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Help...JVC AX 1010tn malfunction

Discussion in 'classic' started by salty dog, Mar 13, 2018.

  1. salty dog

    salty dog pfm Member

    HI Guys, My next post was about to be a tale of how (after a very hesitant start) my 1010 (bought Sept 2017) had sonically soared past my RSL'd naim 75 preamp and NAP 140.

    Unfortunately it has now developed a fault...

    anyone owning on e of these will know that the power button surround (normally) flashes when the button is pressed and then emits a loud click , at which point the flashing becomes a constant light and music will be heard from any source selected if the volume is up.

    At the moment this works as normal so long as no input is selected - as soon as source is selected and volume turned up the power button will click intermittently every 3=4 seconds, effectively turning the music on /off every few seconds. My hi fi is doing a good Norman Collier impression but is unlistenable.

    with my limited knowledge it seems the relay on the button is faulty but i have no idea otherwise. i have spoken to 5 ways hi fi in Birmingham who said it sounded problematic and that parts would be an issue...they didn't want to do it

    So any suggestions Advice gratefully received partcularly for likely bods to repair it. just for info it was bought as NOS from USA and is in obvious (outwardly) pristine condition - i use an airlink transformer to convert to UK voltage... the sound it produces is pretty damn good so i would be loathe to abandon it at this early stage

    many thanks for any help

    Dave
     
  2. Arkless Electronics

    Arkless Electronics Trade: Arkless

    That sounds like the protection circuitry kicking in, whether to correctly protect against a genuine fault or due to a fault in the protection circuitry itself.
    I've had a look at the circuit diagram and it does indeed sound problematic! There are many fairly hard to get/pure unobtainium IC's used and worst of all a microprocessor. I'm afraid this specific job is one I wouldn't want to take on. It could turn out to be fairly straightforward but there's too much risk (maybe 1 in 3 or 4) of after 8 hours work the problem is finally traced to an unobtainable part and that's the end of the line...
     
  3. flatpopely

    flatpopely Prog Rock/Moderator

    The relay clicking is the speaker one.
    Have you tried turning off both speakers on the front and seeing if the power stays on?
     
  4. jtrade

    jtrade pfm Member

    I think @toprepairman (Surrey location) was JVC trained & he’s definitely sorted a couple of Z1010TNs for pfm members.

    Must be some badly scratched s/h units around for parts...
     
  5. salty dog

    salty dog pfm Member

    thanks Guys - top repair man sounds like a useful lead. Flat is also right; with the speakers turned off at thefront the relay does not trip out the switch...
    cheers ok one step at a time...
     
  6. flatpopely

    flatpopely Prog Rock/Moderator

    Plug some headphones in with the speakers turned off, do you get audio.
    Also unplug the speakers from the back of the amp try turning it on with the speakers turned on.
    Could have a faulty speaker.
     
    jtrade likes this.
  7. salty dog

    salty dog pfm Member

    Blow me!! - Flat/arkless inspired me to fiddle with the speakers as maybe it is just the protection circuitry (correctly) kicking in. all i did was undo and resite the speaker connections and check the shahinians fuses (seemed ok) and it seems to be cured. My fingers are very crossed.

    Cheers everyone i would never have guessed otherwise

    Dave
     
  8. Arkless Electronics

    Arkless Electronics Trade: Arkless

    Maybe a strand of wire shorting then...
     
  9. salty dog

    salty dog pfm Member

    looks like it... :) It could've been decidedly gloomy
     
  10. divedeepdog

    divedeepdog pfm Member

    If they’re anything like Arcs I’d recommend Naim plugs at the speaker ends

    Good news many other amps will be fried.
     
  11. Arkless Electronics

    Arkless Electronics Trade: Arkless

    Yep. Accidentally allowing strands of wire to short together at amp or speaker end is one of the most common causes of a blown SS amp. Valve amps will survive it no problem.
     
  12. flatpopely

    flatpopely Prog Rock/Moderator

    Good job the JVC is a superb design!
     

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