Casio AP-60R not functioning

Discussion in 'Casio Keyboards' started by Trebor51, May 12, 2018.

  1. Trebor51

    Trebor51

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    I have a Casio Clavia AP-60R that I purchased secondhand about 8 years ago and it has just gone dead. It has the main power light on and the speakers punch up each time I switch on but no power to the display or other buttons. I have replace a fuse on the main PCB and have tested the transformer and it looks to be working ok although one of the secondary orange wires has a lower voltage. I have with closer inspection now noticed that two diodes connected near the fuse that blew have a crack in them, so I am assuming that they are the cause? They have no ohms reading but I don't know if they are supposed to. I left off the earth from the main PCB to the transformer and switched on only to trip the fuses in my house? I placed the earth lead back onto the transformer and switched on again and all was well but still not working to the display. So the power shortage is going directly to earth when it can without shorting out my house.
    I tested some other diodes on the board and they all read about 0.56. Also I have noticed that several of these diodes have red markings by them along with a couple of resistors so I am wondering if this might well have been a problem before and it has already been repaired once before. If anyone has any further information that I can use I would be grateful. I am waiting to obtain some replacement diodes that I found on ebay and when I get around to replacing them I will post to let others know how I went>
     
    Trebor51, May 12, 2018
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  2. Trebor51

    SeaGtGruff I meant to play that note! Moderator

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    SeaGtGruff, May 12, 2018
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  3. Trebor51

    Trebor51

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    Yes, I managed to download a copy. Thanks. Very helpful to know the schematics.
     
    Trebor51, May 13, 2018
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