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In desperation! Roland E600 startup fault.

Discussion in 'Troubleshooting and Repair' started by NickCann, Aug 10, 2019.

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  1. NickCann

    NickCann

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    Aug 9, 2019
    I am pleased to have been accepted in this website, so thank you very much!
    I am 73 years old, and an ex-musician...only because I am too old :D
    I have a wonderful Roland E600 synthesiser, which I have owned for quite a while. It is all I have now, and can't afford a new one, so I am hoping somebody can give me a clue or two what is wrong with it.
    It worked fine every time I turned it on, but last week, when I pressed the power button, the touch sensitive display panel just stays flashing on and off, very rapidly.
    I tried to find a method to reboot the computer side, but without luck. And so, having repaired many electrical devices down the years, I opened her up. Firstly, looked at the power transformer board, which accepts 220 volts ac, and reduces the volts according to whichever section it is supplying. I checked very carefully for swollen caps etc, but couldn't see anything out of the ordinary...although that probably doesn't mean much!
    I then progressed to the power board...same result...no distorted caps. Main amplifier board also looks ok. I had turned the power off a few minutes prior, for safety sake, but noticed that on another board, which has no specific name, there are several large chips, and 2 of them were still very warm to the touch. So now I am wondering if they, or a controlling component, has/have failed. Now, I know these chips are like hens teeth nowadays, because the keyboard is old....but I would really love to get it working again, if possible. Being in Spain, it would be too expensive to ship the whole kwyboard to anybody who might be able to repair it, so...I will try myself, and if it isn't possible, afraid I will have to chuck it away...with the other sitting under my bed: Solton MS60, which requires at LEAST a new chip, costing 185 pounds...if I can even locate one.
    I can provide photos of pcb's and components, if that might help, and also a short video of the display screen misbehaving!
    Looking forward to any kind of advice, even if it is 'chuck it away'! It is otherwise in pristine condition... I love my instruments,
    Thank you so much for any and all advice and comments.
    Respectfully
    Nicholas Cann.
     
    Last edited: Aug 10, 2019
  2. NickCann

    NickCann

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    Aug 9, 2019
    found the problem, and resolved it. The fault was a dry joint on the internal power supply. Did a blanket solderjob on the PCB, turned it on, and Bingo! IN BUSINESS AGAIN!!
     
    73's de Edd and Martaine2005 like this.
  3. NickCann

    NickCann

    5
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    Aug 9, 2019
    Back from the dead!!
    Not long after I got it going again...it did it again.

    So I left it on by accident( getting even older :( ) ,and when I went back to it the following day..it was working again. But not for long.
    I put it away again, and forgot all about until...until we moved house. Still doesn't turn on properly, but the screen just sits and blinks at a high rate of knots.
    I just disconnected all the cables from the power supply board, except the one to the Gotek floppy simulator. The display was still flashing on it, so I am convinced it is still the power board which is the problem.
    From this rather hazy description, can anybody suggest which component (s) might have failed? I am pretty sure there is not enough current being provided, to actually boot it into life!
     
  4. bertus

    bertus Moderator

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    Nov 8, 2019
  5. NickCann

    NickCann

    5
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    Aug 9, 2019
  6. NickCann

    NickCann

    5
    2
    Aug 9, 2019
    I seem to remember when it worked properly, when I powered it up, there was an audible 'click' from inside. Having viewed the service manual you so kindly linked for me, could it be the AC/DC power converter that used to click, and has now failed?
     
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