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JCM600 fault

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  • ICBMICBM Frets: 72411
    DJH83004 said:
    First check - as per ICBM as always, but to get the front board out and change a pot is a fare old job on these, so double check all your interconnections.  
    Yes - especially the 3-wire jumper cable which feeds these fuses...

    "Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski

    "Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein

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  • ParkerParker Frets: 960
    I have had a general fiddle with connectors and changed fuses to no apparent joy (there are two internal fuses I could see without taking the boards out). Any more possible easy changes to components I could make before sending it away?
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  • ICBMICBM Frets: 72411
    If you have a multimeter, measure the voltages (to chassis) on the banded ends of D3/D5 and the plain ends of D2/D4 near those PCB fuses - they should be about +25V and -25V respectively. If not, the two fuses have probably blown.

    "Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski

    "Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein

    0reaction image LOL 0reaction image Wow! 0reaction image Wisdom
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