I have a Problem with certain Marshall Amps. JCM2000 DSL and TSL.

Discussion in 'Marshall Amps' started by custom53, Jan 15, 2020.

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  1. custom53

    custom53 Well-Known Member

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    Both of those amps blew out the Main Fuse's. And I don't play them that much and only at home in practice. I don't know why the fuses blew. They blew when the amps were not being played. I have never had any of my other Marshalls blow a fuse. Just these two. They only take a 4 or 5 amp main fuse. I replaced them both. The DSL is back to normal and plays fine. The TSL keeps blowing the fuses. THe TSL blew the 5 amps fuse as soon as I replaced it and powered it back on. THen I put a 10amp fuse in and it blew that one. I finally put a 20 amp fuse in it and it didn't blow. But I'm too nervous to play it with going that much over the normal amperage. I don't know why it is acting like that. Or even why they both blew the main fuses when they weren't turned on. But the DSL is okay again. Not sure why the TSL is still acting like that..
     
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  2. Dogs of Doom

    Dogs of Doom Moderator Staff Member

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    can you check R6 & R9?

    AmpMad has the typical pull the tubes & test the sockets, I'll go find one of his posts...
     
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  3. JacksonCharvelAddict

    JacksonCharvelAddict Well-Known Member

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    Were they plugged in to power but turned off?
     
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  4. Dogs of Doom

    Dogs of Doom Moderator Staff Member

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    here, I found it...

     
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  5. Dogs of Doom

    Dogs of Doom Moderator Staff Member

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    also C46...
     
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  6. Lance Chambers

    Lance Chambers Well-Known Member

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    Throw them in the dumpster! :erk:
     
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  7. Gunner64

    Gunner64 Well-Known Member Premium Member

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    And I'll pick them out of the dumpster. ..and fix them. A properly functioning 2k dsl rips. I used to dog them too..until I got one cheap enough to make right. Night and day from the fizzy pos an amp in need of service is. Bias drift and Under $300? Shit I'll buy as many as I can find. imo an easy repair. I ain't afraid of no bias drift.

    And to the op that's maybe what you have going on and didn't realize it. Follow the mad ampers posts on the subject. He explains the testing proceedure pretty good.
     
    Last edited: Jan 15, 2020
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  8. Ken Underwood

    Ken Underwood Well-Known Member VIP Member

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    What a totally stupid thing to do replace a 5amp fuse with a 10amp fuse and then as it blew replace it with a 20amp fuse.

    I think that this must be a total wind up as no one would be that stupid
     
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  9. Adieu

    Adieu Well-Known Member

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    Mains fuse not HT fuse??

    Hmm wasn't bias drift an HT fuse thing, usually? Correct me if I'm wrong

    Perhaps you need a surge protector or something? DSL and TSL are closely related circuits, it'd be unsurprising if they reacted the same way to being plugged into an outlet with unstable voltage
     
  10. Gunner64

    Gunner64 Well-Known Member Premium Member

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    I Missed that part in my quick read at work ... yes pretty stupid. Why does he think they're in there for in the first place?. Yea..he needs to find a tech quick before he burns his house down.
     
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  11. ampmadscientist

    ampmadscientist Well-Known Member

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    Start the reactor... Free Mars!
    "I finally put a 20 amp fuse in it and it didn't blow."

    :nono:
    Is this guitar playing, or arc welding?

    "I have a Problem with certain Marshall Amps."

    Sounds like a lot more than just Marshall Amps...
     
    Last edited: Jan 15, 2020
  12. Matthews Guitars

    Matthews Guitars Well-Known Member

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    You NEVER replace a blown fuse with a fuse of larger amperage! Congratulations, you probably just turned a minor problem into a major one.

    DUMB.

    Hell, stick a drywall screw in the fuse socket and don't forget to wrap it in aluminum foil while you're at it! That isn't likely to blow, and your amp may make sound again. Not sure you'll LIKE the sound of a power transformer bursting into flame, but it'll be a sound, anyway.

    The fuse is there to protect the expensive components. Putting in a bigger fuse ensures that they're NOT protected.

    You may have just had a shorted power tube. Now you probably have bad power tubes and a bad transformer, too.
     
  13. Jethro Rocker

    Jethro Rocker Well-Known Member Premium Member

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    Agree with all above. Also, they had to have power on to blow a fuse. Nothing can blow a fuse with no power. Take to a tech. A TSL is a killer toned amp. It's obvious it's beyond your tech level. Why does it have a 5 Amp fuse to begin with? To replace with a 20?
    Crazy, man.
    Replace the breakers in your house with 60 amp ones. Watch it burn!!
     
  14. Michael Roe

    Michael Roe Well-Known Member

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    Take it to an amp tech before you hurt yourself!
     
  15. Matthews Guitars

    Matthews Guitars Well-Known Member

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    And put the original fuse back in it! If the tech sees a blown 20 amp fuse in the amp he's going to have a conniption. He'll probably figure it out anyway, if the damage is as bad as I suspect it must be.
     
  16. soundboy57

    soundboy57 Well-Known Member

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    Funny as hell, right here.
     
  17. ricksdisconnected

    ricksdisconnected Well-Known Member

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    stupid is a very harsh word here. i can think of many other proper words to use rather than stupid.
     
  18. Jethro Rocker

    Jethro Rocker Well-Known Member Premium Member

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    To put a 20 amp fuse in a 5 amp circuit?
    Interesting?
    Clever?
    I dunno, man...
     
  19. ricksdisconnected

    ricksdisconnected Well-Known Member

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    uneducated on the topic is where i would start.
     
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  20. Jethro Rocker

    Jethro Rocker Well-Known Member Premium Member

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    Fair enough.
     
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