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CRACKLES / STATIC WHEN TRYING TO ADJUST VOLUME LEVEL. INTERNAL KNOB CONNECTIONS BAD OR IS ENTIRE UNIT INSIDE BAD?

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This usually a result of contaminants (dirt / dust) in the volume control. You might be able to clear it by rotating the knob fully clockwise and then fully counter-clockwise (with no power - otherwise it will get very loud and distorted). Sometimes, the mechanical wiping of the control when twisted left and right in this manner will dislodge the noise-causing dirt.

If it does not work completely, or if the noise returns, you could try spraying an aerosol "electrical contact cleaner" on the control. Test spray on a q-tip and dab a small amount on the back of the enclosure to make sure the solvents do not attack the material (some plastics have adverse reactions to solvents). If the enclosure looks ok after a couple of minutes, gently pry the knob off the control (if a type that can be slipped off) and direct a spray along the shaft where it enters the enclosure (again, with the power off). Twist the shaft left and right while spraying. The combination of the spray and wiping action of the control should remove the noise causing dirt.

A spray lasting 5 seconds or so should be enough - but if after testing for noise and it is still present, try again.

Posted on Oct 07, 2009

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I have an AKAI AM-A70 receiver that generates static when turning up the volume. Most of it is ok about around level 2 -3 I get some static. Probably in the knob.


It is indeed dust in the variable resistor behind the knob. If you can take the cover off the unit and gain access to this potentiometer

http://static1.1.sqspcdn.com/static/f/998672/20174496/1346944143963/ISA405+volume+control.jpg?token=fQ7uQo11HTgjbl7ifw1xp16%2FTUo%3D

give it a light spray with WD40 or similar.

Another method which sometimes works is simply to twiddle the knob back and forth many many times at the noisy spot.
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Mackie 450, signal light off, Sound only comes out when amp. turned up above 75%, when usually used at 40-50%. too loud at 75% and UP, does not Work at ALL below 75%. only 2 years old, with 25 uses... i...


Doesn't sound like a fuse. They don't fix themselves when you reach 75%.

Try shaking the volume knob while in the 30-50% range and/or try (with the power off) rotating the volume knob numerous times from 0% to 100%. If when you plug it back in it responds ANY differently, you might have a bad volume potentiometer. If when you shake the knob you hear static or intermittent sound, you have a bad volume pot.

The only other thing I can think of is that the wiper of the volume pot is not in contact with the windings inside the pot until you reach the 75% mark. When the volume comes on at 75%, does it start off kind of "static" then come in loud and clear? Also try this.... adjust the volume pot to 74% (or when the sound just begins to come on). At this point shake the knob. If you hear static, replace the volume pot.

Unplugging it when still on shouldn't cause any damage... in fact it probably hasn't considering it works at 75% plus.

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Maybe try adjusting the MASTER level?

Good Luck

Other settings
Adjusting the master level You can adjust the level of the headphone and the stereo out by turning the MAIN VOLUME knob. The MAIN
VOLUME changes the analog signal level. This will also adjust the entire level of the MPC1000 digitally.
01. Press the [MODE] key and then the [PAD 10] (OTHER).
It switches to the OTHER mode.
02. Press the [F1] (GLOBAL) key.
The GLOBAL page will be displayed.
03. In the Master level field, set the level.
You will set the digital signal level, which will be sent out to the DA converter. The MPC1000 can output up to
32 sounds simultaneously. There is the great difference in the level when you play single sample and play 32
sounds. If you increase the value in the Mater level field, you can increase the entire level of the MPC1000 to
create more powerful sound with less noise. However, if you playback many sounds at the same time, the
level may be overloaded, which may cause distortion. If you decrease the value in the Master level field, you
can prevent distortion when you play many sounds at the same time. However, you cannot have a good
result in respect to the noise or punch of the sound. Set the appropriate value in the Master level field
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Radio Crackles on Medium Wave on Ford Focus C-Max late 2004


If your on/off button is also the volume control. Pull on the knob as you turn the volume up and down threw this section, don't pull so hard that you pull it off the radio. Do this a few tims it seem to work for me when I get static at the control knob. It either gets dirty in there or corrossion, or just a bad contact. Usually it's when the volume and on/off button are the same button.

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Why would my car stereo sound staticky when i give it volume'',it was not like that earlier


first adjust the fade and balance, checking each speaker for this issue. if they all continue to cause static when turning up the volume, then it is either the connections are crimped poorly, speaker connections are not secure at speaker or just a faulty volume control knob

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Marshall MG50 DFX, the volume knob OD channel crackles


Either the control is damaged (happens if they get hit) or it is possible the circuit board it is mounted on has broken solder OR worse, a crack near the control. The unit will require servicing. Parts are readily available.

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Radio volume will not adjust.


Hello. If this is repairable, the radio will have to be removed anyways. Some radios can be removed with a butter knife. If you pry off the front dash panel, there will be 4 screws holding on the radio. If you don't have the 4 screw type look for and tabs on the radio that are pryed up on the insides, pry them down with butter knife. Pull out stereo and disconnect the clip on wire harness.

You can try blowing out the unit and the knob if you purchase a can of "Air Duster" (compressed air and c02 in can)
If this radio is equipped, remove screws and cover to gain access to inside. Blow out the entire unit, especially the knob. The knob should also come off to spray inside.

If cleaning doesn't help, I suggest going to the junk yard and get another one for $15, otherwise WalMart, Kmart, sell them for $35+

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I sometimes lose sound from my left speaker and it crackles.


this is a speaker input pin problem, like pin is dameg or input pin is not atech proparly in computer problem is still present remove the cable and install new one cable in speaker

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By no means is this a solution, only a comment - Internal Amplifier is bad. Check your wiring before installing another unit.

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Sound cuts out above medium volume


This is usually a heat problem. The more volume you ask of an amplifier, the greater the current (electrical) draw, the more current draw the more heat is generated. This is true of ALL electrical/electronic items.

As you describe it, the fuse is not blowing (stays on) so my choice would be a chip heating up and then shutting down. If that's the case (99% probabilty). The only other reason would be if the unit has an overload switch inside, it would react this way. Either way it's still a heat problem and truthfully nothing you can do.

Try this first though:

Is the Denon dusty inside? Dust can create 2 problems-heat and static electricity. Look through any vents you can get at. If the area around the unit is dusty chances are it is dusty inside. The best way to get the dust out is using a can of compressed air unless of course your vacum cleaner has a "blow" port.

In my shop, when heat is supected I use a can of freon th cool down chips, etc to isolate the component. This is not for a "layman" and strongly suggest bringing it into a shop.

One more question. If the unit using a knob for volume-do you hear a scrating noise when you hit the no volume zone? What happens if you go past the point quickly? I ask because sometimes there can be a bad spot on the volume. The volume knob is basically a circular resistor, whether digital or analog so this is a vague possibility (the other 1%).

If you e-mail me the serial number I can check with the Denon engineering department to see if there are any design problems as it may be a covered repair. It never hurts to ask.

Sorry to be the bearer of bad news

Jeff

Jan 09, 2008 | Denon AVR-2803 Receiver

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