[1000mp] Tuner malfunction

Sun Oct 12 16:04:48 EDT 2008

Hello Jerry,

My first attempt was to reflow the tuner PCB but without success.

Then I initiated to measure the signals and voltages and had seen that the 
communication between the radio and tuner was made via serial. The lines are 
SA and SB on J5002 on the CNTL-UNIT.

I placed a osciloscope in these two lines and the signals apparently were 
good. I followed the wiring until the tuner and the signals were there too.

Some time ago, I worked with serial communications and learned that the 
speed tolerance was some narrow. Then I thought what could be happening to 
cause speed errors, and the clock generator came in my mind. It was only 
luck to have thought about this

After I was direct to measure the frequency of the CPU clock and found 
sufficiently far from what it had to be. I was very happy and fortunately I 
have another crystal to change. BINGO! Everything came back to the normal.

To certify I came back to the original crystal and the problem returned, 
confirming that the cause of the problem was really the crystal.

In reality I called crystal but it is a 25MHz ceramic resonator, labeled 
CO5001 on the CNTL-UNIT diagram.

It was an uncommon failure therefore never had seen this type of problem in 
this type of part.

An yes, I hope to see you on the air some day!

73,
Marcus - PP5MS

----- Original Message ----- 
From: "Jerry Spring" <springjl at yahoo.com>
To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>
Sent: Sunday, October 12, 2008 3:02 PM
Subject: Re: [1000mp] Tuner malfunction

> Marcus,
>
> That is great that you found the problem.  I never
> would have thought of this.  How did you discover
> this?
>
> I'm glad your rig is working again and hope to see you
> on the air.
>
> Jerry
> VE6CNU
>
>
> --- pp5ms at pp5ms.com wrote:
>
>> Hello Jerry,
>>
>> Thank you for your sugestion..
>>
>> After some days work on the radio, I have found the
>> problem!
>>
>> The 25MHz resonator that generate the clock in the
>> radio CPU became out of
>> frequency.
>>
>> The radio CPU "talk" to the tunner CPU via serial,
>> and the baud-rate are
>> wrong because this resonator is out of frequency.
>>
>> Using a frequency counter I found 24.21MHz.
>>
>> After change the resonator for a new one, the
>> counter shows 24.98MHz and the
>> tuner start to work very fine again.
>>
>> I have returned the old resonator to the radio and
>> check again. The problem
>> came again, the tuner stop to work, confirming that
>> the resonatos are the
>> cause.
>>
>> Thank you and to all friends that have send me
>> sugestions to fix this
>> problem.
>>
>> Regards,
>> Marcus - PP5MS
>>
>>
>> ----- Original Message ----- 
>> From: "Jerry Spring" <springjl at yahoo.com>
>> To: "All about Yaesu 1000mp"
>> <1000mp at mailman.qth.net>
>> Sent: Monday, October 06, 2008 5:59 PM
>> Subject: Re: [1000mp] Tuner malfunction
>>
>>
>> > Marcus,
>> >
>> > I have owned an MP for 3 years now and it has only
>> had
>> > two problems while in my possession.  The first
>> one
>> > had to do with cold solder joints on the VXO board
>> (a
>> > very common problem), and the second one was a
>> sticky
>> > relay that wouldn't allow transmitting on 40m.
>> From
>> > the other comments here, as well as my own
>> experience,
>> > it sounds like another sticky relay or cold solder
>> > joint problem.  You are probably on the right
>> track to
>> > take out the tuner and reseat it - or at least
>> inspect
>> > the connections and relays for poor continuity.  I
>> > wish I could be more help.
>> >
>> > Jerry
>> >
>> >
>> > --- pp5ms at pp5ms.com wrote:
>> >
>> >> Hello Alex,
>> >>
>> >> Thank you for counting your experience with the
>> >> FT-1000MP.
>> >>
>> >> Reading the text, seems to me that the cause can
>> be
>> >> some bad-contact or
>> >> locked relay. I go to try to remove tuner outside
>> >> and to reflow the PCB.
>> >>
>> >> Can be some broken solder. Later I come back to
>> tell
>> >> if I have success.
>> >>
>> >> Thank you again!
>> >>
>> >> 73,
>> >> Marcus - PP5MS
>> >>
>> >>
>> >> ----- Original Message ----- 
>> >> From: "Alex Malyava" <alex.k2bb at gmail.com>
>> >> To: "All about Yaesu 1000mp"
>> >> <1000mp at mailman.qth.net>
>> >> Sent: Monday, October 06, 2008 4:58 PM
>> >> Subject: Re: [1000mp] Tuner malfunction
>> >>
>> >>
>> >> I had similar behaviour with my 1000MP (regular,
>> not
>> >> mark) for almost
>> >> a year about two years ago.
>> >> I also did everything I could - resetting it,
>> >> replacing battries etc -
>> >> it did not help.
>> >> I was about to send it for service along with a
>> few
>> >> other things like
>> >> broken push button I never use etc...
>> >>
>> >> I never did that and then I moved to my new house
>> >> and tuner started to
>> >> work again once in a while :)
>> >> I happened to have a vertical... It was around
>> the
>> >> time of VP6DX
>> >> expedition when I tried and finally worked them
>> on
>> >> 80m into barely
>> >> tuned antenna. There was some very familiar to
>> some
>> >> of us slight smell
>> >> of burning electric and dust and you know what?
>> That
>> >> tuner works great
>> >> since then...
>> >>
>> >> I dont know what happened - sticky relay shaken
>> >> durinng the move, or
>> >> excessive dust burned out. Who knows :)
>> >>
>> >> On Mon, Oct 6, 2008 at 3:35 PM,
>> <pp5ms at pp5ms.com>
>> >> wrote:
>> >> > Hi Jerry, I´m trying to explain, apologize my
>> bad
>> >> english.
>> >> >
>> >> > My rig work TX 100%, no problem if I not use
>> the
>> >> tuner.
>> >> >
>> >> > When the "Wait" comes on, the rig still
>> receiving,
>> >> like the PTT command is
>> >> > missing, the transmit don´t comes on to make
>> the
>> >> tune work.
>> >> >
>> >> > About SWR, I have test using a 50 ohms
>> dumy-load
>> >> an one antena at 1.5:1,
>> >> > but
>> >> > since the rig never turn on the transmitter
>> (via
>> >> tuner command) the tuner
>> >> > don´t know the SWR on the output. The "High
>> SWR"
>> >> never cames on.
>> >> >
>> >> > You ask me "is the tuner doing anything?". If I
>> >> leave the tuner ON and
>> >> > change the bands, I can listen the motors
>> inside
>> >> change the capacitors
>> >> > positions, nothing more.
>> >> >
>> >> > Summarizing, everything seems to be well, but
>> the
>> >> tuner don´t put the rig
>> >> > in
>> >> > transmission to make the tunning.
>> >> >
>> >> > If I use the rig without the tuner, all work
>> >> normal.
>> >> >
>> >> > I wait that my explanation has made to
>> understand
>> >> me, and hope you have
>> >> > some
>> >> > sugestion to me to try.
>> >> >
>> >> > 73,
>> >> > Marcus - PP5MS
>> >> >
>> >> >
>> >> >
>> >> > ----- Original Message ----- From: "Jerry
>> Spring"
>> >> <springjl at yahoo.com>
>> >> > To: "All about Yaesu 1000mp"
>> >> <1000mp at mailman.qth.net>
>> >> > Sent: Monday, October 06, 2008 2:51 PM
>> >> > Subject: Re: [1000mp] Tuner malfunction
>> >> >
>> >> >
>> >> >> Hi Marcus,
>> >> >>
>> >> >> I'm trying to understand the problem better.
>> I
>>
> === message truncated ===
>
>
>
>
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