Question about Marshall Mg100dfx 100-Watt Combo Guitar Amplifier

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The best way to pach a cab with fret cloth - Marshall Mg100dfx 100-Watt Combo Guitar Amplifier

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Fred Yearian

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  • Marshall Master
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Fret cloth? Never heard of anything like that. The speakers will have GRILLE CLOTH covering the openings and the case has a material often refered to as "Tolex" covering it.

Grille cloth is NOT easily patched, you replace it all.

Posted on Oct 21, 2009

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2 Answers

Amp keeps blowing fuses


Blowing fuses, was caused by many thing.
Short of rectifier,resistor,elco,tube heater,tube pin, and also trafo itself (primary or secondary winding). It must check step by step.
CAUTION :
THIS IS HIGH VOLTAGE AREA.
RISK OF ELECTRIC SHOCK THAT CAN KILL.
DON'T DO THIS IF YOU ARE NOT TECHNICIAN OR NOT FAMILIAR WITH VACUM TUBE CIRCUIT. THE CIRCUIT MAY STILL CONTAINS ELECTRIC SHOCK EVEN IF IF THE AMP IS NOT POWER PLUGGED.


The simple steps (see picture) are:
  1. Disconnect all connection from secondary of power trafo (PLV,PDCH,PACH and PHV).
    Power ON the amp. If fuse is not blowing,trafo is good.
  2. Power OFF the amp. Unplug the cord.
    Connect PLV1-PLV2-PLV3 (this are Bias voltage,+/-15VDC and Backlight PCB voltage) to power trafo.Power ON the amp. If fuse is not blowing,PLV circuit is good.If fuse blowing,there are parts is damage (dioda,elco,7815/7915,resistor) in this PLV circuit.
  3. If step 2 is good,go to next step.
    Power OFF the amp. Unplug the cord.
    With PLV circuit stay connected,connect PDCH 1-2 and PACH 1-2 to power trafo. Power ON the amp.
    If fuse is not blowing,PDCH and PACH circuit is good and all tubes heater/filaments are lights after a few seconds.
    If fuse blowing,there are parts is damage (dioda,elco,tube heater pins) in this PDCH/PACH circuit.
  4. If step 3 is good,go to next step.
    Power OFF the amp. Unplug the cord.
    With PLV,PDCH,PACH circuit stay connected,connect PHV 1-2 to power trafo.
    Power ON the amp. CAUTION: HIGH VOLTAGE AREA is ON.
    If fuse is not blowing,PHV circuit is good.
    If fuse blowing,there are parts is damage (dioda,elco,tube pins) in this PHV circuit.
.amp-keeps-blowing-fuses-01sk4vtrndbaaguwe2brflsj-5-0.jpg
Notes:
  • Steps had to be done sequentially from 1 to 4, not upside down.
  • If tube/heater pin is short,it can't be repair. The tube must be replacing.
  • PDCH circuit is voltage for V1-2-3-4 heater/filaments.
  • PACH circuit is voltage for V5-6-7 heater/filaments.
  • Always replace fuse with same type.

amp-keeps-blowing-fuses-01sk4vtrndbaaguwe2brflsj-5-1.jpg

Oct 02, 2015 | Peavey 6505 Plus 120W Guitar Amp Head

1 Answer

BC Rich Warlock Frets catch high E string


It sounds lie the frets aren't seated correctly. This will need to go to a professional repairman. It's too easy to mess your guitar up if it's done wrong.

Jan 23, 2014 | B.C. Rich Music

1 Answer

MY EPIPHONE ACOUSTIC BUZZES ON 11TH FRET AND SOUNDS SAME NOTE ON 12TH FRET


This means the 12th fret is a bit too high. If you are not familiar with adjusting frets take it to any local guitar shop for repair.

Nov 13, 2013 | Epiphone DR-100 Dreadnought Natural...

1 Answer

I can't set my intonation on my 2012 fender american strat hss.i have done what they say to do but it doesn't help


okay first you must look at the frets if they are flattened out this is one reason and no matter what you do you will not be able to do it because the flattened frets are now making string contact further up in the scale length instead of in the center of the fret look at your string when you press it down it will be making contact on the very front of the fret making the notes sharp and driving you crazy with repeated attempts at setting the intonation you need a fret dressing if this is not the case and the frets are not worn but the strings are high off the fret board the neck relief needs to be adjusted to much neck curve upward results in higher string travel to be fretted which will add higher pressure to fret a note and making them sound sharp to check the neck take a capo clamp it at 1st fret now go to the fret where the neck joins the body and depress it count back to the halfway point and see how much space is between the top of the fret and the bottom of the string this should be around the eighth fret or seventh take a matchbook cover or a thin piece of plastic like a laminate you cover your pictures or documents with put it between the string and the fret the right height should be that it just fits between without moving the string once you've done this you should be able to intonate but please inspect all your frets first for flattening wear from playing if buzzing occurs after setting the frets in that are higher up the neck need to be dressed because they are not as worn as your regular playing zone which will make them a little taller when adjusting the truss rod do it 1/8 of a turn at a time do not crank it they are very sensitive to torque and the neck will bend backwards you must go slowly restringing and unbolting the neck unless your truss rod is at the headstock these are much easier but still require a little at a time 1/8 turns and patience good luck

Apr 21, 2013 | Fender Music

1 Answer

Some of my frets do not make any noise when i play them, could you please tell me why this is happening?


You should have NO fret noise if the neck is properly adjusted for string height. If you are getting fret buzz take it into a gutar shop for adjustment.

Google "fret buzz"

Jul 28, 2010 | Fender Squier Std Strat Mn Car

1 Answer

I ripped, just a little bit, the fret cloth on my Marshall JCM 900 cab. how do I fix it?


This may or may not help:http://speakers.lifetips.com/cat/61245/speaker-repair/index.html Also:http://www.simplyspeakers.com/11speakergrills.htm You may be able to sew it if you can obtain a curved needle. You can buy them where you buy sewing machines and supplies.

Oct 19, 2009 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

No notes on my guitars e string will bend


Hello
Have a look at the neck part where the strings move through that aligning unit which has the 6 slits cut into it where the strings goes through at the top of the guitar neck.

What usually happens, the slits get worked out, thus the strings move fractions closer to the fret board which will result in a muffled sound if you press down on the string you get a fret buzz. This happens when the string touches the fret board on more than one spot.

When you play a solo you can get a muffled sound out of certain strings. This happened to me, i just replaced this unit, very cheap, and all was fixed. Hope this can work.

Best regards

Oct 18, 2009 | Fender Deluxe Strat/Telecaster Hardshell...

2 Answers

Own Peavey Cirrus 5 BXP , Strings are to close to the frets.


If the problem you are having is buzzzing, yes. This height is called the "action" of the bass. You can change either or both the saddle and bridge. I would recommend that you have this examined at a music store to verify that the neck is straight and does not need adjustment too. This is part of normal upkeep for these. Expect an overhaul cost of about $50 if you have it adjusted.

Dan

Mar 19, 2009 | Peavey Music

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