Open Jmp-1 Chassis

Discussion in 'Marshall Amps' started by gbirocco, Jul 23, 2017.

Tags:
  1. gbirocco

    gbirocco New Member

    Joined:
    Jul 23, 2017
    Messages:
    3
    Likes Received:
    0
    The volume pot of my old JMP-1 is very scratchy and noisy so I would like to spray some switch cleaner into it. I tried to open the chassis. I have unscrew the 3 rear screws but nothing happened; I also have unscrew the six little screws on the golden edge (top & bottom) but nothing happened: it seems glued.
    How to open the JMP-1 chassis? Can you help me?
     
  2. marshallmellowed

    marshallmellowed Well-Known Member

    Joined:
    Jun 26, 2009
    Messages:
    3,476
    Likes Received:
    3,972
    Found this...

    "There are 3 phillips screws in the back and on on the top that must be removed. Then you have to remove 3 allen head screws from the rack mount ears (6 screws total) before it will come loose."
     
    Dogs of Doom likes this.
  3. gbirocco

    gbirocco New Member

    Joined:
    Jul 23, 2017
    Messages:
    3
    Likes Received:
    0
    Thank you for your answer!
     
  4. marshallmellowed

    marshallmellowed Well-Known Member

    Joined:
    Jun 26, 2009
    Messages:
    3,476
    Likes Received:
    3,972
    No problem, hope the info helped.
     
  5. Dogs of Doom

    Dogs of Doom Moderator Staff Member

    Joined:
    Aug 2, 2012
    Messages:
    20,814
    Likes Received:
    21,750
    Location:
    Los Angeles
    yeah, you have to remove the rack ears...
     
  6. gjohnson

    gjohnson Well-Known Member

    Joined:
    Oct 16, 2010
    Messages:
    992
    Likes Received:
    578
    Location:
    Denver CO
    While its open check for battery corrosion. Mine was leaking and almost destroyed the unit.
     
  7. gbirocco

    gbirocco New Member

    Joined:
    Jul 23, 2017
    Messages:
    3
    Likes Received:
    0
    I opened the chassis and I sprayed some cleaner: now the pot is silent, no more scratch!.
    The battery still looks good: It works fine since 1993!. Unfortunately it could not be replaced directly.
    Thank you for all guys!
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice