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aiwa stereo problem

Discussion in 'Electronic Repair' started by [email protected], Mar 19, 2005.

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  1. Guest

    i couldn't turn on my stereo. it's a CA DW-600 model

    power cord seems fine, what could go wrong?
     
  2. Glynn R.

    Glynn R. Guest

    You've probably already thought of this, but:
    if there is no light or any visible indicator still on, UNPLUG the
    unit, wait a minute, plug back in.
    If that don't work, UNPLUG the unit, turn it around, and look for a
    "fuse". Little round door usually. Turn to unlock/open this, pull it
    out, see if fuse is still in one length or has been burnt in two.
    Replace with new fuse if burnt. Put old fuse back in if not.
    Also: check to make sure wall plug is putting electricity out. Use the
    lava lamp for this.
     
  3. Considering the way your question is formatted, you may not have the
    skills to repair this unit. Your question is too general.
    If you are familiar wih electrical safety, you need to open the stereo
    and begin to troubleshoot the power supply section. Then if there is
    something about your findings that you do not understand, ask a specific
    question here.
     
  4. Xiongnu

    Xiongnu Guest

    thanks for replying my post!

    i did as you says. but i couldn't find the fuse door. there's a
    little square plastic cover door in the back with a screw besides it.
    i unscrew it and couldn't take the cover off. it probably tightened to
    the body of the stereo.

    i tried to take the whole thing apart but i don't have all the screw
    drivers, there's some screws need extra long shafted screwdrivers to
    take it off.

    i had the problem occured after a thunderstorm, fuse burnt-out seems
    like a most-probable cause.

    this unit is also battery-powered. do you think it'll work if i
    install the battery? i'll try it anyway, man, 8 D-sized batteries,
    what a monster
     
  5. Glynn R.

    Glynn R. Guest

    Hi Xiongnu;
    Since you have given us additional information, I feel I should add to
    my reply, and also, like Jumpster Jiver, give you a warning.

    Looking for a fuse door or other things OUTSIDE the unit is always okay
    to do.

    Poking around inside with screwdrivers is NOT okay to do, until you
    understand how to avoid exposure to electricity.

    Units that are like yours, may not have fuses or other kinds of
    protection that are easy for a user to replace. They build the unit
    with the ability to withstand NORMAL problems, but should the unit have
    a big problem, the makers want you to take it to a professional, for
    proper repair, and also for your safety and so they cannot be accused
    of giving you a dangerous environment to poke around in.

    The unit may have a fuse inside, but you probably also see a warning on
    the back that says "No User-Serviceable Parts Inside", and possibly the
    words "Risk of Shock or Electrocution". That means that there will be
    parts in there that are exposed to your touch, and if you have the unit
    plugged in while you do that, you might get hurt.

    So, Xiongnu, you have told us that this happened after a thunderstorm.
    No unit can be designed to withstand all the possible outcomes of a
    nearby lightning strike.

    A fuse is designed to protect against a malfunction that would cause
    the circuitry to heat up and maybe cause a wiring fire. But a fuse is
    NOT designed to protect a device from the very fast snap-pop actions of
    a lightning bolt nearby. Even if the fuse inside is burnt and you
    replace it, there will be no guarantee that other components have not
    been messed up.

    I would recommend that, if you like this stereo and you want it to work
    again, take it to a repair shop.

    If you want to learn repair, maybe this unit is the one you want to
    experiment with, but do not open inside it or work on its insides with
    the unit still plugged in to the wall. And read about how you can
    protect yourself from shocks. There is a way to keep safe, but you
    cannot be "casual" around electricity.

    Okay?
     
  6. Guest

    Xiongnu,

    Do try installing the batteries and see if it works on all functions
    (radio, tape, CD). If you can borrow enough batteries from flashlights

    etc, this would be an excellent diagnostic test. If it works OK on
    batteries, the damage is limited to the power supply and should be
    repairable (maybe just fuse). If not, the lightning surge propagated
    further and caused additional damage, which could be
    difficult/expensive
    to repair.

    I've never seen a fuse door on these units. Every one I've seen, the
    AC line fuse is inside, near the cord socket or power transformer.

    The power supply on portable radios, stereos, etc. is connected
    directly
    to the AC line, and is on whenever the cord is plugged in. This way
    the
    power switch only needs to have a single set of contacts, to switch the

    DC power (from power supply or batteries) to the rest of the unit.
    This also makes these devices susceptible to lightning damage even
    when
    turned "off".

    Mike
    WB2ME
     
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