. Unfortunately I am re-learning as I go.
Some f the stuff y'all have directed me to do I simply have no concept
where to start. I hate to come off as a big dummy but it is what it is. I
will start taking pictures as needed, but I have no idea what EXACTLY I am
supposed to be looking for in some of these instances and I hate to just
guess.  I would (when all of this is over and done and the PSU is working
properly again) like to put together a presentation for our club on how to
diagnose and repair PSU issues, but first I have to learn what I am doing.
Y'all's patience and instruction is appreciated. Take this to a remedial
level and offer diagrams or pictures so I know better what I am looking for
and not just tearing stuff apart in a hit and miss kind of tangle. Act like
I have never done this kind of stuff before and you are having to point to
each part and say "That is what you are looking for right there" and keep
in mind I am fighting chemo fog, shakey hands, bad eyes, and the attention
span of a gnat, but I am trying.

http://www.repeater-builder.com/astron/pdf/rs35m-2009-k2qde.pdf
http://www.repeater-builder.com/astron/astron-repair/astron-repair.html
http://www.repeater-builder.com/astron/pdf/power-supply-analysis.pdf
http://www.repeater-builder.com/astron/astron-index.html

From kd5ckp at gmail.com  Fri Nov 11 21:27:49 2016
From: kd5ckp at gmail.com (Tim Billingsley)
Date: Sat, 12 Nov 2016 02:27:49 +0000
Subject: [Kenwood] ASTRON RS-35M
In-Reply-To: <CAG82UfAkD=-Baz_p21VDkLRr=6m=2B8ELxxHSSpa3+NjbNPZjg@mail.gmail.com>
References: <CAG82UfCCu1H++d8GiMd1LYO55s94gPPJxkGVWumVaavJqAdheg@mail.gmail.com>
	<CAG82UfDKLtfHcNt7EPbixT98fjvanpa_fPHh76rBqMUcU4==GQ@mail.gmail.com>
	<CAG82UfDzmdoojEzk+9dRNUh_QNua8MoO2qFu0TMV4cGHQ=ZwRg@mail.gmail.com>
	<CAG82UfBLsC1=wEgGtKr7VntQO-1Ff-n-E84ReSpFLSjK_uaTjg@mail.gmail.com>
	<CAG82UfATyMop6CpV-rtp48+u3rwFDRn7C28AKuPM=PDffP4SLA@mail.gmail.com>
	<CAG82UfDc1BQydGJu83LY3gXFNZUWZP2bWLvhGi0-Q9UFN+AKXA@mail.gmail.com>
	<87A0266C631544F082EEDB1CBEB145AB@DENDESK1>
	<CAG82UfCTrArMsYmxK2S=c-6K4o_yn7+RjwtGaQOMFG1hco_CXw@mail.gmail.com>
	<CAG82UfBB7ZyT_PePp2AFPq5iPLVjo1sM4Vy8uH1Ot9-ik+P8sw@mail.gmail.com>
	<CAG82UfCqXBCTzWJJ3Zb7ttQka5NpKpndOBW2O5PfmXtt1uaoSg@mail.gmail.com>
	<CAG82UfAkD=-Baz_p21VDkLRr=6m=2B8ELxxHSSpa3+NjbNPZjg@mail.gmail.com>
Message-ID: <CAG82UfAQq7zd2jW_t-63jTDh0TwJk_06W7GaRaJSfp-aMn7pyw@mail.gmail.com>

On Nov 11, 2016 19:36, "Tim Billingsley" <kd5ckp at gmail.com> wrote:
>
> Attached SCR? and I assume the large power resistor is the pass
transistor resistor previously mentioned.
>
> Now how to "disconnect"  the SCR and not blow something up and get the
expected results.
>
> The emitter resistors all "look" OK. No obvious superficial damage or
discoloration.
>
> As for the rest, this is what I see. If anyone needs a shot of some other
component please advise which and where.

The mailer rejected my post due to the size so here are the images on
Google Drive.

https://drive.google.com/folderview?id=0ByMU_dhkWmEgcWRVV3YwTGo2WW8

From JimMiller at STL-OnLine.Net  Fri Nov 11 22:31:02 2016
From: JimMiller at STL-OnLine.Net (Jim Miller)
Date: Fri, 11 Nov 2016 21:31:02 -0600
Subject: [Kenwood] ASTRON RS-35M
In-Reply-To: <58262D6F.26114.F704A2@kgordon2006.frontier.com>
References: <CAG82UfCCu1H++d8GiMd1LYO55s94gPPJxkGVWumVaavJqAdheg@mail.gmail.com>,
	<CAG82UfATyMop6CpV-rtp48+u3rwFDRn7C28AKuPM=PDffP4SLA@mail.gmail.com>,
	<CAG82UfDc1BQydGJu83LY3gXFNZUWZP2bWLvhGi0-Q9UFN+AKXA@mail.gmail.com>
	<58262D6F.26114.F704A2@kgordon2006.frontier.com>
Message-ID: <000001d23c95$32425f90$96c71eb0$@STL-OnLine.Net>

Same thing here.  I called Astron, described the problem and what I had done
and he told me what to try.  Turns out that my problem was the incorrect
resisters in the crowbar circuit that would sense over current and trigger.
I asked what they should be/measure and it had the wrong resister installed.
I dug in my bins and came out with one that I could parallel with what was
there and it worked.  In my case it would only handle about 15 amps then
trigger instead of carrying anything more.  I am sure that is why the
previous owner had sole it.  The call cign on the back wsas not the person I
bought it form and I knew the call sign owner.  He wouldn't acknowledge
knowing anything about the problem, said he hadn't used it for that much
power (or course).  Still have it and it works great.

73 Jim KG0KP

-----Original Message-----
From: Kenwood [mailto:kenwood-bounces at mailman.qth.net] On Behalf Of Kenneth
G. Gordon
Sent: Friday, November 11, 2016 2:43 PM
To: Tim Billingsley
Cc: Kenwood at mailman.qth.net
Subject: Re: [Kenwood] ASTRON RS-35M

Tim: 

Many years ago, I had a similar, if not identical, problem with a couple of
Astron RS-35s. At that time, I called Astron, mentioned the problem, and the
designer told me of a design or build error which could be easily fixed.

I am going to have to look in my voluminous files for the exact information,
but will do so and will get back with you as soon as I possibly can. I only
hope I can still find it.

Whatever it was that he told me was extremely easy to fix.

Hang in there for a bit.

Ken W7EKB

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

______________________________________________________________
Kenwood mailing list
Home: http://mailman.qth.net/mailman/listinfo/kenwood
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Kenwood at mailman.qth.net

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From JimMiller at STL-OnLine.Net  Fri Nov 11 22:48:50 2016
From: JimMiller at STL-OnLine.Net (Jim Miller)
Date: Fri, 11 Nov 2016 21:48:50 -0600
Subject: [Kenwood] ASTRON RS-35M
In-Reply-To: <000001d23c95$32425f90$96c71eb0$@STL-OnLine.Net>
References: <CAG82UfCCu1H++d8GiMd1LYO55s94gPPJxkGVWumVaavJqAdheg@mail.gmail.com>,
	<CAG82UfATyMop6CpV-rtp48+u3rwFDRn7C28AKuPM=PDffP4SLA@mail.gmail.com>,
	<CAG82UfDc1BQydGJu83LY3gXFNZUWZP2bWLvhGi0-Q9UFN+AKXA@mail.gmail.com>	<58262D6F.26114.F704A2@kgordon2006.frontier.com>
	<000001d23c95$32425f90$96c71eb0$@STL-OnLine.Net>
Message-ID: <000101d23c97$aeaa2480$0bfe6d80$@STL-OnLine.Net>

The only other problem I have experienced with the Astron was a 20 amp and I
probably was running it too hard and it blew the 723 chip.  I now have a 723
chip taped to the inside of the lid in each of my Astrons.  Haven't needed
another yet. Conclusion is to get a spare and you will never need it hi hi.

73,Jim KG0KP

-----Original Message-----
From: Kenwood [mailto:kenwood-bounces at mailman.qth.net] On Behalf Of Jim
Miller
Sent: Friday, November 11, 2016 9:31 PM
To: 'Kenneth G. Gordon'; 'Tim Billingsley'
Cc: Kenwood at mailman.qth.net
Subject: Re: [Kenwood] ASTRON RS-35M

Same thing here.  I called Astron, described the problem and what I had done
and he told me what to try.  Turns out that my problem was the incorrect
resisters in the crowbar circuit that would sense over current and trigger.
I asked what they should be/measure and it had the wrong resister installed.
I dug in my bins and came out with one that I could parallel with what was
there and it worked.  In my case it would only handle about 15 amps then
trigger instead of carrying anything more.  I am sure that is why the
previous owner had sole it.  The call cign on the back wsas not the person I
bought it form and I knew the call sign owner.  He wouldn't acknowledge
knowing anything about the problem, said he hadn't used it for that much
power (or course).  Still have it and it works great.

73 Jim KG0KP

-----Original Message-----
From: Kenwood [mailto:kenwood-bounces at mailman.qth.net] On Behalf Of Kenneth
G. Gordon
Sent: Friday, November 11, 2016 2:43 PM
To: Tim Billingsley
Cc: Kenwood at mailman.qth.net
Subject: Re: [Kenwood] ASTRON RS-35M

Tim: 

Many years ago, I had a similar, if not identical, problem with a couple of
Astron RS-35s. At that time, I called Astron, mentioned the problem, and the
designer told me of a design or build error which could be easily fixed.

I am going to have to look in my voluminous files for the exact information,
but will do so and will get back with you as soon as I possibly can. I only
hope I can still find it.

Whatever it was that he told me was extremely easy to fix.

Hang in there for a bit.

Ken W7EKB

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

______________________________________________________________
Kenwood mailing list
Home: http://mailman.qth.net/mailman/listinfo/kenwood
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Kenwood at mailman.qth.net

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Please help support this email list: http://www.qsl.net/donate.html


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Kenwood mailing list
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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Kenwood at mailman.qth.net

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Please help support this email list: http://www.qsl.net/donate.html



From kd5ckp at gmail.com  Fri Nov 11 23:22:22 2016
From: kd5ckp at gmail.com (Tim Billingsley)
Date: Sat, 12 Nov 2016 04:22:22 +0000
Subject: [Kenwood] ASTRON RS-35M
In-Reply-To: <000101d23c97$aeaa2480$0bfe6d80$@STL-OnLine.Net>
References: <CAG82UfCCu1H++d8GiMd1LYO55s94gPPJxkGVWumVaavJqAdheg@mail.gmail.com>
	<CAG82UfATyMop6CpV-rtp48+u3rwFDRn7C28AKuPM=PDffP4SLA@mail.gmail.com>
	<CAG82UfDc1BQydGJu83LY3gXFNZUWZP2bWLvhGi0-Q9UFN+AKXA@mail.gmail.com>
	<58262D6F.26114.F704A2@kgordon2006.frontier.com>
	<000001d23c95$32425f90$96c71eb0$@STL-OnLine.Net>
	<000101d23c97$aeaa2480$0bfe6d80$@STL-OnLine.Net>
Message-ID: <CAG82UfAQ2x5dKLFxnhZP0yz_ovChBxBw3KLw1mh=hzhsO_jAgQ@mail.gmail.com>

I currently have 9 spares. ;-)

On Nov 11, 2016 21:49, "Jim Miller" <JimMiller at stl-online.net> wrote:

> The only other problem I have experienced with the Astron was a 20 amp and
> I
> probably was running it too hard and it blew the 723 chip.  I now have a
> 723
> chip taped to the inside of the lid in each of my Astrons.  Haven't needed
> another yet. Conclusion is to get a spare and you will never need it hi hi.
>
> 73,Jim KG0KP
>
> -----Original Message-----
> From: Kenwood [mailto:kenwood-bounces at mailman.qth.net] On Behalf Of Jim
> Miller
> Sent: Friday, November 11, 2016 9:31 PM
> To: 'Kenneth G. Gordon'; 'Tim Billingsley'
> Cc: Kenwood at mailman.qth.net
> Subject: Re: [Kenwood] ASTRON RS-35M
>
> Same thing here.  I called Astron, described the problem and what I had
> done
> and he told me what to try.  Turns out that my problem was the incorrect
> resisters in the crowbar circuit that would sense over current and trigger.
> I asked what they should be/measure and it had the wrong resister
> installed.
> I dug in my bins and came out with one that I could parallel with what was
> there and it worked.  In my case it would only handle about 15 amps then
> trigger instead of carrying anything more.  I am sure that is why the
> previous owner had sole it.  The call cign on the back wsas not the person
> I
> bought it form and I knew the call sign owner.  He wouldn't acknowledge
> knowing anything about the problem, said he hadn't used it for that much
> power (or course).  Still have it and it works great.
>
> 73 Jim KG0KP
>
> -----Original Message-----
> From: Kenwood [mailto:kenwood-bounces at mailman.qth.net] On Behalf Of
> Kenneth
> G. Gordon
> Sent: Friday, November 11, 2016 2:43 PM
> To: Tim Billingsley
> Cc: Kenwood at mailman.qth.net
> Subject: Re: [Kenwood] ASTRON RS-35M
>
> Tim:
>
> Many years ago, I had a similar, if not identical, problem with a couple of
> Astron RS-35s. At that time, I called Astron, mentioned the problem, and
> the
> designer told me of a design or build error which could be easily fixed.
>
> I am going to have to look in my voluminous files for the exact
> information,
> but will do so and will get back with you as soon as I possibly can. I only
> hope I can still find it.
>
> Whatever it was that he told me was extremely easy to fix.
>
> Hang in there for a bit.
>
> Ken W7EKB
>
> ---
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus
>
> ______________________________________________________________
> Kenwood mailing list
> Home: http://mailman.qth.net/mailman/listinfo/kenwood
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Kenwood at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>
> ______________________________________________________________
> Kenwood mailing list
> Home: http://mailman.qth.net/mailman/listinfo/kenwood
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Kenwood at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>
>

From snowy.howell at btinternet.com  Sat Nov 12 03:58:23 2016
From: snowy.howell at btinternet.com (ROLAND HOWELL)
Date: Sat, 12 Nov 2016 08:58:23 +0000 (UTC)
Subject: [Kenwood] Re ASTRON PSU RM50
References: <1719362998.4345651.1478941103250.ref@mail.yahoo.com>
Message-ID: <1719362998.4345651.1478941103250@mail.yahoo.com>

 Hi TimI have repaired a couple of these in my time, the first one was an interesting one, multiple faults on it.?The first of which was 18v AC on the top of the large smoothing cap/regulator board, this turned out to be the 2 very?large rectifier diodes on the back, 1 x?O/C the other S/C, replaced those and that sorted that problem, now have 36v DC on the top of the smoothing cap.Then I couldn't get the 723 ic to perform, so replaced that and as an added measure all?of the small caps dotted (electrolytic and low value types), always replace the cap ( if my grey cell is working, I think its 100pf) between the higher number pins on the 723).That's good now have 13.8v at the output, but, ( there's always a but huh), it was unable to supply more that a few amps.
This turned out to be most of the pass trannies emitter wiring, dry jointed, apparently this is a common problem with ASTRON PSU,s. Having remade those?soldered connections, all is now well. As an after thought test each emitter connection by pulling gently on it, it may look ok but I found that the best thing was to remake all of them.
The main smoothing cap is prohibitively expensive here in the UK, but, ASTRON were very good and put me onto their parts dealer who shipped me a couple here ( including a free mains switch! you don't?get that here! )?to the UK for a lot less.
The 2nd one was just the soldering of the pass trannies.
Hope that helps, used in conjunction with other advice on here you will get it up and running in a little while
RegardsSnowy G0HZE????

From wrcromwell at gmail.com  Sat Nov 12 11:17:13 2016
From: wrcromwell at gmail.com (Bill Cromwell)
Date: Sat, 12 Nov 2016 11:17:13 -0500
Subject: [Kenwood] Kenwood Digest, Vol 144,
	Issue 1 - TS-520 (James Searcy)
In-Reply-To: <mailman.11709.1478897459.7384.kenwood@mailman.qth.net>
References: <mailman.11709.1478897459.7384.kenwood@mailman.qth.net>
Message-ID: <152db695-db63-0b34-ec33-15bf3caedaf1@gmail.com>

Hi Jim,

In Cw mode it uses the VOX system to shift to transmit for 
'semi-breakin'. If you have VOX enabled in the phone modes it will also 
be active there (even though the mic may be disconnected if your donn't 
make the PTT on the mic). The control labeled "Vox Delay" determines how 
long it stays in TX mode *after* you stop talking (phone) or keying 
(CW). Start looking there.

On My Twins in the T-599 my VOX drops out virtually immediately and I 
need to replace the pot that controls that (opposite problem from 
yours). Meanwhile (8 years now) I just use the manual mode (works fine 
with push to talk) for both CW and phone. If I recall the switches and 
controls are in different locations on your 520 but they all work the 
same way.

Do you have a good copy of the manual for your radio? I'm not sure how 
good the manual (if any) is on BAMA.

Good luck with your 520.

73,

Bill  KU8H

> Message: 6
> Date: Thu, 10 Nov 2016 17:51:32 -0600
> From: James Searcy <j.searcy65 at gmail.com>
> To: Kenwood at mailman.qth.net
> Subject: [Kenwood] TS-520
> Message-ID:
> 	<CAPvWwfqOZajSJW9Lxyz48AOo1tj3A9Js3XrDNcn9kB7eytM01Q at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> My Kenwood TS-520 has recently started doing something it has never done.
> When keyed up (either by microphone or key) it will stay keyed up on its
> own, when transistion to receive is attempted. Are there any ideas as to
> the cause ???   Jim   WA5WRE
>


From kd5ckp at gmail.com  Sat Nov 12 13:41:32 2016
From: kd5ckp at gmail.com (Tim Billingsley)
Date: Sat, 12 Nov 2016 18:41:32 +0000
Subject: [Kenwood] Re ASTRON PSU RM50
In-Reply-To: <1719362998.4345651.1478941103250@mail.yahoo.com>
References: <1719362998.4345651.1478941103250.ref@mail.yahoo.com>
	<1719362998.4345651.1478941103250@mail.yahoo.com>
Message-ID: <CAG82UfBqifBmyc065ffPXKmGZoFNS4u+Pp2RykWas9dLdf8Q+g@mail.gmail.com>

Thank you for the insight.  I am beginning to think my best option is to
take pictures of everything,  make diagrams, and start pulling it apart and
build it back from scratch.  LOL

Thanks again

On Nov 12, 2016 03:02, "ROLAND HOWELL" <snowy.howell at btinternet.com> wrote:

>  Hi TimI have repaired a couple of these in my time, the first one was an
> interesting one, multiple faults on it. The first of which was 18v AC on
> the top of the large smoothing cap/regulator board, this turned out to be
> the 2 very large rectifier diodes on the back, 1 x O/C the other S/C,
> replaced those and that sorted that problem, now have 36v DC on the top of
> the smoothing cap.Then I couldn't get the 723 ic to perform, so replaced
> that and as an added measure all of the small caps dotted (electrolytic and
> low value types), always replace the cap ( if my grey cell is working, I
> think its 100pf) between the higher number pins on the 723).That's good now
> have 13.8v at the output, but, ( there's always a but huh), it was unable
> to supply more that a few amps.
> This turned out to be most of the pass trannies emitter wiring, dry
> jointed, apparently this is a common problem with ASTRON PSU,s. Having
> remade those soldered connections, all is now well. As an after thought
> test each emitter connection by pulling gently on it, it may look ok but I
> found that the best thing was to remake all of them.
> The main smoothing cap is prohibitively expensive here in the UK, but,
> ASTRON were very good and put me onto their parts dealer who shipped me a
> couple here ( including a free mains switch! you don't get that here! ) to
> the UK for a lot less.
> The 2nd one was just the soldering of the pass trannies.
> Hope that helps, used in conjunction with other advice on here you will
> get it up and running in a little while
> RegardsSnowy G0HZE
> ______________________________________________________________
> Kenwood mailing list
> Home: http://mailman.qth.net/mailman/listinfo/kenwood
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Kenwood at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

From w4upd at cfl.rr.com  Sat Nov 12 14:13:35 2016
From: w4upd at cfl.rr.com (w4upd)
Date: Sat, 12 Nov 2016 14:13:35 -0500
Subject: [Kenwood] Re ASTRON PSU RM50
In-Reply-To: <CAG82UfBqifBmyc065ffPXKmGZoFNS4u+Pp2RykWas9dLdf8Q+g@mail.gmail.com>
References: <1719362998.4345651.1478941103250.ref@mail.yahoo.com>
	<1719362998.4345651.1478941103250@mail.yahoo.com>
	<CAG82UfBqifBmyc065ffPXKmGZoFNS4u+Pp2RykWas9dLdf8Q+g@mail.gmail.com>
Message-ID: <582769DF.2050903@cfl.rr.com>

One thing I don't think was mentioned before was what the voltage under 
was to regulator input? We know that your output essentially goes to 
zero with load on the output. What is the voltage going into the actual 
pass transistors? Also, check voltage on the filter caps at this time. 
If voltage on the output after the pass transistors is low, but input is 
still higher (ex. 16 - 20vdc), then the problem is regulator circuitry. 
If the input to the pass transistors drops as well, then your problem is 
before the transistors. I would then suspect transformer (not too 
likely), bridge rectifier, etc.

Reid, W4UPD


On 11/12/2016 1:41 PM, Tim Billingsley wrote:
> Thank you for the insight.  I am beginning to think my best option is to
> take pictures of everything,  make diagrams, and start pulling it apart and
> build it back from scratch.  LOL
>
> Thanks again
>
> On Nov 12, 2016 03:02, "ROLAND HOWELL" <snowy.howell at btinternet.com> wrote:
>
>>   Hi TimI have repaired a couple of these in my time, the first one was an
>> interesting one, multiple faults on it. The first of which was 18v AC on
>> the top of the large smoothing cap/regulator board, this turned out to be
>> the 2 very large rectifier diodes on the back, 1 x O/C the other S/C,
>> replaced those and that sorted that problem, now have 36v DC on the top of
>> the smoothing cap.Then I couldn't get the 723 ic to perform, so replaced
>> that and as an added measure all of the small caps dotted (electrolytic and
>> low value types), always replace the cap ( if my grey cell is working, I
>> think its 100pf) between the higher number pins on the 723).That's good now
>> have 13.8v at the output, but, ( there's always a but huh), it was unable
>> to supply more that a few amps.
>> This turned out to be most of the pass trannies emitter wiring, dry
>> jointed, apparently this is a common problem with ASTRON PSU,s. Having
>> remade those soldered connections, all is now well. As an after thought
>> test each emitter connection by pulling gently on it, it may look ok but I
>> found that the best thing was to remake all of them.
>> The main smoothing cap is prohibitively expensive here in the UK, but,
>> ASTRON were very good and put me onto their parts dealer who shipped me a
>> couple here ( including a free mains switch! you don't get that here! ) to
>> the UK for a lot less.
>> The 2nd one was just the soldering of the pass trannies.
>> Hope that helps, used in conjunction with other advice on here you will
>> get it up and running in a little while
>> RegardsSnowy G0HZE
>> ______________________________________________________________
>> Kenwood mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/kenwood
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Kenwood at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
> ______________________________________________________________
> Kenwood mailing list
> Home: http://mailman.qth.net/mailman/listinfo/kenwood
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Kenwood at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>


From kd5ckp at gmail.com  Sat Nov 12 21:48:03 2016
From: kd5ckp at gmail.com (Tim Billingsley)
Date: Sun, 13 Nov 2016 02:48:03 +0000
Subject: [Kenwood] Re ASTRON PSU RM50
In-Reply-To: <001b01d23d57$a4e81d10$eeb85730$@STL-OnLine.Net>
References: <1719362998.4345651.1478941103250.ref@mail.yahoo.com>
	<1719362998.4345651.1478941103250@mail.yahoo.com>
	<CAG82UfBqifBmyc065ffPXKmGZoFNS4u+Pp2RykWas9dLdf8Q+g@mail.gmail.com>
	<001b01d23d57$a4e81d10$eeb85730$@STL-OnLine.Net>
Message-ID: <CAG82UfDY=MKJXuGCXOmzpqHFM-t+Mk1jxgtqMZ-hHz40B0pEaw@mail.gmail.com>

On Nov 12, 2016 20:43, "Jim Miller" <JimMiller at stl-online.net> wrote:
>
> Hi again Tim, I worked on mainframes when they filled rooms.  When you too
> many "pieces" involved and you are having trouble isolating it from the
top,
> go to the bottom.  Find something that does work and add to it.
>
> As in, disconnect the transformer from the rectifier, verify probably
> correct unloaded voltage, then put a load on it and check that you still
> have voltage near what you had previously and not zero as in bad
transformer
> of poor connection into (or inside) the transformer.  Verify while it is
> still "on" and the voltage at zero that the input AT the transformer is
> still as expected.  Poor connection in wiring to the transformer or bad
> switch or fuse holder or breaker or connections.   I have heard of  "bad
> transformer" but not sure they really knew.
>
> Add in the ridge rectifier or diodes (2 or 4) with their output
> disconnected.  Meter them when disconnected.  Do you have a scope?  Power
an
> and see what you get. Add a load to the rectifier output.  Still have
power
> out?  Add on the electrolytic capacitors with their load disconnected.
> Still ok?  Add you load resistor across the cap.  Power?  That is the
power
> supply, now you have the regulator section remaining.  Disconnect the
> crowbar circuit.  It will be an SCR or a big transistor across the power
> supply output and triggered from the regulator circuit.  The power supply
> will run without it BUT YOU WILL NOT BE PROTECTED FROM OVERVOLTAGE.  OK to
> test though using resistors for loads .  You are down to the 723 chip and
> its surrounding components.  You can order the board but call Astron first
> and talk to a technician.  Tell him your problem and what you have done
and
> he added a couple of resisters after he asked me what the value was and
> asked if I had components.  He stayed on the phone while I found some that
> would work and soldered them in!!!!  It fixed it.  Can't ask for better
> support than that.
>
> Let us know,
> Good luck and 73, Jim KG0KP
>
>

Jim,

Thanks for the step by step. Hopefully I can walk thru this and some of the
other objectives tomorrow.

Thank to all for the assistance.

Tim KD5CKP
likespecies.com

From jimw7ry at gmail.com  Sun Nov 13 11:42:18 2016
From: jimw7ry at gmail.com (Jim W7RY)
Date: Sun, 13 Nov 2016 10:42:18 -0600
Subject: [Kenwood] ASTRON RS-35M - FOUND it!
In-Reply-To: <582636C8.32619.11B851D@kgordon2006.frontier.com>
References: <CAG82UfCCu1H++d8GiMd1LYO55s94gPPJxkGVWumVaavJqAdheg@mail.gmail.com>,
	<CAG82UfATyMop6CpV-rtp48+u3rwFDRn7C28AKuPM=PDffP4SLA@mail.gmail.com>,
	<CAG82UfDc1BQydGJu83LY3gXFNZUWZP2bWLvhGi0-Q9UFN+AKXA@mail.gmail.com>
	<582636C8.32619.11B851D@kgordon2006.frontier.com>
Message-ID: <9A8D808F408140538C039277FB42688D@JimsLaptop>

Be really careful of counterfeit parts that are on EBay. I would not buy 
anything like this from eBay. And absolutely DO NOT buy components from 
sellers off shore on EBay.

73
Jim W7RY


-----Original Message----- 
From: Kenneth G. Gordon
Sent: Friday, November 11, 2016 3:23 PM
To: kenwood at mailman.qth.net ; Tim Billingsley
Subject: Re: [Kenwood] ASTRON RS-35M - FOUND it!

OK. Here's the deal. This MAY NOT be related to your problem, but you may 
wish to check
it anyway.

According to Astron, there are two components associated with the LM-723 
which may be
causing trouble: these are C-3, which is connected to pin 15 of the LM-723. 
It is 0.01 mfd at
50 volts. Remove this cap in every case.

Secondly, already silkscreened onto the board is R-3X, but it may or may not 
be installed.

If it is not installed or if it is the incorrect value, it should be 5K ohms 
at 1/2 watt.

Install that.

What happens when R-3X is missing is that at the upper limit of current 
capability, there is
too much hysterisis in the system and it shuts down. This MAY be related to 
your issue.

On one end, R-3X connects to pin 2 of the LM-723 and goes to common on the 
other.

Lastly, there was a problem common to all of the Astron power supplies I 
worked on (this
was back in December of 2005, BTW) in that the output connectors may be 
missing their
flat-washers, and maybe even their lock washers. In attempting to tighten 
the output
connectors, one can instead loosen the entire bolt associated with that 
connector. This
causes a large voltage drop at the output connector which then causes the 
supply to lose
control.

I had to replace the LM-723 in at least one of the supplies I worked on as 
the original one
would not regulate properly.

I used an LM-723CN, a military grade unit, which has much "tighter" 
specifications than
some of Astron's originals.

One of the 35A power supplies I repaired then showed 13.72 volts at no load, 
and 13.80
volts at a load of 35 amps.

Anyway, let me know if this helps or not.

Ken W7EKB

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

______________________________________________________________
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From kenw8ek at gmail.com  Wed Nov 16 08:03:22 2016
From: kenw8ek at gmail.com (Ken, W8EK)
Date: Wed, 16 Nov 2016 08:03:22 -0500
Subject: [Kenwood] Kenwood Transceivers FS
Message-ID: <0aaaac31-b98c-3ecd-2b15-dcee6e0f233d@gmail.com>


Kenwood Transceivers For Sale:
HF + 6 meter Transceiver, Power Supply, Crystal Filters,
Microphones, Dual Band Transceiver, 2 meter multimode
transceiver, and more For Sale:
.
.
Kenwood TS-570SG, HF + 6 meters:

The Kenwood TS-570SG provides DSP technology for superb audio,
noise reduction, equalization and slope tuning. In SSB/AM/FM modes
you can select a Hi/Low cut DSP slope tune using 441 possible
combinations. In CW and FSK the DSP alters the passband width
for rejection of nearby signals.

It covers the amateur bands from 160-6 meters, plus a general
coverage receiver. Power output is from 5 to 100 watts. A preset
auto antenna tuner and electronic keyer are built in. The menu
system offers 46 types of functions. Full and semi break-in,
dedicated packet port, 57600 bps PC control, Keypad entry, 100
memories, IF shift, Scanning and CW Auto Tune are included.

This is the S G model with 6 meters and all of the latest
DSP features.

This rig works 100% and is a 9.9 cosmetically.
With hand mic, power cord, and manual for $675.
.
.
Kenwood PS-53 Power Supply

The Kenwood PS-53 power supply provides 13.8 VDC at
20.5 Amps (max continuous operation one hour) or 22.5
Amps at 25% duty cycle. Input is 120 VAC 60 Hz. Ripple
voltage is less than 20 mV rms (at 13.8 VDC 16A).
Regulation is ? 0.7 V at 10% input variation at 16 Amps.
Power consumption is 550 watts. This power supply features
a tilt bar. There are terminals for output on the back panel.
6.8 x 4.4 x 12.6 inches 15.2 lbs.

It works great and looks fine.

With Paper work for only $150.
.
.
Kenwood "Plug In" Crystal Filters:

All are for the 8.83 MHz IF, work 100% and look like new.
Paper work is included.

These are "plug in filters" as opposed to the type that must
be soldered in. They are used in rigs such as the TS-450, TS-570,
TS-690, TS-850, TS-930, TS-940, TS-950, and others.

Kenwood YK-88 C 1 Crystal Filter
500 Hz wide for CW and narrow digital.
Fits rigs as listed above. $79

Kenwood YK-88 S 1 Crystal Filter
This plug in filter is 2400 Hz wide and is used in the same
rigs as listed above. $75
.
.
Kenwood MC-43 Hand Mic

Has round 8 pin plug, with up/down switches.
Used on most of the Kenwood rigs with round 8
pin plugs.
Works 100%. $30
.
.
Kenwood TM-732 Dual Band FM Cross Band Repeat Transceiver:

The Kenwood TM-732A dual band 2 meter, 440 MHz transceiver
provides high performance communications with operating ease.
It features dual receive including V+V and U+U, built-in CTCSS,
DTSS and page functions, 50 memory channels and multi-scan
functions. The high visibility front panel is detachable.
Extended receive range is 118-174 MHz and 438-450 MHz. Power
output is 50/10/5 watts on 2 meters and 35/10/5 watts on 440
MHz. Requires 13.8 VDC at 11.5 amps. MC-45DM multifunction
DTMF hand mic included.

Features:
50 Memories
Scanning
CTCSS Encode
S Meter Squelch
Auto Power Off
Cross Band Repeat
DTMF Memory
Triple Tone Alert
DTSS Pager Function
DTMF Hand Mic

This particular unit works 100% and looks like new.  No scratches.

With paper work for $190.
.
.
Kenwood TS-700 A, 2 meter Multimode transceiver:

The Kenwood TS-700A multimode transceiver provides 2 meter
operation in FM, LSB, USB, AM and CW modes. Power output is
rated at 10 watts. It covers the entire 2 meter band.
Enhancements include RF gain, RIT, squelch, noise blanker and
44 fixed channels (11 per MHz band). Operation is from
120/220 VAC, or 13.8 VDC at 4 amps.

Features:
Multi-Mode
RIT
Noise Blanker
On-Air Indicator
Squelch
AC/DC Operation

This unit looks good. It transmits in all modes, but I am
90% sure someone took a "golden screwdriver" to it.  The
power output is in the 18 to 20 watt range instead of 11
to 12 as it should be.  This indicates some one has "tweaked"
it.  The frequency that it transmits and receives on is
not the same as indicated. Basically, I think it needs a
complete, accurate alignment, and then it would be great.

With paper work and 110 V AC power cord for $130.
The DC power cord is not included.
.
.
.
Other Kenwood Items, such as manuals, original boxes,
power cords, cables, etc. are also available.
.
.
I also have many other accessories available such as many
different types of microphones, HTs, VHF and UHF rigs, HF
and VHF/UHF antennas, connectors, miscellaneous accessories,
etc.
Just too many to list here. Please e-mail your requests.


Prices do not include shipping from Florida.

Thanks.

73,

Ken, W8EK

Ken Simpson
E-mail to W8EK at FLHam.net or W8EK at arrl.net
Voice Phone (352) 732-8400









From kd5ckp at gmail.com  Thu Nov 24 21:00:50 2016
From: kd5ckp at gmail.com (Tim Billingsley)
Date: Fri, 25 Nov 2016 02:00:50 +0000
Subject: [Kenwood] ASTRON RS-35M
In-Reply-To: <CAG82UfBM_42Z2LdMBCJP26jaTqKDp-L9QNgLidg5XUPuxhjwmQ@mail.gmail.com>
References: <CAG82UfCCu1H++d8GiMd1LYO55s94gPPJxkGVWumVaavJqAdheg@mail.gmail.com>
	<CAG82UfDKLtfHcNt7EPbixT98fjvanpa_fPHh76rBqMUcU4==GQ@mail.gmail.com>
	<CAG82UfDzmdoojEzk+9dRNUh_QNua8MoO2qFu0TMV4cGHQ=ZwRg@mail.gmail.com>
	<CAG82UfBLsC1=wEgGtKr7VntQO-1Ff-n-E84ReSpFLSjK_uaTjg@mail.gmail.com>
	<CAG82UfATyMop6CpV-rtp48+u3rwFDRn7C28AKuPM=PDffP4SLA@mail.gmail.com>
	<CAG82UfDc1BQydGJu83LY3gXFNZUWZP2bWLvhGi0-Q9UFN+AKXA@mail.gmail.com>
	<CAG82UfAJyhTa8QdYrfbis9fjZd9e6w1=cm5ZxO1eGsqxa+0iiA@mail.gmail.com>
	<CAG82UfD7Jf88T6iienTdsG6j0sVrPTyRRt9UKB0_Qvd+xDEmZw@mail.gmail.com>
	<CAG82UfCriFmtN8PRZ9CjUaW8gowS8QzJsyThTtNk6031Crr7_w@mail.gmail.com>
	<CAG82UfC27GFydXxLq5+sc3UJaWPODupH8M1YFZ8L-xRCi2qKWg@mail.gmail.com>
	<CAG82UfBM_42Z2LdMBCJP26jaTqKDp-L9QNgLidg5XUPuxhjwmQ@mail.gmail.com>
Message-ID: <CAG82UfB2b0JYO2Zvtkfk5AyrwYrLy6WYDwnaGRDo062JDWsc_w@mail.gmail.com>

Sorry, I had a dumba$$  moment.

Those are cap values not voltage test values. I was so focused on figuring
out the voltage errors I forgot what I was looking at until I looked at the
values going into the LM723.

Sorry...

From w2iy at verizon.net  Thu Nov 24 22:34:01 2016
From: w2iy at verizon.net (Michael Tortorella)
Date: Thu, 24 Nov 2016 22:34:01 -0500
Subject: [Kenwood] ASTRON RS-35M
In-Reply-To: <CAG82UfB2b0JYO2Zvtkfk5AyrwYrLy6WYDwnaGRDo062JDWsc_w@mail.gmail.com>
References: <CAG82UfCCu1H++d8GiMd1LYO55s94gPPJxkGVWumVaavJqAdheg@mail.gmail.com>
	<CAG82UfDKLtfHcNt7EPbixT98fjvanpa_fPHh76rBqMUcU4==GQ@mail.gmail.com>
	<CAG82UfDzmdoojEzk+9dRNUh_QNua8MoO2qFu0TMV4cGHQ=ZwRg@mail.gmail.com>
	<CAG82UfBLsC1=wEgGtKr7VntQO-1Ff-n-E84ReSpFLSjK_uaTjg@mail.gmail.com>
	<CAG82UfATyMop6CpV-rtp48+u3rwFDRn7C28AKuPM=PDffP4SLA@mail.gmail.com>
	<CAG82UfDc1BQydGJu83LY3gXFNZUWZP2bWLvhGi0-Q9UFN+AKXA@mail.gmail.com>
	<CAG82UfAJyhTa8QdYrfbis9fjZd9e6w1=cm5ZxO1eGsqxa+0iiA@mail.gmail.com>
	<CAG82UfD7Jf88T6iienTdsG6j0sVrPTyRRt9UKB0_Qvd+xDEmZw@mail.gmail.com>
	<CAG82UfCriFmtN8PRZ9CjUaW8gowS8QzJsyThTtNk6031Crr7_w@mail.gmail.com>
	<CAG82UfC27GFydXxLq5+sc3UJaWPODupH8M1YFZ8L-xRCi2qKWg@mail.gmail.com>
	<CAG82UfBM_42Z2LdMBCJP26jaTqKDp-L9QNgLidg5XUPuxhjwmQ@mail.gmail.com>
	<CAG82UfB2b0JYO2Zvtkfk5AyrwYrLy6WYDwnaGRDo062JDWsc_w@mail.gmail.com>
Message-ID: <F417C46A334743CFAB7826A1BAAABC5B@HomeDesktop>

Folks,
Just wanted to share another Astron RS30M story....no output....turned out
the voltage set trimpot on the regulator board was dirty.  Hit it with
cleaner, exercised a little, and now all fine.  Hope this helps someone.
73
Mike W2IY

-----Original Message-----
From: Kenwood [mailto:kenwood-bounces at mailman.qth.net] On Behalf Of Tim
Billingsley
Sent: Thursday, November 24, 2016 9:01 PM
To: kenwood at mailman.qth.net; TexasTradersNet
Subject: Re: [Kenwood] ASTRON RS-35M

Sorry, I had a dumba$$  moment.

Those are cap values not voltage test values. I was so focused on figuring
out the voltage errors I forgot what I was looking at until I looked at the
values going into the LM723.

Sorry...
______________________________________________________________
Kenwood mailing list
Home: http://mailman.qth.net/mailman/listinfo/kenwood
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Kenwood at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html


From kd5ckp at gmail.com  Fri Nov 25 00:06:23 2016
From: kd5ckp at gmail.com (Tim Billingsley)
Date: Fri, 25 Nov 2016 05:06:23 +0000
Subject: [Kenwood] ASTRON RS-35M
In-Reply-To: <F417C46A334743CFAB7826A1BAAABC5B@HomeDesktop>
References: <CAG82UfCCu1H++d8GiMd1LYO55s94gPPJxkGVWumVaavJqAdheg@mail.gmail.com>
	<CAG82UfDKLtfHcNt7EPbixT98fjvanpa_fPHh76rBqMUcU4==GQ@mail.gmail.com>
	<CAG82UfDzmdoojEzk+9dRNUh_QNua8MoO2qFu0TMV4cGHQ=ZwRg@mail.gmail.com>
	<CAG82UfBLsC1=wEgGtKr7VntQO-1Ff-n-E84ReSpFLSjK_uaTjg@mail.gmail.com>
	<CAG82UfATyMop6CpV-rtp48+u3rwFDRn7C28AKuPM=PDffP4SLA@mail.gmail.com>
	<CAG82UfDc1BQydGJu83LY3gXFNZUWZP2bWLvhGi0-Q9UFN+AKXA@mail.gmail.com>
	<CAG82UfAJyhTa8QdYrfbis9fjZd9e6w1=cm5ZxO1eGsqxa+0iiA@mail.gmail.com>
	<CAG82UfD7Jf88T6iienTdsG6j0sVrPTyRRt9UKB0_Qvd+xDEmZw@mail.gmail.com>
	<CAG82UfCriFmtN8PRZ9CjUaW8gowS8QzJsyThTtNk6031Crr7_w@mail.gmail.com>
	<CAG82UfC27GFydXxLq5+sc3UJaWPODupH8M1YFZ8L-xRCi2qKWg@mail.gmail.com>
	<CAG82UfBM_42Z2LdMBCJP26jaTqKDp-L9QNgLidg5XUPuxhjwmQ@mail.gmail.com>
	<CAG82UfB2b0JYO2Zvtkfk5AyrwYrLy6WYDwnaGRDo062JDWsc_w@mail.gmail.com>
	<F417C46A334743CFAB7826A1BAAABC5B@HomeDesktop>
Message-ID: <CAG82UfAkKnm4PXBT7HWb2x47Nxfx-HLyGMetMf5sUyP8ipG_GQ@mail.gmail.com>

On Nov 24, 2016 21:34, "Michael Tortorella" <w2iy at verizon.net> wrote:
>
> Folks,
> Just wanted to share another Astron RS30M story....no output....turned out
> the voltage set trimpot on the regulator board was dirty.  Hit it with
> cleaner, exercised a little, and now all fine.  Hope this helps someone.
> 73
> Mike W2IY

Thanks Mike. I will check that also. I also saw mention of removing it and
putting it on the "backside" of the regulator board for easier access. I
really don't think there is room to do it on this PSU, but they may have
used a different style of pot or it may have been mentioned for a different
PSU model. I have not measured the clearance right see it will fit yet.

From jluthy1 at verizon.net  Sat Nov 26 19:53:00 2016
From: jluthy1 at verizon.net (John)
Date: Sat, 26 Nov 2016 16:53:00 -0800
Subject: [Kenwood] TM-941 Display
Message-ID: <1edb5d71-0006-48bd-90ae-604cd1c9ecb2@verizon.net>

I have seen pictures of the TM-941  with what appears to be a color 
display,   can any one offer any info on this display?  Mine is the 
standard orange and black.   also is it possible to get the display to 
be reversed?  with a dark background and bright numbers.  I have looked 
in the manual but did not find the answers to my questions


John

N7JL

From jimw7ry at gmail.com  Sat Nov 26 20:15:54 2016
From: jimw7ry at gmail.com (Jim W7RY)
Date: Sat, 26 Nov 2016 19:15:54 -0600
Subject: [Kenwood] TS-940S Parts Radio For Sale
Message-ID: <CAF7eEW12H0zAGUVw45cVsf2V1_jmtpNpwKcKKnBKJhTYtrOpcA@mail.gmail.com>

Complete Kenwood TS-940S for parts or repair. Has the dot problem.

No tuner installed.
 $225.00 plus shipping. I have a nice big padded box for safe shipping.

Thanks
73
Jim W7RY

From zappy at xzapx.com  Tue Nov 29 02:14:45 2016
From: zappy at xzapx.com (Corey Sukalich)
Date: Tue, 29 Nov 2016 01:14:45 -0600
Subject: [Kenwood] Bad SM-220 Shaft Couplers
Message-ID: <B6105F92-2962-4497-A83E-B8702D09063E@xzapx.com>

Curious if there is a suitable replacement for the switch shaft couplers (Function, RF Att.) on the SM-220.  One of mine has cracked, and cross-referencing I only found a single source wanting $18 each for the nylon parts!  Ouch.  Guessing there has to be a better way.

Can anyone confirm if these really need to be isolated?  It looks like there are flex couplers available on eBay for much cheaper but so far I haven?t found one of the same dimensions.

I know some have replaced similar parts on other Kenwood radios with aftermarket solutions.  Thanks!

73,
Corey, N9WIV

From ku4bp at triad.rr.com  Tue Nov 29 05:21:01 2016
From: ku4bp at triad.rr.com (Ed Swiderski, KU4BP)
Date: Tue, 29 Nov 2016 05:21:01 -0500
Subject: [Kenwood] Bad SM-220 Shaft Couplers
In-Reply-To: <B6105F92-2962-4497-A83E-B8702D09063E@xzapx.com>
References: <B6105F92-2962-4497-A83E-B8702D09063E@xzapx.com>
Message-ID: <1f810111-56f4-36ec-7970-c563b41a68de@triad.rr.com>

I came across a similar issue on my AL-1200 amp a few years ago. Ace 
Hardware had nylon bushings for about 6 cents apiece.

Ed KU4BP


On 11/29/2016 2:14 AM, Corey Sukalich wrote:
> Curious if there is a suitable replacement for the switch shaft couplers (Function, RF Att.) on the SM-220.  One of mine has cracked, and cross-referencing I only found a single source wanting $18 each for the nylon parts!  Ouch.  Guessing there has to be a better way.
>
> Can anyone confirm if these really need to be isolated?  It looks like there are flex couplers available on eBay for much cheaper but so far I haven?t found one of the same dimensions.
>
> I know some have replaced similar parts on other Kenwood radios with aftermarket solutions.  Thanks!
>
> 73,
> Corey, N9WIV
> ______________________________________________________________
> Kenwood mailing list
> Home: http://mailman.qth.net/mailman/listinfo/kenwood
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Kenwood at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html


From kenw8ek at gmail.com  Tue Nov 29 11:55:11 2016
From: kenw8ek at gmail.com (Ken, W8EK)
Date: Tue, 29 Nov 2016 11:55:11 -0500
Subject: [Kenwood] TS-440 Parts FS
Message-ID: <98385e41-a9ad-24af-1a90-91881ed9f4af@gmail.com>


I am parting out a Kenwood TS-440 S AT.

Many parts are gone, but some remain.
.
.
Here is a list of some that are left:

AT-440 automatic antenna tuner, with cables  $90

Top cover  $20

Bottom cover $20

Front panel  $20

Internal speaker with cable  $12

Large tuning knob with "tire"  $20

Smaller knob set as used on AF/RF gain control $8

S meter  $12

Front fluorescent display with key pad  $40

IF Board (large board on top)  $45
.
.
There are some other parts available, so please let
me know what you need, and we can go from there.

Prices do not includes shipping from Florida.

Thanks.

73,

Ken, W8EK

Ken Simpson
E-mail to W8EK at FLHam.net or W8EK at arrl.net
Voice Phone  (352) 732-8400