Connect with us

Pioneer XC-L11 compact hi-fi...

Discussion in 'Electronic Repair' started by powerampfreak, Mar 28, 2007.

  1. Hi all,
    This unit came in the shop today. Unit refuse to start. When pressing
    power on, red led in power button flashes constantly, indicating a
    problem. Never had this unit before. Any advice is appreciated.
    A blown poweramp? Powersupply failure?

    Best regards
    The poweramp freak
     
  2. Arfa Daily

    Arfa Daily Guest

    Is this one of the units that has the glass display unit that sits on top?
    If so, the most likely cause of the problem is bad caps and bad joints on
    the transistors in the VFD multiplier module. This unit is located
    immediately behind the socket that goes out to the display unit, and is
    inside a metal can. Failure of those caps is common on models using the
    external display. I have also had fan failure on a couple of units from the
    XC-L series, which has resulted in just about all of the electrolytic caps
    in the output stages, located under the heatsink, drying out and failing.

    Arfa
     
  3. Thanks for your advice. This will be checked promptly.

    Reagrds
    Steve
     
  4. Hello Arfa!

    I opened the unit to check the VFD module. Then I saw some jumpers
    marked "service".
    Those were shorted during insertion of mains cord, and the unit
    started up correctly. Hmm....
    The display looked fine, though I don't know if the power amp operates
    properly..
    Does the above tell you anything?

    Best regards,
    Steve
     
  5. Arfa Daily

    Arfa Daily Guest

    Hello Arfa!

    I opened the unit to check the VFD module. Then I saw some jumpers
    marked "service".
    Those were shorted during insertion of mains cord, and the unit
    started up correctly. Hmm....
    The display looked fine, though I don't know if the power amp operates
    properly..
    Does the above tell you anything?

    Best regards,
    Steve

    Not really, except if the display is now working correctly, then the VFD
    supply module is not the cause of any problems. I'm not sure what you mean
    about whether the power amp operates correctly or not. If the unit now fully
    powers, with no error indications, and the speakers produce sound, then the
    assumption would have to be that the power amp is indeed working correctly
    ??

    Arfa
     
  6. Arfa, sorry for making you confused.
    I didn't check if the unit does output any sound yet...
    I just wonder how the set could start as soon as I shorted the service
    pins?
    Does this clear any internal error codes or something?
    I don't feel comfortable returning the unit to customer without
    finding any problem, except
    for shorting the service pins...
    Do you know anything that can set or cause an "error-detect" to the
    processor? Like dc from poweramp and such..

    Regards,
    Steve
     
  7. Arfa Daily

    Arfa Daily Guest

    Arfa, sorry for making you confused.
    I didn't check if the unit does output any sound yet...
    I just wonder how the set could start as soon as I shorted the service
    pins?
    Does this clear any internal error codes or something?
    I don't feel comfortable returning the unit to customer without
    finding any problem, except
    for shorting the service pins...
    Do you know anything that can set or cause an "error-detect" to the
    processor? Like dc from poweramp and such..

    Regards,
    Steve

    I can't recall ever having come across such on this particular model series,
    but I do recall having a Pioneer AV amp in for repair some time ago, which
    had done exactly that, and locked an error code into its processor, which
    permanently prevented it from powering, leaving just a flashing LED on the
    front panel. I had to put in a call to Pioneer Technical in the end ( who
    used to be absolutely excellent here in the UK - same two guys down there
    for years - but their department is sadly gone now ). They told me a
    button-push sequence that was required, and said that there was likely no
    other problem, which as I recall, there wasn't. Have you got the unit's own
    speakers in the shop with it, or are you using the shop test ones ? If you
    don't have the customer's own speakers, and it seems to work ok over an
    extended bench soak, I would give it back and tell them that it had an error
    code locked into it, and that this might have been due to a surge or
    micro-outage in their household supply, or might be due to a faulty speaker,
    or bad wiring to the speakers. Might be worth giving them a call before you
    declare it fixed, just to ask what, if any, the circumstances of failure
    were. I find that when I do this, I often get an answer like " Oh yes, it
    wouldn't come back on after someone put a digger through a cable out in the
    road - didn't I mention that .... ? "

    Arfa
     
  8. The thing is, the customer claims the unit was harder and harder each
    day to power on.
    In the end, they had to press several times on the powerbutton.
    This indicates some "capacitor" problem in my eyes... doesn't it?
    Maybe I would go for the checking the powersupply caps and poweramp
    caps,
    after checking the fuse is ok.
     
  9. Arfa Daily

    Arfa Daily Guest

    The thing is, the customer claims the unit was harder and harder each
    day to power on.
    In the end, they had to press several times on the powerbutton.
    This indicates some "capacitor" problem in my eyes... doesn't it?
    Maybe I would go for the checking the powersupply caps and poweramp
    caps,
    after checking the fuse is ok.

    I agree with your feelings about the cap. Going back to the VFD inverter, as
    it is a known source of trouble, which does stop the unit powering out of
    standby, particularly because of bad joints on the transistors, I might feel
    inclined to look there first, especially if the board is discoloured around
    the transistors. The caps which fail are just above the transistors, so are
    in streaming heat all the time. Could be that one of them is getting
    marginal, or could be that the joints are getting poor on the transistors,
    and when you had a look in there before, you disturbed them, which is why it
    then came on. Make sure that the fan is running ok if there is any sign of
    heat distress around the output stages. The couple I had where the fan had
    stopped, had a discoloured board, and the electrolytic caps just 'looked'
    stressed somehow - you know how you get a "feel" for these things when you
    work with them every day.

    Arfa
     
  10. "after checking the fuse is ok"
    ....Of course I mean after checking the fan is ok. Not the fuse, just a
    type error.
    I'll go for the VFD inverter, checking the stuff under the metal
    cover.
    Thanks a lot for your assistance, nice to have contact with other pro
    repair men!! :)

    Regards
    Steve
     
  11. Arfa Daily

    Arfa Daily Guest

    "after checking the fuse is ok"
    ....Of course I mean after checking the fan is ok. Not the fuse, just a
    type error.
    I'll go for the VFD inverter, checking the stuff under the metal
    cover.
    Thanks a lot for your assistance, nice to have contact with other pro
    repair men!! :)

    Regards
    Steve


    No problem, and please keep me posted on what you find. I do quite a few
    Pioneers, so all info, and other people's findings are always welcome for
    the archive.

    Arfa
     
  12. Hi Arfa,

    This Pioneer is making me nuts.
    The hardware seems all ok as soon as the Service pins are shorted
    once.
    After this everything works OK.
    After a few unplugs from the mains, the red led will flash when trying
    to start up unit.
    Maybe it's a problem with the micro controller itself, since the rest
    of the hardware seems to work just fine.
    Just informed customer this unit's repairprice will increase due to
    this strange behaviour....

    You don't have a contact at some Pioneer tech dept. for additional
    support?

    Regards
    Steve
     
  13. Guest

    Just for info
    I have the same Pionner model, and the same problem. If I power the
    system off and on for some times then the unit eventually works.
    But if I disconnect the display unit, the system always power on, but
    i wont be able to use it without the display connectet so it really
    don't helps.

    If somone find out the problem, please help me.

    brest regards
    Erik
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-