Kenwood L1000T Tuner with Bad Display

Discussion in 'Tuners' started by Hi-FiGuy, Dec 5, 2016.

  1. Hi-FiGuy

    Hi-FiGuy AK Subscriber Subscriber

    Messages:
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    Location:
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    A friend of mine has a Kenwood L1000T Tuner that he loves and wants to repair it. The display does not light up except for 4 tiny dots. Does anyone have or knows where to get a display? Thanks!!
     

     

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  2. Joedeletang

    Joedeletang New Member

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    Hi
    I have the same problem.I've heard that this the Achille's heel of this tuner.
    This tuner is very well built and worth to repair it.
    I'm looking to get a new display (Part N° FIP8AMW8) but didn't succeed (my google seems to search only in France).
    But maybe the display coulb be repaired ?
    I've been said that Kenwood can help finfing this part but I didn't succeed getting the Kenwood adress (only kitchen equipment) where to ask.
    I need some help as well.
    Thanks in advance
    Regards
     
  3. Joedeletang

    Joedeletang New Member

    Messages:
    3
    I 've just had an idea.
    As it a VFD (vacuum fluorescent display) and th eproblem is that there is no more parts available, the only try would be to find a company that is able to redo the vacuum ?
    Am I missing something ?
     
  4. rcs16

    rcs16 Super Member

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    Big problem with this display technology, custom designs. Consumer couldn't be happy with LED :) that are cheap and easy to replace.
     
  5. Joedeletang

    Joedeletang New Member

    Messages:
    3
    Hi
    This is a pity because this tuner is very well build, has very high performances and very good sound.
    I was not able to find the part to replace (FIP 8AMW8) from France (Google, Yahoo searchs are not very effective and work in your country). I guess that pals in the US will be find this part more easily?
    I have 2 suggestions for high skilled technicians :
    - 1 - Would it be possible to redo the vaccum in the display, since it seems to be the problem ?
    - 2 - Is it possible to use a led display in place and put a controler (type Arduino) in front of the display in order to get again the display of informations ?
    I know it is a little bit complicated, but not impossible. But I have not the skills to do that myself.
    As there are a lot of these nice tuners Kenwood L-1000T with this display problem all around the world, there is a market for it.
     
  6. rcs16

    rcs16 Super Member

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    3,791
    Location:
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    need to be certain that it is the vfd in the first place, it could be the driver or something else.
    1. I have no idea if this is possible or feasible.
    2. It is possible but it is a timely task and the mechanical looks would probably be compromised. If you had the skills it would certainly be a great project. To have to pay for someone to do a re-design of the display, it would be expensive and probably be more $ that what the unit is worth.
     

     

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  7. Punker X

    Punker X Moderator Moderator Subscriber

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    Sometimes with some research you can find another tuner with the same display. Example.. Kenwood KT-5020 uses the same display as a KT-880D. Means scouring manuals for part numbers. Suggest hifiengine.com
     
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  8. rcs16

    rcs16 Super Member

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    3,791
    Location:
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    Hint, see what tuners were made in the same time frame, as they have the best chance of having common components.
     
  9. Nick_G

    Nick_G Active Member

    Messages:
    494
    Location:
    Whitchurch, Hampshire, UK
    I think the L-1000T dates from the same time period as the KT-5020 and 7020 tuners, but it uses a different display with, for example 7 vertical bars in the signal strength/spectrum indicator, whereas the 5020/7020 displays have 5 bars. Even then the displays between the latter two tuners (which were from the same line) show some differences.
     
  10. rcs16

    rcs16 Super Member

    Messages:
    3,791
    Location:
    Baldwin, Ontario, Canada
    I looked at the schematic again to refresh my memory. Complicated beast. It is a shame that these fine tuners can not be fixed just because of one or more important components. Lots of special comps, with no stock, designed for the garbage can.

    Like I said before, what have you tested to determine that it is the vfd, (fl1)? I would hope you used a scope,monitored the drivers,ic3,4,check filament drive etc to come to this conclusion.
    Lots of fun to adapt another vfd to this one, trying to match all the pins, fun wow.

    I like picking up dead tuners on ebay :) hopefully for you, it does not come down to this. In time, more will die, hopefully because of other issues and make a spare available. I hate vfds for this reason, like real expensive obsolete incandescent lamps :)

    I have a crown fm1 that has a dead controller, real simple compared to a L-1000T. tl072 ;-)
    I got it going again with a heli-pot to adj the varactors, added a center tune meter on the ca3189 afc ckt and today I got a freq display running = yea, but it is a bit of work just to get here, designing a new pll tuner, code display is a much bigger job.

    So I can offer you ATtiny2313 code to display the frequency on a cheap lcd :) What pre-scaler is used? I can't find it now, sch are a bit hard to follow, need to print out to follow better.

    Good luck
     
  11. Hi-FiGuy

    Hi-FiGuy AK Subscriber Subscriber

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    I figured the display was still working since the dots on the graph still lit up. I did some checking of the power supply board on top of the chassis (X13-645X-XX). The voltages around Q9 were about half of what they were suppose to be. I did some looking around and noticed a couple of the radial capacitors had domed tops. I replaced C64, C43, and C42. Powered up the unit and the display was back!!
     
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  12. Ds2000

    Ds2000 All About every cool stereo component. Subscriber

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    Eureka, this may be the issue with many of them. Good to know, I have one which still works fine. Should the display croak, I'll look at those caps first.
     
  13. Ds2000

    Ds2000 All About every cool stereo component. Subscriber

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    Would you mind disclosing the values and voltages of the caps you replaced?
     
  14. Hi-FiGuy

    Hi-FiGuy AK Subscriber Subscriber

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    20180618_142839-1.jpg
    C64 = 330uF 50V
    C43 = 330uF 50V
    C42 = 330uF 25V
     
    Last edited: Jun 18, 2018
  15. Ds2000

    Ds2000 All About every cool stereo component. Subscriber

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    Thanks much!
     
  16. Punker X

    Punker X Moderator Moderator Subscriber

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    If you are in there with a soldering iron and you have suspect or known bad caps, isn't a good idea to replace them all?
     

     

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  17. Ds2000

    Ds2000 All About every cool stereo component. Subscriber

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    The three power supply caps and the one supercap are the real issue in here. The one 330/25 has blown its top. The new ones are higher temp units.
    I’m waiting on the 330/40’s and the .047/5.5 supercap to arrive.
    024E839E-D952-4055-901C-E18282D417B5.jpeg A0769310-FD09-40D7-9004-D29AF82F61A6.jpeg
     
  18. Bob@FM

    Bob@FM Active Member

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    Location:
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    ^^^ This. I would also replace the neighbor C65 (470uF 50V) for sure as a minimum. And also use 50V caps if 50V was standard there. The AC rectifier spikes are higher than the DC output.
     

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