Tuner ALPS BSBE2-401A, no signal problem.

Discussion in 'General information.' started by Johnny B., Apr 16, 2021.

  1. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Receivers that still use this tuner are quite old, but still alive with the many owners who still own one.
    So very annoying when the tuner suddenly gives the known no signal problem while you are sure that the dish and cables are not the cause.

    Then it can often help to do the 1000uf cap mod, but also the replacement of all 22uf / 16v caps.
    Even better is to replace it for the 226c smd capacitor as I often do.

    Like this ALPS BSBE2-401A RevK tuner, it still looks good, but it had the no signal problem.
    Dm800hd-tuner-recap-before.jpg

    Here I removed all caps and cleaned it.
    Dm800hd-tuner-recap-cleaned.jpg

    And here you see the end result, with all new 22uf/16v 226C smd capacitor, and the 1000uf/16v modification.
    Dm800hd-tuner-recap-after.jpg

    Is this always THE solution to this problem.
    Often yes, but of course not always.
    But I still get them in repair every now and then, and often with a bad, leaking or outdated cap, sometimes just one, but often more than one.
    In any case, it's a good start to recap the caps before continuing to search why it no longer works.

    The way I always remove the old caps, you can see here on youtube,
    Electrolytic Capacitor Removal NO Desoldering Required.
    See at 1:40 how it can be done.
     
  2. Aliraza63

    Aliraza63 Active Member

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    Nice and informative always .
    Kindly share your experience with Alps M 801A tuner also . I see still this tuner ( M801A) workable with Dm 800se , Dm 820 and Dm 7020,7080 series . peoples are using due to its sharp signal for weak tps .
     
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  3. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Strangely enough I had/have more often the older tuners in repair than the later Alps M 801A tuner.
    But I had repaired a few in the past, and according to my notes they needed mainly new 220uf/10v caps in the Alps 801A tuner.
    BSBE2-801A-caps.jpg
    Best is to use surface mount caps instead of the olds, or the tuner module must be removed from the board.

    But again, no guarantee that it will help for all these tuners, it's only based on my repairs of these tuners I had.
     
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  4. Aliraza63

    Aliraza63 Active Member

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    Its a Tuner M 801A
    before to changing its cap it was breaking signal and glitching over strong tp also . but after replacing the caps now its just showing signal but not storing tp even the signal is strong enough.
    is it due to caps replacement . ?
    1.jpg 2.jpg
     
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  5. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    It's not clear for me if you still have some issues after the re-cap, or not.
    But keep in mind that the sat finder dm plugin results depends on which channel you had set it.
    Also, the results it gives is not a accurate overview, nevertheless it's good enough to see some indication if there is something wrong.

    As for the re-cap, it often helps to get the signal back and it become stronger and stable.
    But the end result depends also on the quality caps you replace it with.
    Most important thing is to use the same values as before, as also when using surface mount caps it can handle something as 125°.
     
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  6. tomgr

    tomgr New Member

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    Hi!
    I have this trial tuner in my sr4 receiver.
    Terrestrial works but satellite has no signal. It does not apply voltage to the output. What could I do to fix it?
    Thanks!
     

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  7. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Tuner is recognized, but no satellite receptions, also not when you add the satellite channels list manually.
    Because I have never had this type of tuner repaired, I cannot give a direct answer.
    But measure the 12v dc parts up to the lnb ic, see this picture.
    If present, it could be the lnb ic and that is not so easy to replace due to the little space around it, and the ground pad under the ic.
    Otherwise it may be a defect in the (Alps) module of the tuner itself, and will be difficult, virtually impossible to attempt to repair.
    Replacement is often the best option.
     
  8. tomgr

    tomgr New Member

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    Thanks for the prompt reply.
    I will try to reset it and report back with the results.
    "Replacement is often the best option."
    Unfortunately, I've looked online but couldn't find it or if it exists it costs more than the receiver.
    Greetings!
     
  9. tomgr

    tomgr New Member

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    Ok.
    I did the measurements and what doesn't respond is that there is no voltage at pin 1 (RF input).
    The rest of the readings look fine.
     
  10. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    The LNB output voltage is only present when the box is on a channel, with or without reception and disconnected from the dish. So this pin may be inactive if it is not set to a channel.
     
  11. tomgr

    tomgr New Member

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    I connected it to the dish, i also selected a channel but still no voltage.
    In fact it showed approx 0.15V.
     
  12. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    voltage at pin 1, this is connected to the R514/L502 inductor behind the coil 271uh and the other side to the D102/D100.
    I think you can better check these.
     
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