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When turning the volume knob i get static & loud feedback. does it need to be cleaned? Yamaha Model # CR-640

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Its old, yes. good luck

Posted on Feb 11, 2010

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Posted on Jan 02, 2017

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Hi Aawpharmd,

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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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1 Answer

Yamaha cr-640


I look for a shop that is clean, professional, and leaves a good impression it will be taken care of, you should be able find a suitable one in Melbourne.

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This is likely in the power amp or the drivers for it.

The key to troubleshooting is a schematic. Try to procure one.

You MIGHT try using circuit cooler in the area of the power amps to isolate a bad component or cracked circuit board.

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FENDER CYBER TWIN AMP SOUNDS GREAT WORKS GREAT BUT WHEN YOU CRANK THE VOLUME A LITTLE LOUDER THAN NORMAL THE AMP GET STATIC OR DISTORTS OR POPS AND CRACKS. COULD THE TUBES DO THIS?


First make sure you have the TRIM knob positioned correctly. When playing loud the Red Led should just blink a bit so you know you're not overloading the preamp and Digital sections. The Twin Reverb Patch is a clean place to start so select that first. On this amp it's a good idea to set the MASTER to 5 and use the VOLUME control at as low a setting as you can. The GAIN control should be set under 4. You better sound crystal clear on this setting. Try turning up the volume to see how loud you can get without breaking up. It's a guitar amp so there will be some grainy distortion but it should be very light. I bet you get through this test without much trouble. After that you need to be very careful about what settings you're using since many of the presets may not mesh with your guitar pickups. You should concentrate on tweaking one highgain setting and learn about how the controls interact. The amp is so much more complicated than a 10 knob standard guitar amp. Most people need to put in some time to get a handle on it.

As far as the tubes go, typically they can get microphonic which was a problem with versions 1.1 and 1.0 of this amp so check that. Fender had a Cyber twin upgrade kit way back to fix this but if you have version 1.2 or 1.3 that's not it. Problems with this amp are typically caused by control setting more often than an electronic problem but this reponse should get you started figuring it out.
MYREL

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YAMAHA YSP-1 SOUND PROJECTOR- LOUD STATIC NOISE FOR 30-60 SECONDS


had the same problem. Called Yamaha tech, They said try unplugging it it from the wall for at least an hour. That worked. Then it came back. My son the geek unplugged the cable where it goes into the unit and plugged it back in. Problem went away! So.... methinks it's as simple as keeping the contacts going into the wall outlet AND the plug going into the unit CLEAN. Here's a link on some good ideas on how to do that: http://www.naxja.org/forum/showthread.php?t=15476

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1 Answer

Volume varies by itself on the Yamaha htr5840 Receiver


The pod that controls the volume knob is either very dirty or needs replaced! (If you remove knob you will see the shaft of the volume pod go into the pod itself) You may try cleaning with a can of high pressure air by spraying short bursts of air in and around the pod area! If that doesent work you will have to replace the volume pod!...Please rate my response! Thank You!

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Static while adjusting volume on Cambridge SoundWorks model twelve


If the volume is controlled with a mechanical volume control, usually a knob you turn or a slider you move, the problem is the volume control device (potentiameter) needs to be cleaned. That requires special cleaning chemicals most people do not have in their home. You would need to take it in to be serviced. This is a very inexpensive repair. Normally only costing about $50 to $75.

If it has electronic controlled volume like a button you press then it will still need to be serviced, but this is an unlikely case with static in volume when using the volume control.

If I can be more help let me know.

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Jul 06, 2008 | Audio Players & Recorders

1 Answer

Popping & hardly any volume


i had the first problem and you can probably fix it by turning the volume knob all the way up and down about 20 times. it worked for me. supposedly the potentiometers in the z-5300 get dirty or worn out, somehow this might fix it. for the second problem maybe try plugging it into the laptop and unplugging it again seeing if it goes back to normal?maybe its a problem with the amp?

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