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TECHNICS SU-CH900

Discussion in 'Electronic Repair' started by ian_tech, Sep 10, 2004.

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  1. ian_tech

    ian_tech Guest

    Hi !! i have that mini hifi su-ch900 to repair but i got problem to find
    out the problem .
    The problem is when you turn up the music until the fan start , the unit
    just shut down .
    I try to bypass the SVi output ic , still doing the same thing , i test
    almost all the part into PSU , no faulty parts .
    I am also looking for the schematic !!
    Please somebody help me !!
    thanks
    Ian
     
  2. Eugen T

    Eugen T Guest

    IMHO, all technics with this fan idea have this particular problem. My
    receiver also had this problem. It's usually fan getting stuck, so it can't
    spin right away. You're right, fan only turns on when system pumps at high
    power. I guess I was lucky because in my case my fan was a bit crooked and
    was touching walls a bit. IMHO, just put 60mm 5V computer fan in there and
    let it run - there are ultra-quiet fans available.
     
  3. loppan

    loppan Guest


    Ian!!!

    We have exactly the same problem, please mail us with alll possibl
    ideas of HOW to fix this problem. If anyone else knows.....I woul
    ever be so in debt!!!


    Sincerely

    Loppa
     
  4. Arfa Daily

    Arfa Daily Guest

    This problem is often caused by the fan motor itself - particularly if it's
    the Mitsumi ' spindle motor ' type. The commutator gets noisy so when the
    fan starts up, you get spikes which cause the sytem control micro to shut
    the unit down. One stated cure was to add a 0.1uF capacitor directly across
    the fan motor, but failing this working, a replacement fan is often needed.

    Hope this helps

    Geoff
     
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