Question about Sharp CD-BA2600 CD Shelf System

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When switch on my sharp radio ;generate some noise like helicopter,

I changed many capacitors too but the problem is same.

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Pardon me for asking why do you have to changed the capacitors, cap usually have rating and values, unless you have good reason to changed these, ensure you are replacing the same ratings.

noise from radio usually occurs if there is interference of some sort, or insufficient or fluctuating voltages

if the sound seems high pitch, then it is from capacitors you have replaced

Posted on Oct 22, 2008

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No adio out


It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be your output drivers- the MOSFETS/IC's fitted for both the channels, Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise like a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.
You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board, maybe the protect circuit by itself is shutting off due to a faulty bias , maybe a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the protect is off then check for short on the speakers.

Jul 11, 2011 | Sharp CD-BA250 CD Shelf System

1 Answer

I have a Sharp XL-MP60. It powers up, shows a


Sometimes got fuses for the speakers check that but if they don´t got it the audio amplifier IC maybe are fried

Jun 11, 2009 | Sharp XL-MP60 Shelf System

2 Answers

Amplifiers has a hum


The hum therefore is a generated before it reaches the volume control. Check that all the connects are good, a bad earth will cause a hum. If the hum is in both channels it will be something that is common to both. Electrolytic Capacitors are there to take out hum, so suspect them first!

Jun 06, 2009 | JVC Audio Shelf Systems

1 Answer

Humming noise


If this is like my unit it is a high pitched squeal. I received my unit as a gift for Christmas 2007 and I thought it was defective. I contacted Homedics and they sent me a replacement but the problem persisted. As licensed amateur radio operator I am versed in electronics so I decided to track down the source of the noise. It turns out that the 16VDC power adapter is the source of the noise. It is what is called a "switching power supply" and is unfortunately not well filtered causing the high pitched squeal. I was able to get rid of the noise by modifying the power adapter and adding a 2200 microfarad capacitor in parallel with the output. This filters out the high frequency ripple and gets rid of the squeal. An alternative solution would be to search the Internet for a better 16VDC power adapter. It must supply 2 amps of power and have a 5.5mm OD/2.1mm ID center positive power connector.

Nov 09, 2008 | Homedics iSoundSpa Max Clock Radio with...

1 Answer

Sony Dream Machine clock radio


0) Read the last answer first :) it is the most likely.

1) Make sure that the noise is electronic, not mechanical,

a) Electronic noise comes from the speaker

b) Mechanical nose originates in the clock
(older mechanical clocks only)

c) Clocks come in 3 varieties:
Electronic
Mechanical "Flip Leaf"
Mechanical "Motor/ Gear" driven.

2) Assuming that your clock is electronic, there are
only two possibilities for causing static.

a) Extremely intense electromagnetic interference,
as in radio waves, from a thunderstorm or a powerful
transmitter nearby, such as a HAM radio or even
an active cell phone.

Intense electro-magnetic waves can be picked up by
internal wires within the radio which act as an antenna,
rectified (demodulated) by internal diodes and transistors,
filtered by internal capacitors and the speaker's inertia,
and still present enough audio frequency energy to the
sensitive speaker coil to be "quite" audible and irritating.

This can happen even with the power off, when the
interference is so strong that it needs no amplification !

This happens to my computer speakers, every time my
cell phone rings, and starts transmitting a return signal.


3) The power switch is intermittently shorting causing a small
amount of DC power to enter the radio, the more intermittent
the switch, the more noisy it gets.

This causes my old clock radio to turn on by itself when its
not supposed to.

The cause of the problem in either in the main power/ mode
switch, or in the clock driven switch or relay.

4) Old switches and volume controls get oxidized with time
and/or bridged by products of corrosion. The simple solution
is to clean them using a good aerosol contact cleaner,
available from an electronic shop for about 10 bucks.

Simply spray the cleaner into all the switches and controls,
while vigorously exercising each switch or control back and forth.

Make sure that you use a safe "electronic cleaner" designed
for the job. It must be safe on plastics, non-conductive, good
solvent and it must evaporate quickly. Don't breath the stuff !!!

Typically the spray will contain TF (tri-fluoro-ethane), or some
other freon substitute.

Freon (Di-fluoro-di-chloro methane) is bad for the ionosphere,
now illegal in most countries for that reason.

Also stay away from Carbon-Tetra-Chloride, which is
VERY toxic.

Do NOT improvise, or use acetone or alcohols, which may (will)
melt the plastic, causing the controls to permanently seize.

Get electronic contact cleaner from an electronics hobby shop.

Good luck. Martin
Please rate my answers.


Jul 04, 2008 | Audio Shelf Systems

1 Answer

Background "hum" in R speaker


Yea try plugging it into another wall socket, if it's still humming could be a damaged transformer. or bad capacitor.

Jun 05, 2008 | RCA RS2531 CD Shelf System

1 Answer

Sharp wf 940 portable cassette / radio player


inside radio there is relay near power supply. change it and then radio will work. or clean it.

Mar 01, 2008 | Sharp CD-BA2600 CD Shelf System

1 Answer

Sharp XL-MP130 CD shelf sys. won't work...at all


Hi There,

The clicking noise is usually the power supply "tripping" because of an over load, your explanation of the fault is very good and helps us in advising you about the fault...

Because the clicking gets slower it means that you have reduced the current being drawn from the power supply.

The item that is causing the over load is the item that when you plug it in or turn it on causes the clicking to start up...

Tyhe power supply is called a switched mode power supply and is usually a collection of transistiors capacitors resistors and a transformer all specially set up to make DC Direct Current and AC alternating current power for your electronics to work with.

These power supplies are expensive and no fuses are employed to make them work but a special detector circuit is installed to close down the power when a high current draw down is detected, Once the high draw down is detected the power supply closes itself down, so then it sees no more high current draw down so it starts up again and this causes the click as the internal transformer and capacitors once again start the cycle to operate to make the DC/AC supplies. So once started up the High current is detected and the power supply closes it self down and the cycle is repeated over and over....

Its a specialised job to locate the problem so its not something you can do your self without electronics training...

Cheers From YUBEUT

Nov 22, 2007 | Sharp XL-MP130 CD Shelf System

1 Answer

Fm reception going in and out also strange noises


Hooking up the AM antenna loop should not have fried anything, as I know lots of peeps who have done that. The FM RF amp. sounds like it may be at fault. The only way to tell if its bad is by hooking up an RF generator and I would be surprosed if you had one of those laying around. Disconnect the unit and take it to a repair shop.. If its an older model Time to get a new one. Good Luck

Jul 23, 2006 | Philips FWC155 CD Shelf System

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