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JVC CA-UXP55 HIFI Problem

Discussion in 'Electronic Repair' started by Billy Brainstorm, Sep 11, 2012.

  1. Hi,
    This unit failed to power up. Removed case and found the internal 1amp slow blow fuse (T1AL) was shot. replaced fuse turned power on power to unit successful as unit goes into standby mode red light on front and clock displayed.
    As soon as the unit is turned on proper the Fuse blows again.
    I am a novice at this sort of thing but did some rudimentary checking on the board that the transformer is attached to looking for blown capacitors ora short of some kind, can anyone suggest a way forward. I am thinking it cannot be that much wrong with it as initail power up is ok?
    I would rather attempt a repair than put it into a shop as the cost of repair would probaly outweigh the value of the unit. any help? suggestions?

    Cheers
    Billy
     
  2. N_Cook

    N_Cook Guest

    Hi,
    This unit failed to power up. Removed case and found the internal 1amp
    slow blow fuse (T1AL) was shot. replaced fuse turned power on power to unit
    successful as unit goes into standby mode red light on front and clock
    displayed.
    As soon as the unit is turned on proper the Fuse blows again.
    I am a novice at this sort of thing but did some rudimentary checking on the
    board that the transformer is attached to looking for blown capacitors or a
    short of some kind, can anyone suggest a way forward. I am thinking it
    cannot be that much wrong with it as initail power up is ok?
    I would rather attempt a repair than put it into a shop as the cost of
    repair would probaly outweigh the value of the unit. any help? suggestions?

    Cheers
    Billy

    ++++++
    Checked the speaker wiring ?
    What is the output device/s ?
     
  3. didn't have the speakers connected.
    heres a link to give you an idea of the unit in question
    http://www.jvc.co.uk/files/instruction_manual/gvt0105-008a.pdf
     
  4. thanks for the reply
    have taken unit apart to investigate further cannot see any obvious short
    the small board seems basic (says i the novice so please excuse my ignorance )
     
  5. i will try and post a few pictures if it may help maybe the sages on this site can nurse me through a little more investigation?
     
  6. links to pictures....
    http://i1148.photobucket.com/albums/o573/BillyBrainstorm/JVC+CA-UXP55+Power+motherboard/a420684f.jpg
    http://i1148.photobucket.com/albums/o573/BillyBrainstorm/JVC+CA-UXP55+Power+motherboard/e039b327.jpg
    http://i1148.photobucket.com/albums/o573/BillyBrainstorm/JVC+CA-UXP55+Power+motherboard/d667ae55.jpg

    thanks for looking... the blown fuse is in top left of the board mains input goes into the socket near it.
    tips on how to try and trace the fault would be good, is the board relatively simple?

    Cheers Billy
     
  7. http://s1148.beta.photobucket.com/u... CA-UXP55 Power motherboard/d667ae55.jpg.html
    http://s1148.beta.photobucket.com/u... CA-UXP55 Power motherboard/e039b327.jpg.html
    http://s1148.beta.photobucket.com/u... CA-UXP55 Power motherboard/a420684f.jpg.html

    re try of the photo links!
     
  8. Thanks for your help and the pointers re the fuse.
    I havent had time to look again but will over the weekend, looking like a replacement transformer But probably not worth the cost.
    Thanks you very much for your help.
    You never know i may have something else thrown at me to fix and i may ask for more help in the future.
    take care

    Cheers
    Billy
     
  9. Franc Zabkar

    Franc Zabkar Guest

    Direct links to your photos ...
    http://i1148.photobucket.com/albums/o573/BillyBrainstorm/JVC CA-UXP55 Power motherboard/d667ae55.jpg
    http://i1148.photobucket.com/albums/o573/BillyBrainstorm/JVC CA-UXP55 Power motherboard/e039b327.jpg
    http://i1148.photobucket.com/albums/o573/BillyBrainstorm/JVC CA-UXP55 Power motherboard/a420684f.jpg

    Page 8 of the following UX-P5 circuit diagrams looks very much like
    your power supply board. The P/N of the main transformer is the same
    in any case.
    http://www.go-gddq.com/upload/2009_07/09071710066960.pdf

    UX-P5 Service Manual:
    http://www.go-gddq.com/upload/2009_07/09071710075498.pdf

    The following link looked promising, but it has expired:
    http://jvckenwood.com.au/jvcfiles/UX-P7#SCH1.pdf

    Here is another service manual, but it looks quite a bit different:
    http://service.eclubthai.com/new/audio/JVC/UX-P550U.pdf

    - Franc Zabkar
     
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