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Fixing a fuse?

Discussion in 'Electronic Repair' started by ArctecJP, Sep 2, 2004.

  1. ArctecJP

    ArctecJP Guest

    Hi,

    I've got an old Laser Disc player that I want to sell on eBay. It used to
    work, but I plugged it in just to make sure and now it doesnt. Feeling brave,
    I unplugged it and opened it up. After much staring (I dont know that much
    about electronics), I found something that looked like a burnt out fuse. It
    has 125 V 2 A written on it.

    I pulled it out and went over to RadioShack. They didnt have a 125 V, 2A fuse,
    but told me that a 250 V 2A fuse would probably work. I bought it, stuck it
    in, inserted the plug into the back of the LD player and the fuse immediately
    burnt out. The pack came with 4, so I tried it again, just to be sure and got
    the same result.

    Should I try to find a 125 V 2A fuse, or are the fuses being blown for another
    reason? Where should I look first? BTW, I do own a multimeter or whatever
    that thing is called that will test resistence. (Yes, I am a beginner, but you
    gotta start somewhere, right?)

    Thanks for your help!
    JP
     
  2. There is something seriously wrong with the power supply in the LaserDisc
    player. Sorry, for once, the guy at Radio Shack gave you the correct advice.
    The fuse isn't the problem.

    --- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
    Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
    +Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
    | Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

    Note: These links are hopefully temporary until we can sort out the excessive
    traffic on Repairfaq.org.

    Important: Anything sent to the email address in the message header is ignored.
    To contact me, please use the feedback form on the S.E.R FAQ Web sites.
     
  3. Paul Cassone

    Paul Cassone Guest

    Subject: Fixing a fuse?
    If the fuse keeps blowing, you have a short somewhere in the unit. Continuing
    to replace fuses will assure (if you haven't already) that the unit is beyond
    repair.

    Paul

    Don't just sit there -- DO SOMETHING!

    PC
     
  4. ArctecJP

    ArctecJP Guest

    Hi Mr. Goldwasser-

    That was the fastest reply I think I've ever gotten.

    Okay, so the power supply is the problem. Is it fixable? Or maybe I should
    ask if its fixable by me?

    Thanks again,
    JP
     
  5. Tweetldee

    Tweetldee Guest

    The unit may, or may not be economically repairable. Only a qualified
    service shop can tell you at this point.

    Judging from your original post, and this follow-up, I'd suggest that you
    not attempt to fix this unit yourself. Take it to a service shop and get an
    estimate. They might not hit the exact cost, but will get pretty close to
    it. Modern power supplies are not for the electronically untrained. While
    they might be easy for a trained technician to fix, an untrained person can
    end up causing a lot more damage to the unit than exists now.

    Pay the price if you want it fixed.

    --
    Dave M
    MasonDG44 at comcast dot net (Just subsitute the appropriate characters in
    the address)

    Never take a laxative and a sleeping pill at the same time!!
     
  6. It is probably fixable but unless you want to spend time and effort - far
    more than could be justified since you would have a significant learning
    curve, it's likely not worth it.

    I'd guess that it has sit unused for several years and possibly some
    capacitors have dried up causing other parts to fail when you turned
    it on the first time. Unless someone else can provide tech tips on
    known problems, it would take some effort even by any of us.

    --- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
    Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
    +Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
    | Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

    Note: These links are hopefully temporary until we can sort out the excessive
    traffic on Repairfaq.org.

    Important: Anything sent to the email address in the message header is ignored.
    To contact me, please use the feedback form on the S.E.R FAQ Web sites.
     
  7. ArctecJP

    ArctecJP Guest

    Dang, that stinks. I didnt know electronic stuff could go bad from being
    unused.

    Well, its probably not worth my trouble to get it going again.

    Thanks anyway, everyone!
    JP
     
  8. Ampdoc

    Ampdoc Guest

    What brand player is this and what is the model # please.

    --
    Jammy Harbin
    J & J Electronics, Inc.
    227 S. 4th St.
    Selmer, TN 38375
    731-645-3311
     
  9. James Sweet

    James Sweet Guest

    Of course it's fixable, it's likely something quite basic. As for fixable by
    you, well do you have a multimeter, a soldering iron, and some idea of what
    to look for? If you have no clue there's still hope if you have the
    motivation to research and learn. It will probably not be economical to
    repair when time is factored in but the education will be worth it if you
    succeed.
     
  10. James Sweet

    James Sweet Guest

    Electronics can go bad at any time for almost any reason. There's lots of
    little things lurking just waiting to cause a failure. The most common is
    bad soldering, wish I had a nickel for every time I saw someone bang on
    something to get it working again or just ignore an intermittant problem and
    continue using something until the minor problem causes a large failure.
     
  11. If you are seriously interested in electronics, I strongly suggest you
    take a night course or part-time course before working on this power
    supply. Go to the library and get books on basic AC and DC
    electronics. Research on the internet. Never work alone, always with a
    friend. And always, always, work with your right hand and use an
    isolation transformer. The transformer isolates the ground from your
    body, which is a really good "path" for A/C if you are not careful. It
    only takes 10 milliamperes to kill you.
    -Isildur's Bane
     
  12. me

    me Guest

    1pam (ArctecJP) wrote in
    It is fixable, but not by you (or you wouldn't ask...) Throw it away, who
    wants a laser disk player when DVD players are so cheap...
     
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