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Author Topic: TS.850 owner in trouble  (Read 374 times)
IZ1MKZ
Member

Posts: 7




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« on: August 17, 2009, 12:16:55 PM »

My TS-850 suffered a stroke. Here is the story.
I just had completed a QSO on 7 MHz and everything was normal.
Switched to 14 MHz and could not resolve the stations - audio sounded like the wrong sideband.
Switched USB/LSB several times, no change.
Went to 7 MHz, everything fine.
Returned to 14 MHz and no audio - just the AF amplifier hum.
From that moment, same on every other band.
The receiver works on AM and FM, however. On SSB, it's dead.
The S-meter bar deflects normally indicating that the first stages are doing their job, but no audio.
On transmission, both the radio's wattmeter and my external tuner's meter deflect regularly. Did not check the transmitted audio quality.
Any idea ?
Thanks!

Enrico iz1mkz
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KK7KZ
Member

Posts: 464




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« Reply #1 on: August 17, 2009, 01:48:47 PM »

On speaker? Have you tried headphones?

Probably a dirty connection somewhere, the headphone jack may have a bad connection.

R.
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N9AVY
Member

Posts: 66




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« Reply #2 on: August 17, 2009, 04:55:23 PM »

I had something similiar happen last year.  There is a choke in series with audio output; it's towards rear apron on bottom.  Check that and if it appears burned, you should replace it.

Good luck.

73 ,  Jerry  n9avy
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N8MPX
Member

Posts: 7




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« Reply #3 on: August 17, 2009, 06:44:25 PM »

Enrico,

Here is a link to a site that has a lot of good information on the TS850. Take a look at the section on the carrier board cap leaking problem. This will cause all sorts of problems with the radio.

http://n6tr.jzap.com/850repair.html

good luck on getting your 850 back on the air.
73
N8MPX
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N4NYY
Member

Posts: 4758




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« Reply #4 on: August 18, 2009, 06:24:48 AM »

I got some good info from that site. It appears that that radio is notorious for leaking caps. My friend gave his TS-850 with a dead display. That site helped me find that a couple caps leaked on the display PCB, and ate away the traces. I fixed it with new caps from radio shack for $4. I wasn't aware they also had leaking caps on other parts of the radio. Might be a good idea to re-cap.
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