Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Joe
 
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Default Logic3 Istation IP600 amplifier fault.... distortion/volume control

This unit is an Ipod accessory...a combined Dock and portable active
speakers. The problem is that the sound is extremely distorted,
through both the subwoofer and mid range speakers. Tried using
batteries,no improvement.
The distortion is made worse by operating the volume control, which
is not a pot but is the touch type, with 2 buttons mounted on the PCB,
up/down. The volume control itself does not seem to work, but also
adds a noticeable thump when the buttons are pressed.

There are also 2 decorative blue LEDs and these can be seen to dim at
random intervals. No obvious dry joints and I am waiting for a new
meter before testing properly.
I have noticed an Amazon reviewer report exactly the same fault, so is
there a recognised problem with these? Only difference is my set is
brand new(old stock, but unused).

Is it possible to pinpoint a likely component failure from these
symptoms? Capacitor?
Also noticed that the soldering/wiring is VERY untidy...some use is
made of apparently improvised solder bridges.
Appreciate any help, thanks,

Joe

AMAZON REVIEW:
1 of 2 people found the following review helpful:

Died after a few months of light use, June 13, 2006
See all my reviews

I received these speakers for Christmas and used them in the kitchen
when I cooked. I would say that at most they got 40-60 hours of use
over the past six months. Today I turned them off to answer the phone,
and when I turned them on the volume would no longer go up and the
sound is horribly distorted. Pressing the volume buttons only produces
more distortion. They are, in effect, dead.


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