Question about Marshall Amplification Marshall MG250DFX 100W Guitar Combo Amplifier

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Is there a circuit breaker - Marshall Amplification Marshall MG250DFX 100W Guitar Combo Amplifier

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There should be a fuse holder near the place in the back of the amp where the power cord plugs in. Also some Marshalls have fuses in fuse holders on the circuit board. Always replace with the same value and type as the original fuse. Never open up the amp when it is plugged in to the outlet. When replacing the internal fuses do not touch the capacitors as they retain a lethal charge. If the fuse continually blows it is an indication of a more serious problem which will require servicing by a qualified repair person.

Posted on Jun 25, 2009

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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

My amp will not power up?


Measure the breaker, measure the power switch, measure the power cable,

Feb 12, 2014 | Peavey IPR-3000 Power Amp

1 Answer

Some of my microphone inputs stopped working


downloads.mackie.com load this bus driver file. use winzip to install.....have fun meder's tv service

Aug 28, 2012 | Mackie 2404-VLZ3 Mixer

3 Answers

Circuit diagram of zoom g1x


G1X circuit diagram is the same as the G1. They differ only on the pedal circuits.
circuit-diagram-zoom-g1x-shyexoo0xcste5eq310zs3ot-4-0.jpgcircuit-diagram-zoom-g1x-shyexoo0xcste5eq310zs3ot-4-1.jpg
Give your email,and I'll send the circuit diagram.

Jun 24, 2012 | Zoom G1x Guitar Multi Effects Pedal with...

1 Answer

My adam A3X is suddently having the power switch stuck. I can no longer turn it on.


As loon as the power switch is not also a circuit breaker, just change the switch. If it is also a circuit breaker then there probably is some problem with the amp.

May 27, 2011 | Adam Audio A3X 2Way Studio Monitor...

1 Answer

Hi, I own the Dynaudio BM6A acoustics monitors & I want to know if there is a circuit breaker system inside the monitors, for surge protection? The reason I ask is because I have no power conditioner...


If an internal circuit breaker pops, something has failed. Even surge protectors do little to protect stuff unless they are high level types with filtering. Key thing: ALL your interconnected equipment MUST be powered from the SAME receptacle or power conditioner. Using multiple outlets can allow building "ground bounce" to rupture sensitive input circuits. Use of balanced lines avoids noise in systems.

Apr 21, 2011 | Dynaudio Acoustics BM6A MK II Active...

1 Answer

My line 6 doesnt turn on,its like no electricity is going through it? i would like to know what is the problem???


I can't find a schematic but there should be a circuit breaker or a fuse on the backside of the amp.

Nov 13, 2010 | Line 6 Spider Iii 15 Modeling Guitar...

1 Answer

How do I remove the keys from a Roland KR 4700 piano? We can't figure it out. Please help! I can't afford to get a repairman. I need to replace the contact strip. It's happened before.


If these are semi weighted keys here is a cut and paste from a manual:
19. Disassembling the Keyboard Assembly
* After inserting a round stick (Rod: TX000670)
between the frame and the keys, remove the
circuit boards. (Fig. 23)
19-1 GHD EBUS L, MK SUB Circuit Board
(Time required: about 12 minutes)
Remove the seven (7) screws marked [260A]. The
GHD EBUS L and MK SUB circuit boards can then
be removed. (Fig. 24, Photo 5)
19-2 GHD M Circuit Board
(Time required: about 12 minutes)
Remove the five (5) screws marked [260B] and the
screw marked [262]. The GHD M circuit board can
then be removed. (Fig. 24)
19-3 GHD H Circuit Board
(Time required: about 12 minutes)
Remove the four (4) screws marked [260C] and the
screw marked [262]. The GHD H circuit board can
then be removed. (Fig. 24)
* Keys can be removed without removing the
circuit boards.
* After removing the GHD EBUS L, GHD M and
GHD H circuit boards, and the rubber contacts
can then be removed.
19-4 Rubber contact
Remove the GHD circuit board for the involved key.
The rubber contacts can then be removed.

The rod is inserted above the weighted hammer and the bottom of the keys from one end. It appears to be about 1/4 inch diameter dowel and will run the full length of the keyboard. You might use 3 foot ones from each end.

Screws are removed and the boards removed without taking the individual keys out.

Mar 17, 2010 | Yamaha NP 30 76 Key Lightweight Digital...

1 Answer

Crate amp blew a house fuse and stopped working. pilot light still works and I can get a distorted signal through the headphones if I play a guitar very loudly through it.


When a piece of equipment causes a fuse to blow or a breaker to trip, it normally means something in the equipment's circuit was shorted. Either because of heat, moisture, a loose screw, loose wire, loose part, a bug, etc. For safety reasons, don't plug it back in and take it to a repair shop.

Hope this helps!

Jun 04, 2009 | Crate Music

1 Answer

Amp will not come on


hi thanks for using fixya!!

On this error, you should check still the built in breaker.

Apr 21, 2009 | Peavey Pv 2600 Power Amplifier

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