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Thread: Roland A-88 Mainboard Schematic Request

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    Roland A-88 Mainboard Schematic Request

    Hi.

    I need a schematic for the Mainboard of the Roland A-88. [5100029700]

    Specified i need the values for R9, R10 & L8.


    I broke the USB-Port when the keyboard hit the wall when USB was plugged in. :-(
    Thank you very much for any help.


    Greetings from Germany

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    Supporting Member Jazz P Bass's Avatar
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    Here is a crop of a typical Roland midi port.

    Roland Midi Ports.pdf

    The IN resistors are 120 & 100 ohm.
    The OUT & THRU are 220 ohms.
    The Inductors are N1608601T01 made by Maruwa.

    N1608Z601T01.pdf

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    Last edited by Jazz P Bass; 04-04-2016 at 11:42 PM.

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    Thank you for the fast answer.
    In this schematics the USB port is not shown.

    Maybe someone has an A-88 too and could take a photo of the Board.
    As I see it, the resistor values are printed on the parts.

    Roland support says that they are not able to tell me the values... A new board would cost around 150 and thats really disappointing.

    The missing parts cost only cents... :-(

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    Supporting Member Jazz P Bass's Avatar
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    OOOps.
    I had a senior moment.
    (Hey give me a break! I just turned 60)
    As I was working on a midi controller, I saw your post & thought.....MIDI.
    Anyway, try this.

    Roland USB.pdf

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    60 isn't old. You gained wisdom and now have the time and serenity to enjoy life

    Thank you veeeery much, this should help me out. I'll give feedback if I get the mainboard working again. Thank you so much and have a nice day!
    I have to do some soldering now

    Greetings from Germany

    Marcel

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    Quote Originally Posted by neelix136 View Post


    60 isn't old. You gained wisdom and now have the time and serenity to enjoy life

    Thank you veeeery much, this should help me out. I'll give feedback if I get the mainboard working again. Thank you so much and have a nice day!
    I have to do some soldering now

    Greetings from Germany

    Marcel
    Here is the USB port of the A-88.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	A-88 USB.png 
Views:	128 
Size:	59.4 KB 
ID:	38534  

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    Supporting Member Jazz P Bass's Avatar
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    So it appears that R9 & R10 are varistors.

    Panasonic Varistor.pdf

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    It worked!

    R9&R10 should be varistors (for first tryout I didn't replace them at all) and for L8 I just soldered a 0kOhm resistor (as it should just be a bead inductor).

    My PC recognized the A-88 again


    Thank you so much doctor and and Jazz P Bass!

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    Last edited by neelix136; 04-06-2016 at 11:22 AM.

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