Event tria channel went out

Discussion in 'Troubleshooting and Repair' started by Frecoder78, Apr 16, 2018 at 2:30 PM.

  1. Frecoder78

    Frecoder78

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    I have this old even tria where one of the channels went out. You can head a faint sound in the monitor that is connected to that channel. I have already ruled out the monitors since i connected both to the channel that works. I have been testing most of the components on the board for contiunuity, resistance, and all the caps. I even replaced one of them thinking that would solve the issue. I am new at testing sound equipment but have some knowledge on circuit board layout. I even purchased a PC O-scope. Any help would be greatly appreciated. I have attached 2 pictures of the non-working channel and of the connections to the subwoofer. The arial shot I took in of the other working channel which is identical. Also a power transformer is missing from the picture since I had to remove it being so heavy.
     

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    Frecoder78, Apr 16, 2018 at 2:30 PM
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  2. Frecoder78

    WHONOES

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    Start by looking at the power supply voltages. Do a like for like check i.e. turn on the known working unit and use a DMM to measure PSU volts all referenced to 0V (assuming it is a split supply) then replace the transformer in the non working unit and switch on. If smoke doesn't try to escape and it doesn't do an imitation of central heating, then measure the PSU volts to see if they are the same.
    Checking power supplies is always a good place to start as they are quite fundamental.
     
    WHONOES, Apr 16, 2018 at 11:03 PM
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  3. Frecoder78

    Frecoder78

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    Great thanks for the tip! Let you know if that works!
     
    Frecoder78, Apr 16, 2018 at 11:05 PM
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