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Author Topic: TS820 Kenwood  (Read 1250 times)
KJ4GXN
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Posts: 8




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« on: April 02, 2009, 08:13:18 AM »

When I turn this rig on lately, it sometimes goes into a scan mode, but not every time. The digital shows it scanning ie: .4+ to maybe .7+ and then starts over. It does change the frequencies while doing this. The readout may show just some of the numbers at times, or all of them but not on the VFO settings. I was wondering if this is a problem common to this animal. Where I live, there is no repair shops around without driving 50+ miles. Beside social security doesn't like them.
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WB2WIK
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Posts: 20635




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« Reply #1 on: April 02, 2009, 08:34:03 AM »

The TS-820 doesn't have any sort of scan mode.  It's an analog rig with a VFO.  The frequency counter is a display that has nothing to do with frequency control...

Sounds like either your VFO is drifting wildly, or if not, the frequency is stable but the counter is wandering.

Which is it?
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KJ4GXN
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Posts: 8




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« Reply #2 on: April 02, 2009, 08:44:20 AM »

When the counter is scanning the frequency is changing also. I can go to
14.300 where there is usually some action, and tune it in dead on with the
VFO when it is not scanning, but the counter may show something altogether
different and not all numbers show up, or are wrong. I used to be able to
just turn it off and back on and it corrected itself
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WB2WIK
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Posts: 20635




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« Reply #3 on: April 02, 2009, 09:06:20 AM »

14.300 is the maritime net, it's always there.

But it might be more useful to tune into a steady carrier like WWV at 10 MHz.

Then, listen carefully to the beat frequency and watch the frequency counter on the 820 at the same time.  Does the counter change but the beat stay the same, or does the beat actually drift along with the counter?

If the beat drifts along with the counter, you have a VFO problem.

If the beat stays the same and the counter frequency drifts, you have a counter problem -- which is much more common.

WB2WIK/6
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KJ4GXN
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Posts: 8




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« Reply #4 on: April 02, 2009, 09:17:49 AM »

Well, the beat is steady and the counter stayed stable, but shows 14.--6.6. It isn't doing any scanning now, but is incorrect reguardless. The next time it is it's scan mode, I can go there to check again. As a tech. class these are things worth remembering from those in the know.

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AI7RR
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Posts: 164




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« Reply #5 on: April 02, 2009, 11:42:16 AM »

The counter is known to have issues from time to time. Here is a well documented fix for some issues I found after I bought my used 820S.

HERE IS SOMTHING YOU CAN DO IF YOUR
DIGITAL DISPLAY ON THE KENWOOD TS-820
IS GIVING YOU A PROBLEM..............

 1 -- REMOVE THE COUNTER ASSEMBLY UNIT FROM THE 820.
 2 -- REMOVE BOTH CIRCUIT BOARDS FROM THE COUNTER ASSEMBLY (UPPER AND LOWER BOARDS).
 3 -- SCRAPE AWAY THE VARNISH FROM THE CORNERS OF THE BOARDS WHERE THE INTERCONNECTING SCREWES AND SPACERS HOLD THE BOARDS INTO THE CASE.
 4-- REASSEMBLE THE COUNTER....

 THAT SHOULD TAKE CARE OF THE PROBLEM..

Hope this helps.

73,, Roger
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KJ4GXN
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Posts: 8




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« Reply #6 on: April 02, 2009, 11:49:41 AM »

Thanks to everyone that has posted help information. I will try and take out the digital boards and clean them accordingly. I have a DOA ts130 to practice on first, as they look like the same hookups.
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N5EG
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Posts: 254


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« Reply #7 on: April 02, 2009, 02:04:44 PM »

TS-820 also have a problem with the rear VFO capacitor bearing getting oxidized aafter about 15 years. The symptom is that the VFO drifts pretty fast for about 20 KHz or so, and never settles down.

The fix requires removing the VFO, cleaning up the VFO capacitor bearings, and I think relubricating them with a small amount of conductive grease.

The voltage regulator in the VFO can also fail.

There's a good Kenwood mailing list on qth.net.  You may want to search the archives:

http://mailman.qth.net/pipermail/kenwood/

-- Tom, N5EG
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N2CST
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Posts: 15




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« Reply #8 on: April 02, 2009, 04:02:29 PM »

I had a similar problem with a TS530S. I found the solution to my problem on the internet. Try tightening all the circuit board mounting screws. I did that and the frequency gyrations ended.
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KE4DRN
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Posts: 3734




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« Reply #9 on: April 02, 2009, 05:11:31 PM »

Hi Harlan,

Wilson is correct, the 5xx/8xx series all
have common grounds on the pc boards.

after all these years the screws need to be
checked, loosen and then tighten them back up,
hand tight, you don't want to damage the pc boards.

A good cleaning is in order, some Deoxit brand
contact cleaner on the pins for the counter board
can help, also a few drops of light oil for the
cooling fan.

You can also use a small drop of Deoxit on the
vfo contact as well, more info in the group below.

http://groups.yahoo.com/group/TS-520_820_530_830/

Operating and service manuals are here in PDF

http://www.n6wk.com/kenwood/

73 james
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WB2WIK
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Posts: 20635




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« Reply #10 on: April 02, 2009, 09:20:52 PM »

And, Harlan, the TS-820 does *NOT* have any kind of "scan mode!"  It's not a scanner, and doesn't have this feature....

What you are describing is a problem with the frequency counter circuitry.  That's all.  Nothing to do with scanning.

WB2WIK/6
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KJ4GXN
Member

Posts: 8




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« Reply #11 on: April 03, 2009, 04:56:05 AM »

I want to thank everyone for the help I have received. As soon as my health squares away a bit, I will make the attempts on the animal. A steady hand is necessary. Thanks everyone, and will report back when I get it done. Harlan
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