[1000mp] Tuner malfunction

[Jerry Spring]

Marcus,

I never would have thought of checking the crystal,
but it just goes to show that nothing should be
overlooked.  Brilliant!

73 and CUL,

Jerry
--- pp5ms at pp5ms.com wrote:

> 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...
> >> >>
> 
=== message truncated ===