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Orange TH30 Channel Switching

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  • Orange TH30 Channel Switching

    Hi, I have another post about this in the electronics subforum. I have an orange TH30 that is switching unreliably from the front panel switch only without the footswitch plugged it. I thought it may have been the relay, but if it was, it probably wouldnít be working at all. Just wondering if anyone has any ideas of what it could be. I know a faulty jack could cause something like this. Itís a 3 tab cliff style jack. It says on the schematic that all 3 tabs should be grounded when there isnít anything plugged in, but the middle one doesnít ground at all. Itís probably a very simple fix but itís been kind of confusing. Iím not too familiar with these amps and their common issues. Thanks!

    Hereís a schematic: https://music-electronics-forum.com/...3&d=1521589896

  • #2
    Originally posted by Steelwitch View Post
    It says on the schematic that all 3 tabs should be grounded when there isnít anything plugged in,
    I don't see that anywhere on the schematic you posted?
    The relay or the switch could still be intermittent. Or a shaky solder connection.
    "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

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    • #3
      Sorry, I misunderstood the schematic diagram. After looking around a bit more thereís only 1.5vDC on the supply. Iím thinking C8 and C9 may be faulty. Iím going to replace them and see if the supply voltage looks closer to whatís stated

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      • #4
        Originally posted by Steelwitch View Post
        I’m thinking C8 and C9 may be faulty.
        Also C7.
        "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

        Comment


        • #5
          You can measure AC on the rectifier side of C8 and C9 to verify AC is getting to the rectifier without having to shotgun the caps.
          "Yeah, well, you know, that's just, like, your opinion, man."

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          • #6
            Replacing C8 and C9 did it. Supply is back up to 5V. Thanks yíall!

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