[Yaesu] FT1000MP overheating and audio failure

[Robert Shohet]

Hi Peter,

Thank you for your email, information and the great question.  I realize that I should have been more clear in my reporting of the “symptoms”.

There is a tiny bit of noise and I am not receiving any stations.  Even the spurs are barely audible.  But the radio audio is not completely “dead”.

I will try connecting the antenna to the separate RX antenna port.  I remember doing that once with an audio problem on the other radio – I had forgotten that diagnostic test.  Thank you for mentioning it!  I will check and let you know what I find.

73

Bob KQ2M


From: Peter Sundberg 
Sent: Tuesday, May 29, 2018 5:25 AM
To: Robert Shohet ; yaesu at contesting.com 
Subject: Re: [Yaesu] FT1000MP overheating and audio failure

Hi Bob,

When you say "NO audio" does this mean that the 
rig is totally muted or does it mean that the 
radios internal noise is present but you are not receiving any stations?

Try connecting the antenna to the separate RX 
antenna port and to see of the radio will 
receive. There are components in line with the 
ordinary antenna connector that will protect the 
input of the RX, and they are known to blow up if 
there is too much RF or some sort of surge on the 
input. These components are bypassed when an 
antenna is connected to the RX in and can fail in 
an open- or shortcircuit state which might affect the TX side of things.

In my case it was a surge from the 
amplifier  while I was in a contest on 160m that 
caused my problems. I did not realize it until I 
went to another band and the RX was dead as I was 
not using the RX In for receive on this band. 
Took me a while to figure out what was going 
on.  Yaesu in the UK had spare parts so I could repair the radio.

This may not be the same problem as you have, but 
it might help you in localizing the problem area.

73
Peter SM2CEW






At 18:57 2018-05-28, Robert Shohet wrote:
>Hi, While operating the WPXCW contest this 
>weekend, on Friday night my left FT1000MP began 
>to become warmer than the right radio.  Since I 
>have some antenna controllers partially blocking 
>some of the vents on the top of the chassis, I 
>didn’t think much of it until the radio did 
>not seem to want to cool off after I moved the 
>controllers away from the vents.  I thought that 
>this was odd since I wasn’t transmitting with 
>the left radio ­ and by conttrast, the right 
>radio was cool even though I was transmitting on 
>it almost continuously. Then, all of a sudden, 
>the left radio shut off by itself!  I pushed the 
>on button and it would not turn on.  Then after 
>~15 minutes, I was able to turn it back on.  But 
>it stayed very warm.  Hmmm...  This annoying 
>process repeated more and more frequently on 
>Saturday morning ­ turning itself off and then 
>hhaving to wait about 15 minutes before I was 
>able to turn it back on.  Finally, the radio 
>failed and when I turned it back on, there was 
>NO audio and the swr was infinite! Realizing 
>that there could be many potential failure 
>points, I took the coax from the left radio and 
>hooked it up to the right radio and everything 
>was fine ­ swr was llow, the left amp worked at 
>full power and everything was normal. Then I 
>took the coax from the right radio and plugged 
>it into the left radio and the swr was infinite 
>with NO audio. Clearly the left radio had the 
>failure not the amp or coaxial cables. Does 
>anyone know what might have failed and what 
>needs to be fixed? Tnx & 73 Bob, KQ2M 
>kq2m at kq2m.com 
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