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Need schematic for Realistic 31-2020A graphic equalizer

Discussion in 'Troubleshooting and Repair' started by Quikfix, Feb 21, 2018.

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  1. Quikfix

    Quikfix

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    Feb 21, 2018
    screen has all LEDs on all the time. An old post indicates they had an issue with a series transistor in the negative supply, but that doesn't really help much... :)

    If anyone knows where I can find it or post the pdf that would be great.

    Thanks!
     
  2. KilgoreCemetery

    KilgoreCemetery

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    13
    Apr 12, 2017
  3. 73's de Edd

    73's de Edd

    3,121
    1,315
    Aug 21, 2015
    Sir Quikfix . . . . .

    If lightning actually has struck twice . . . . your same fix would be:
    The marked in RED BOX . . . as being PNP pass transistor Q504.
    BUT . . . an additionally blown R512 fusible resistor or shorted D503 Zener diode are equally being suspect.


    RELEVANT SCHEMATIC SNIPPET . . . . .

    upload_2018-2-21_3-7-32.png



    73's de Edd
    .....
     
    Dougnsalem likes this.
  4. Quikfix

    Quikfix

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    Feb 21, 2018
    Thanks very much! That's very helpful... it's hard to find a good (reliable, without spybots) website... looks like HIFI is not a scam/virus infested site. I was able to create an account and download the manual/schematic. I had forgotten that Realistic used to include their schematics on a bunch of their user manuals. Wish others did the same...
    Thanks again.
    Quikfix
     
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