MarkBass BIG BANG voltage jumper preset

Discussion in 'Amps [BG]' started by PrfctBss, Dec 2, 2013.


  1. PrfctBss

    PrfctBss Previously Duffffy Supporting Member

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    hey ,

    does anyone have some infos ? service manual ? or just inside pic of the head with 240V 60Hz configuration ?

    i need to switch from 120V to 240V.
    there is cn1 cn3 cn6 and cn9 jumpers .

    this is pic of US 120V preset : [​IMG]

    thanks for any help
     
  2. Downunderwonder

    Downunderwonder

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    Are you sure? Looks like it is set for 230/240v to me, but don't take my word for it!

    My GK mb200 has a set of three pins out of circuitboard with a jumping female socket, pull off and move across, makes yours a bit of a mystery.
     
  3. PrfctBss

    PrfctBss Previously Duffffy Supporting Member

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    you know , this was bought as used from USA ,ive opened it and i think no one opened it before. also it is labeled as 120V .

    im confused about label of the pins , but if cn1 have settings for 120 / 240 V then if i pull it out , it maybe goes for 240V . but i dont know. need some input. dont want to burn that baby .
     
  4. PrfctBss

    PrfctBss Previously Duffffy Supporting Member

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  6. Downunderwonder

    Downunderwonder

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    It's not a common amp on TB. You might try searching owners and sending some PM requests for pics. I found info on lmII but it's different again.
     
  7. InsanityAmps

    InsanityAmps Supporting Member

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    Did you try contacting MarkBass?
     
  8. Downunderwonder

    Downunderwonder

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    Markbass don't support changing the voltage.
     
  9. PrfctBss

    PrfctBss Previously Duffffy Supporting Member

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    yeah. they dont support that. its about law things.

    i dont understnad about this voltage things from markbass. theres so many other brands , they put the small voltage switch on the back side and everyone is happy. this stupid jumper way
     
  10. Downunderwonder

    Downunderwonder

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    It's for keeping 240v markets under control of local distributors.
     
  11. PrfctBss

    PrfctBss Previously Duffffy Supporting Member

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    i know . but what about aquilar ? th500 have nice switch , you can choose and everything is fine.

    what about tc electronic . th450 works automatically on both voltage nets.
     
  12. Downunderwonder

    Downunderwonder

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    Markbass is Euro selling into USA and Australia, small margins in USA, big margins in Aussie, makes keeping the voltage flip underwraps important for all markets.
     
  13. teemuk

    teemuk

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    I have a few Parsek "service manuals". Be warned, though: The word "service manual" is a huge overestimation of what that crappy Parsek SRL documention is all about. Most of them are namely pictures that show how to dissassemble and reassemble printed boards. No parts lists, no schematics, very little anything that could help other servicing than just replacing faulty circuit boards with working circuit boards. Anyway, I can check if they have any information but I don't have high hopes.

    Parsek also doesn't share their documentation to anyone, except qualified service personnel.

    At least in the Little Mark II board the voltage selection has to be made by soldering or desoldering certain "bridged" parts on the board. No jumpers in that one. There are at least 4 voltage options and some 3 or 4 bridges that need to be altered in various ways to achieve the correct outcome. Total mess!

    Anyway, I see what I can dig up.
     
  14. teemuk

    teemuk

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    Ok, I browsed through the tiny collection of Parsek service documents I have in my possession. I only have documentation concerning power supply modification of DA-500 or DD-800 boards.

    In these the voltage is selected by the aforementioned method of soldering or unsoldering about three to four "bridges" to specific places underneath the board. They feature no jumpers for quick and easy setup.

    Schematics I find only for DA-500 SMPS/PA.

    This is all I can help.

    What circuit board module does the Big Bang use?
     
  15. PrfctBss

    PrfctBss Previously Duffffy Supporting Member

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    huh , dont ask me about module supply . i can make pics of it.

    when you look at photo , there is jumpers labelled. i know , that it is easy . :)

    i make this modification on my f1 head and it was just pop off one jumper and its working nice.



     
  16. Feral Feline

    Feral Feline Supporting Member

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    I would have gladly bought Markbass, but for the voltage issue. So, Markbass' tight grip to maintain control squeezed out this potential customer. I wonder how many sales Markbass has lost because of this small point and whether Marco De Virgiliis & Co grasp that.

    I'm sure there's more to it than meets my eye, nonetheless – Interesting thread...
    Quite happy with my EA Micro, which switches automatically.
     
  17. Pimmsley

    Pimmsley

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    Me too...

    Edit: also inspired other choices and I could not be happier.
     
  18. PrfctBss

    PrfctBss Previously Duffffy Supporting Member

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    teemuk : thanks for your reply. try to look at the pics.

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]
     
  19. PrfctBss

    PrfctBss Previously Duffffy Supporting Member

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  20. Downunderwonder

    Downunderwonder

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    Check the new big bang thread for actual user you could PM.
     
  21. PrfctBss

    PrfctBss Previously Duffffy Supporting Member

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