Question about Marshall MG100HDFX 100-Watt Amplifier Head

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Hi I have a JCM100 the fuses are blown can you tell me what the problem could be thank you

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  • Marshall Master
  • 5,603 Answers

It probably is shorted filter capacitor(s) or shorted rectifier(s).

A shorted output tube could do this, but those are unlikely unless unit has been dropped.

Worst case is shorted power transformer.

In any case do NOT replace the fuses and keep trying as further damage could result. Take unit in for repair if you are not skilled in electronics... there are high voltages in this unit that are lethal.

Posted on Aug 07, 2010

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Posted on Jan 02, 2017

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My Yamaha electric piano, P80, will not power up


first - check the power supply if it's really giving power.
Get voltmeter or plug it to something else you know it's working.

If you are sure it does and still nothing, you need to check the fuse inside the P80. I've been there, it's not so hard to open it
(from below of course)

BTW, it's advisable to user surge protector on such delicate devices like computers and keyboards if there are any fuses that have blown. I can't tell you how many times a blown fuse has stopped equipment from working. I had a blown fuse go in a microwave oven a few years back. I called a repair guy while on a job to fix my Leslie (many years ago) and the culprit, a blown fuse. I could have fied it myself if I had given it more thought.

Check the internal fuses first and you might save some money and a trip to a repair center. , sometimes a fuse can look good even when it is blown. If you have a voltage tester do a continuity check on the fuse just to be certain.It's possible that the P80 does not use internal fuses especially since it uses an external 12 volt power pack There might be info on the fuse in the P80 manual. Otherwise try Yamaha support. A lot of low volage gear run of AC adaptors is unfused.

Another possibility is that the power connector or switch on the P80 is broken. DC power jacks are liable to get broken solder joints due to movement, especially if they are circuit board mounted and not chassis mounted. If you know what you are doing test the connector and switch with a multimeter.

If they are good then also check the wires from the switch to the main board. They a probably connected with a plug, which itself can come lose.

You can test for bad connections with the power off. Only test with the power on if you really do know what you are doing! You won't electrocute yourself but you can easily damage the keyboard if you are not careful.

Unless you are experienced in electronics repair that is as far as you should go.

Oct 23, 2017 | Yamaha Music

1 Answer

B115D


Hi, your amp has a short if the fuse is blown - it needs to be repaired - we can fix it - look on ebay. Thanks.

Mar 12, 2014 | Behringer Eurolive B115D Powered PA...

1 Answer

My Behringer PMX (or PMH?) 3000 powered mixer won't power on


Hi Robert,
The problem with ceramic fuses is that you can't tell if it's blown unless you put a meter on both ends to check for continuity. You probably have a friend that has a multi-meter sitting in a drawer somewhere, or a trip to the local Radio Shack will tell you right away - as well as likely finding the correct value fuse. Replacing it with a ceramic is not as critical as matching the AMPERAGE of the fuse (the Behringer site might be helpful: http://www.behringer.com/EN/Support/Find-Answers-or-Ask-Behringer.aspx
And no, the fuse didn't die on it's own, but are most prone to failure at turn on - so this time when you plugged it in after 3 years - it was time to go.

Mar 16, 2013 | Music

1 Answer

Fuse blown on Europower PMP 3000. Where can I find a 10 Amp 250 V ceramic replacement fuse?


You don't need to use a ceramic fuse if one's not available. You can also use a glass cartridge fuse as well. Just be sure the rating is the same. Be aware, though, that fuses seldom blow on their own. Usually it's because something else has shorted. So don't be surprised if replacing the fuse only results in another blown fuse. Behringer stuff is notoriously cheap and under-protected, so by the time the fuse blows it's usually more trouble than it's worth trying to fix. But maybe you'll be lucky and it will be something simple. Good luck, and thanks for using Fixya!

Jul 05, 2011 | Behringer Pmp3000 16 Channel Audio Mixer

1 Answer

I have blown the fuse in my yamaha hs80, when getting a replacement i realised it is hard to establish if it is a 0.2A or 2A fuse, as there is some sort of logo before the 2. I was wondering if you would...


Hi,it is hard to tell which one is correct without examining the blown fuse..
May I recommend to you to contact official YAMAHA support site as seen on the link below..
please fill all the blank info ont form and they will return to you in 24 hours..
Additionally I included another link for the user manual just in case..
Take care and if it succeeds please Remember to rate/vote and give me 4 Thumbs Up
for Helping out the Community :)

Hope this helps!

--------------

https://inquiry.yamaha.com/global/?act=1&lcl=en_WW&auth=none

About YAMAHA ProductsFor product support:
Please enter product category / model.Send your inquiry to us via the form provided.
Please fill out the following information. Entry fields marked with * are mandatory.

*Required Information
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http://www.helpowl.com/p/Yamaha/HS80M-hs-80m-speaker/19026
Yamaha HS80M Manual Pages

Jun 21, 2011 | Yamaha HS80M Powered Monitors

1 Answer

I accidentally changed Dip switches and light has power but no fan and no light ..have I blown a fuse ..thanks


Not likely blown fuse. Verify the correct dip switch settings... SOMETIMES the switches don't quite move completely so make sure they are completely one way or the other.

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1 Answer

My Rocker 30 has been working just fine up until now. I go to turn on the amp and I get no sound whatsoever. The tubes and ht fuse are fine. I've looked at some forums online and they say the fuse might be...


Apparently you have tested the tubes on a tester and usually there is a pilot light that would not be lit if fuse was blown.

Common problems are bad jacks and switch contacts on power amp INPUT or INSERT jacks. Also circuit board cracks and bad solder joints are fairly common, especially where volume controls attach to the circuit boards.

More expensive things are things like fried speaker if volume was played too loud. An ohmmeter test of the speaker would tell if the voice coil has blown.

Jul 16, 2010 | Orange Rockerverb Rk30tc 30watt Electric...

1 Answer

Blown fuse, replaced it, other blown componets


http://music-electronics-forum.com/t9396/ THe link you need is in the thread. Just remember you will need test equipment, soldering skills, troubleshooting skills and direct replacement parts in the case of "chips".

Sep 01, 2009 | Marshall MG100HDFX 100-Watt Amplifier Head

2 Answers

The amp just turned off and won't come back on. fuse blown?


If you can see where the power wiring comes into the amp there has to be a fuse in there somewhere as the fuse is designed to cutoff all power when overloaded

Mar 24, 2009 | Line 6 Spider Iii 15 Modeling Guitar...

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My son's guitar amp Epiphone guitar amplifier model ep-800, does not work after someone plugged a bass guitar on high settings. He tried it the next day, only to find out it didn't work. Could the bass...


it could have blown the speaker, a regular guitar amp is not meant to handle a bass, you should be able to look into the back of the amp and see if any of the speaker is damaged, or there may be a blown fuse inside the amp, if you check for this please MAKE SURE TO UNPLUG THE AMP FROM THE POWER SOURCE FIRST, and if needed replace the fuse with the exact same type

Mar 21, 2009 | Music

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