Question about Music
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Posted on Jan 02, 2017
SOURCE: Static Noise from guitar amp.
I take it you have made sure that both the cable to the distortion box from the guitar and the cable to the amp are both good. From the description you give, it sounds like there is no signal getting to the pedal. If the cable is good, then the next likely suspect would be the input jack on the fuzz box. Try wiggling it a little with the guitar cable in place to see if it is loose. Some input jacks are unbelievably cheap and flimsy. A crackling sound (static like) is almost always a bad connection. If it was the output jack, I would think that the guitar signal would come through a least a little bit, but you might want to try wiggling that one, too, if the input jack isn't the culprit.
Another possibility to check is the battery, but this doesn't seem as likely. Some effects units devour batteries, especially units that use 9V batteries. I have a multi effect pedal that kills a 9V in about an hour.
Posted on Jan 24, 2009
i got d same problm. i fixed it myself.. check all the op amp ic's if they're all gud. if youre not sure, replace all 4 rc4558 ic's. in my case, i still felt a very small output signal from my pedal (equalizers, vol n gain ctrls r gud since they vary when i change the setting) so i suspected that one or 2 of my ic's were damaged. i only replace d last two op amps which my signal passes thru. i also had this problm with my marshall drive master. same diagnosis and solution. check your schematics
Posted on Feb 13, 2009
The things to check arre FIRST the cable. These often have breaks or bad connectors. Replace with known good one and try it.
Next are the jacks on the guitar and the amp. These go bad and wiggling the KNOWN good cable at each end will flag which or both being bad.
Next are the switches and potentiometers in the guitar. Use some CRC226 sprayed into the pot and switch contacts... use sparingly...
The key is to find which thing or things are bad.
Posted on Sep 15, 2009
It sounds like a job for a technician. There are high voltages in the chasis and the potential for a serious shock to the unwary.
That said, I can suggest several possibilities.
First, make sure the controls aren't causing the problem. Contacts can build up dirt and oxides and block the signal. Try twiddling the controls and see if the problem comes and goes, or if you hear scratchy noises. If symptoms are found, buy a contact cleaner spray, take out the chasis after unplugging and letting it set for an hour, being very careful not to touch any exposed conductors inside. You'll see some holes in the control bodies; squirt cleaner for 2-5 seconds and work the controls.
Also see if the problem happens without the footswitch, and try the channel switches several times - same problem, dirt and oxidation.
Other possibilities - cathode bypass capacitors drying up, and it looks like the amp uses some opto-couplers at various stages.
Posted on Nov 09, 2009
This sounds like a broken ground wire or trace within the unit if an IDENTICAL pedal does not act the same AT THE SAME SETTINGS.
Sometimes a circuit trace gets broken on the board inside pedals and can cause this.
Since an identical pedal doesn't have the problem, service is required.
If you know electronics you can open the pedal and look for obvious problems.
HINT: Use a bright LED penlight to "candle" the circuit board to look for cracks.
Look for broken solder joints... this can take an experienced eye to spot.
A distortion pedal NORMALLY is very simple circuitry.
Posted on Nov 10, 2009
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