Hi, this is my first Marshall amp. i noticed that every time i turn it on my volume wont kick in unless i turn the knob even though when i initially turned it on its already on 4. But probably this is a security measure where i wont blast the thing when turning it on. however i'm a bit bothered with the treble knob as it needs the same thing. i need to turn the knob in order for it to kick in even though its not initially at 0 when i turn it on. is this normal? or is it because every time i finished using it in my studio i turn the power of AND turn the plug from the main unit? does it affect anything by restarting the setting or whatsoever?
I haven't seen the schematic,
Are you old enough to remember when amps were all linear? Well, this is a computer. I haven't seen the schematic, but I'd guess the knobs are not connected to pots, but rotary encoders which send signals to a processor board to change settings. So, it's either a bug or a "feature" that causes these settings to start at zero when you boot the machine. You may be able to store all the last settings in memory so they start there.
SOURCE: popping noise
Your welcome. I'm glad I could help and if it came that way marshall should do it for you.
SOURCE: marshall vs232 makes a high pitched hum always
I saw this symptom last week on a similar amp. It was due to the reverb tank having come lose and being stuck magnetically to the back of the speaker causing wild feedback as you describe. Worth a look before getting out the soldering iron.
SOURCE: problem of marshall g80rcd, volume drop when i play
It sounds like your volume control is dirty. You will have to disassemble the amp enough to get access to the volume potentiometer which is soldered to the circuit board. There will be a square hole in it that you can spray some contact cleaner into the control. Use only contact cleaner as anything else could damage the control. Use a small squirt and rotate the shaft. If this doesn't solve the problem you may have to replace the control. While you have it apart, examine the solder side to make sure all the solder joints are perfect especially those on the controls. A bad solder joint can also cause the same problem. Before you take the amp apart unplug the power with the amp on and the volumes turned down. This will discharge the capacitors so it will be safe to work on. I hope this helps.
Testimonial: "thx alots, i did try to clean it by blasting air on it, but i just not really sure. i will give another try. thanks for your quickly response. "
SOURCE: Marshall VS65R is powered up it hums
Blown speaker NO (would not get sound at all)
Bad Reverb UNLIKELY (controls would deselect reverb and it would be out of circuit)
Bad preamp tube NO (controls have no effect)
Bad rectifier and/or filter caps LIKELY
Bad power amp POSSIBLE
SOURCE: The input jack on my Marshall MG100FX has fallen
I just had this problem and wasn't able to find the solution on line, so, here 'tis.
Take off the six screws on top of the amp cabinet. Unplug the speaker plug from the amp jack.The metal amplifer box can now be pushed out of the back of the cabinet and the input jack remounted. I had to force the box a bit as it was glued in just enough to tack it into place. (I was afraid to force the electronics box out so I took the entire cabinet apart piece by piece until I could see there was nothing left holding it in.) I found that prying it this way and that with a butter knife helped crack the glue.
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