Question about Fishman Loudbox 100 Acoustic Guitar Amplifier

1 Answer

The fuse blows right away. How do I isolate this problem?

Posted by on


1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert who has answered 20 questions.


    An expert that hasĀ over 10 points.


    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 41 Answers

Unplug all cables, turn all gains and volume to zero and switch on. If the fuse still blows I'm afraid it has a power supply fault and will need repairing by a tech.

Also, make sure it is a T-type or slow blow fuse of the correct rating. Ensure that if a mains voltage selector exists that it is set for your local mains voltage.

Posted on May 28, 2011


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I had Mackie th15a 110vac and it had busted fuse, when i replace it when a new one it got busted again...i plug the power cable to 110vac without a regulator. what would be the possible problem in the...

If fuses keep blowing there clearly is something wrong with the power amplifier. You can start by getting access to it and doing a visual inspection for signs of overheating or short circuits but then it will be necesary to check parts and eventually you will be able to isolate the defective part(s) and repair it.

Dec 26, 2013 | Mackie HD1801 Powered Subwoofer (1600...

1 Answer

Trying to find the right fuse for a eden World Tour 800 bass amp

Well, hope this helps you.

Fuse Requirements:
USA @ 120 Volts /60 HZ - 10 Amps, 5 x 20 mm GMC/T/slow blow
Europe @ 240 Volts/50 Hz - 5 Amps, 5 x 20 mm GMC/T/slow blow
Japan @ 100 Volts/60 Hz - 12 Amps, 5 x 20 mm GMC/T/slow blow

Mar 10, 2013 | Hartke HyDrive HX410 4x10 Bass Cabinet...

1 Answer

Blowing fuse on ada 8000

you need to look at this ,Very usefull

Dec 28, 2012 | Behringer Ada8000 Ultragain Pro 8 Ch...

1 Answer

Do i have the right fuse

This speaker at full power draws average 1.3A at 230V and 2.5A at 120V. Mackie's recommended fuses are in line with this so your fuse is actually too high a rating. It is possible you are using cheap fast blow fuses or are over-driving the speaker (which should cause the fuse to blow) These speakers are only capable of 118db sustained (@1M) so cannot be expected to cope with anything but small venues or gentle music.

Dec 07, 2012 | Mackie Srm 350

1 Answer

Hi, I have a mackie srm1801 and in the middle of a gig the OL LED came on and wouldn't go off. Input was unplugged and still the light wouldn't go off. After a while the fuse went and now there is no

It is likely that the O/P transistors have blown, especially if the fuse keeps blowing and the O/L led comes on. It's a repair shop jobbie

Nov 30, 2011 | Mackie SRM 1801

2 Answers

When i turn it on i get a hum that gets louder then the fuse blows. if i turn on stand by before the fuse blows the hum goes away

Most likely one of the diodes CR6 through CR9 is shorted... Test them with an ohmmeter with the standby switch OFF and no power plugged in either. Slight chance one of the power tubes is shorted but that is rare. A shorted tube socket is another possibility but it too is rare. If one of the diodes is shorted, replace them all as the others are likely degraded. Put a 150 watt lamp in series with the power cord to test to avoid blowing fuses. If the lamp lights and stays on, there i still a short. the filter capacitors may also be degraded if a diode has shorted.

Aug 29, 2011 | Fender Hot Rod Deluxe Guitar Combo...

1 Answer

Hello, i bought a ledrain 36 about 3 yrs ago the fuse just keeps blowing every time i replace it could you please give me some idea what the problem could be because non of the pcb looks burnt...

The power supply has likely failed. Schematics are hard to find and working on these takes some skill. The supply is a switching type and usually the main switching transistor and sometimes the driver and the regulator chip fail. There OFTEN is NO visiblke evidence of the failure. To avoid blowing fuses use a 40 watt lamp in series with the power cord. For personal safety use an isolation transformner when troubleshooting.

Aug 03, 2011 | Chauvet LEDrain 36 CHVLEDR36

1 Answer

StageSetter 8: when the power switch is turned on the internal fuse blows immediately.

Likely the filter caps or the rectifier diodes have shorted. Power supplies are easy to work on unless the are switching type.

To work on this, replace the fuse and put a 25 watt light bulb in series with the hot side of the inout power... saves fuses and will send enough current in to troubleshoot with a meter. Use SAFE procedures when working on electrical equipment. For switching power supplies you need to use a line isolation transformer for personal safety.

Mar 14, 2011 | Elation Stage Setter 8 Dmx Controller

1 Answer

Have marshall mg100 hdfx head -power it up and blows fuses right away!

This is either a shorted component in the power supply section or in the power amp electronics itself. Continuing to replace a fuse MAY damage additional components. Take unit in for servicing.

Nov 29, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

2 Answers

Hello...I am an owner of the Fender Passport PD-500 Sound System

Replace the fuse only once. If it blows right away, then servicing is required as continued replacement will likely damage more inside.

Most of thes have a fuse holder that is a part of the input power socket. There is a little rectangular panel adjacent where the cord connects with a tab that you gently pry out and carries a small fuse. Replace the fuse and re-install the carrier.

These units are very hard to work on due to packaging.

May 30, 2010 | Fender Passport Deluxe 500watt Sound...

Not finding what you are looking for?
Fishman Loudbox 100 Acoustic Guitar Amplifier Logo

Related Topics:

391 people viewed this question

Ask a Question

Usually answered in minutes!

Top Fishman Music Experts

Michial Gueffroy

Level 3 Expert

1138 Answers

Don Hart

Level 2 Expert

108 Answers


Level 3 Expert

3130 Answers

Are you a Fishman Music Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides