No sound from my JCM900

simplyben · 09-16-2009, 04:25 PM

What could be wrong with it?
I've not done anything with it since it last worked and all of a sudden I'm getting no sound out of it, it starts to hum when I switch it on but nothing else. Checked all my cables and such so no problem there.

superimposedmedia · 09-16-2009, 06:32 PM

Jiggle the wires. It's an old networking trick but it should work the same.

Jesstaa · 09-16-2009, 09:18 PM

Quote:

Originally Posted by superimposedmedia

Jiggle the wires. It's an old networking trick but it should work the same.

Umm...

How long has it been since you replaced the tubes/is everything plugged in properly?

RobS · 09-17-2009, 02:17 AM

Are the tubes lighting up? Both preamp + OP?
Is there a valve failure light on?
Are the fuses ok?

Obvious one..........has the speaker lead become dislodged?

Also there is an onboard fuse on the PCB, it could have blown but if not confident get a tech to check that one.

Lastly, get some contact cleaner and give the effects loop jacks a good clean. These can do all sorts of wierd thing if dirty/corroded.

ironlung40 · 09-19-2009, 12:22 AM

I'm waiting for Ken to drop in here and say to sell the 900 because it is crap and buy a DSL

I don't know what to tell you about the no sound issue. I've had this problem before, but it was my pedalboard acting up. I plugged straight in, and no problem, so I then troubleshot the pedalboard, found that a grounded wire had cut the power.

Anyway, good luck on this one.

superimposedmedia · 09-19-2009, 01:48 AM

Quote:

Originally Posted by Jesstaa

Umm...

It's true. Actually, I learned that "Jiggle the Wires" trick during my CCNA course. It's amazing that something so simple would be so useful. Sometimes, cables lose a strong connection and also it can help you find a cable that is not even plugged in. simplyben stated that he checked the cables but there may be an issue of a corroded solder that lost connection. I have a cable right now with that very problem. It could be the guitar output. There's just not enough information. Considering the fact that simplyben hasn't responded, he may very well have realized he forgot to take it out of standby ???

theflyingmat · 09-19-2009, 07:03 AM

[QUOTE=ironlung40;60950]I'm waiting for Ken to drop in here and say to sell the 900 because it is crap and buy a DSL

QUOTE]

I'm quite liking my new 900. I also like my DSL but is it better.??......I would say it's simply different

synco · 10-19-2009, 03:46 PM

hi there!

Seems like I got the same problem today. I was playing and then the sound faded out to nothing and no sound since, just hum. No smell, I used the amp on about 40% volume so I hope it doesn`t burn off.

Don`t know what to start with. What it could be?
thanks

09-16-2009, 04:25 PM	#1 (permalink)
simplyben Junior Member Join Date: Sep 2009 Location: Halifax, England Posts: 3	No sound from my JCM900 What could be wrong with it? I've not done anything with it since it last worked and all of a sudden I'm getting no sound out of it, it starts to hum when I switch it on but nothing else. Checked all my cables and such so no problem there. __________________ Epiphone Les Paul Standard Trans Blue Epiphone G400 Dunlop Crybaby Visual Sounds Double Trouble Madebymike Salt Muff EHX Octave Multiplexer Dano Fish n' Chips Boss GE-7 Marshall JCM 900

09-16-2009, 06:32 PM	#2 (permalink)
superimposedmedia Senior Member Join Date: Sep 2009 Location: Louisiana Posts: 119	Re: No sound from my JCM900 Jiggle the wires. It's an old networking trick but it should work the same. __________________ Listen to Bee Sting - myspace.com/superimposedmedia

09-17-2009, 02:17 AM	#4 (permalink)
RobS Senior Member Join Date: Apr 2009 Location: Melbourne - Australia Posts: 144	Re: No sound from my JCM900 Are the tubes lighting up? Both preamp + OP? Is there a valve failure light on? Are the fuses ok? Obvious one..........has the speaker lead become dislodged? Also there is an onboard fuse on the PCB, it could have blown but if not confident get a tech to check that one. Lastly, get some contact cleaner and give the effects loop jacks a good clean. These can do all sorts of wierd thing if dirty/corroded. __________________ JCM900 4100 DR + 1960 A + B + Powerbrake Ibanez PS10CL Paul Stanley Custom Gibson LP Traditional Epiphone LP Custom No pedals.........

09-19-2009, 12:22 AM	#5 (permalink)
ironlung40 Senior Member Join Date: Nov 2008 Location: Maryville, TN Posts: 309	Re: No sound from my JCM900 I'm waiting for Ken to drop in here and say to sell the 900 because it is crap and buy a DSL I don't know what to tell you about the no sound issue. I've had this problem before, but it was my pedalboard acting up. I plugged straight in, and no problem, so I then troubleshot the pedalboard, found that a grounded wire had cut the power. Anyway, good luck on this one.

09-19-2009, 07:03 AM	#7 (permalink)
theflyingmat Senior Member Join Date: Feb 2009 Location: Peternapper Scotland Posts: 111	Re: No sound from my JCM900 [QUOTE=ironlung40;60950]I'm waiting for Ken to drop in here and say to sell the 900 because it is crap and buy a DSL QUOTE] I'm quite liking my new 900. I also like my DSL but is it better.??......I would say it's simply different __________________ DSL 50watt Head JMP MII 50watt Head JCM900 SL-X 50watt Head JCM900 4x12 Angled Cab 70's 4x12 Base & Angled Cabs 70's 2x12 Checkerboard Cab Artiste 2x12 combo 30th 6101 & Ext cab JCM 800 4221 combo Guitars: Gibson LP G/Top 56RI, Gibson LP Custom 80, Gibson LP L/Burst 02, Gibson SG Jnr 63, Gibson M/Maker P90, Fender Bullet USA 78, Fender Tele 62RI MIJ, Robin Artisan, Moon Rhubard&Custard

10-19-2009, 03:46 PM	#8 (permalink)
synco Junior Member Join Date: Oct 2009 Posts: 1	Re: No sound from my JCM900 hi there! Seems like I got the same problem today. I was playing and then the sound faded out to nothing and no sound since, just hum. No smell, I used the amp on about 40% volume so I hope it doesn`t burn off. Don`t know what to start with. What it could be? thanks

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