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Pete's Big Fuse location and other fix thread
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okstrat
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Joined: 25 Jun 2006
Posts: 1536

PostPosted: Wed Jan 28, 2009 6:27 pm    Post subject: Pete's Big Fuse location and other fix thread Reply with quote

I see this a lot... and I had one of my RM100s on the bench, thought I'd take a few pics of the guts and show you guys a few places to check if you're having issues. A few things before we start though:

I and Ned and ANYONE involved with this board take no responsibility if you go digging around in your amp and hurt yourself. If you don't think you should be troubleshooting your amp, then go take it to a tech. Don't try to save a few bucks and hurt yourself in the process. There can be lethal voltages in a guitar amp and I can't cover every possiblity or eventuality in this thread - YOU USE ANY INFORMATION IN THIS THREAD AT YOUR OWN RISK.

Unplug the amp from the power supply.

First off, is the amp totally dead? Then take a small flat blade screwdriver and remove the fuse cover next to the power cord. BE SURE YOU DO NOT CHANGE THE POSITION OF THE FUSE COVER - Your voltage should be top center. Don't change this! Mine was 120v, for example.



Pop the cover off, pull out the fuse, and check it with a multimeter. I use one that can be set to make a noise when there is continuity - place a probe on each end of the fuse and see if your meter reacts the same as if you were touching the probes together. If so, then the fuse is passing current and you're ok. Fuses can be obviously burnt and bad, but sometimes they look good but are bad. Testing with a meter is the best way.



Now take the amp chassis out of the enclosure. If you need help figuring this out, it may not be a good idea for you to go any further.

Discharge the capacitors at this point. If you don't know how to do this, look it up. Google is your buddy. If you don't want to take the time to do this, take the amp to a tech.

All the fuses other than the main fuse we looked at and the individual tube fuses are all in a cluster near the midi jacks. You will have to remove the midi board to get to two fuses underneath it. Take the two screws out, and there is enough wire to move the board over and away.



Note the dip switches on the midi board for setting channels...



Here's a pic with the midi board moved, of all 7 of the fuses. 4 and 5 were hidden under the midi board. Remove and test each one, if one is bad - replace it with the same value and type. NEVER put a fuse larger than specified in any device. Bruce Egnater has stated we can use 400ma fuses for the tube fuses, but I would leave all the other ones alone value-wise.



While you're in there, look at any spade connectors. If you've had a speaker cab open, usually they use connectors like this for the speakers. Be sure all of them you can see are tight and pushed on the terminals correctly. This pic is of the standby and power switches - mine came loose on a standby switch and the amp wouldn't come out of standby. It just had a loose connector.



More to come later, I'm beat. Smile

Pete
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Mailman1971
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PostPosted: Wed Jan 28, 2009 6:44 pm    Post subject: Reply with quote

Pete once again.....your info is GOLDEN!! You been a big help when my RM100 was "dead"....it was those darn eternal fuses!!
Not really that hard to get at them but I was nervous to be poken around inside. Your info helped alot. Razz

Dan
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JKD
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PostPosted: Tue Feb 03, 2009 3:03 pm    Post subject: Reply with quote

Pete..here's a thought, why not post the Fuse types, sizes and rating.

The only one I know is the external tube fuses:

Glass 5x20mm Fast Blo 250V/400mA (stock was 250 or 315...they now ship with 400)

and main external fuse

50W
Glass 5x20mm Slo Blo 250V/3A (at 100/120V), 1.5A (at 220/240V)

100W
Glass 5x20mm(?) Slo Blo 250V/5A (at 100/120V), 2.5A( at 220/240V)
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Last edited by JKD on Tue Feb 17, 2009 9:07 pm; edited 2 times in total
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okstrat
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PostPosted: Thu Feb 05, 2009 12:50 am    Post subject: Reply with quote

That's a great idea, I'll have to get that up here. Smile
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shred-o-holic
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PostPosted: Tue Feb 24, 2009 9:32 am    Post subject: Reply with quote

What about the RM 50? Is everything the same? I have an RM 50 coming this week so I have loads of interest in this info. Cool
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paintkilz
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PostPosted: Sun Mar 15, 2009 1:25 am    Post subject: Reply with quote

what are the values for the fuses on the midi board? fuse 7 went out on me and im not getting any bites to the thread i made asking..
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Mailman1971
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PostPosted: Thu Apr 23, 2009 4:55 am    Post subject: Reply with quote

Same question:

mine just said "250V"
but how many amps? 1 amp....2 amp...
What would be a safe bet on these eternal fuses?
My RM100 took a dive on me again. I get power....fan comes on.....but no lighting of the tubes. One of the fuses was burned out (The fuse you marked #1) I tried to replace it with other fuses that were 250V and no luck.
I checked all the other fuses and they pass the multi meter test. Not sure what the deal is or could be. I will have to tinker around with it later today. I was just getting frustrated last night and decided to stop until the next day and come in with new eyes. Any suggestions guys?
This happened before to me but I just pulled the fuses and re-set them and it fired right up. Stumping me this time.

Dan Confused
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Mailman1971
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PostPosted: Wed Apr 29, 2009 12:24 pm    Post subject: Reply with quote

Ok....just brang my amp back from the DEAD! Confused
One of the eternal fuses. With some guidance from Pete found a seller on the web(mouser) and thank god! I could not find these things locally to save my life. I totally understand about not wanting to give out the wrong values for the fuses since you can REALLY break something inside that amp if the wrong is used. Lucky to have this board and lots of cool people helping me to get the parts I needed. Shame a 95 cent fuse can shut down the whole amp! But the one I had to replace was the one that send the signal or heat to light up the power tubes. I had power to my amp but the tubes werent firing up. the fuse I replaced was 10 amps 250 volts in that little fuse! Shocked
But once the parts came in today....popped it in. Did a test power up....tubes started to glow(YES!!) so I slapped it back together, did a Bias and a quick run on the amp. Sounds and playing perfect.
Just wanted to share my woes and griefs with you all. I am getting pretty good at taking the amp apart but I would rather leave it up to the experts. Like Pete mentioned, if your amp "dies" chances are its one of the 7 eternal fuses.
Rock on!! Cool
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JKD
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PostPosted: Wed Apr 29, 2009 1:04 pm    Post subject: Reply with quote

Man I wish those fuses were eternal Smile Am guessing you meant internal ??? Confused

'grats on being up and running again.
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Mailman1971
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PostPosted: Wed Apr 29, 2009 1:39 pm    Post subject: Reply with quote

JKD wrote:
Man I wish those fuses were eternal Smile Am guessing you meant internal ??? Confused

'grats on being up and running again.

+1000 on that!
I was having a brain fart! Yes...wish they "lived forever" myself!
So eternal INTERNAL fuses.....who makes them?? Razz
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teetoo
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PostPosted: Thu May 07, 2009 3:01 pm    Post subject: Reply with quote

pete or anyone else in the know ,are the fuse locations the same for a T2 as in the above pics of the rm?
i have lost all sound from mine but the tubes are all still good so i think it mite be a fuse?
any suggestions ?
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jmgman70
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PostPosted: Thu May 07, 2009 3:13 pm    Post subject: Reply with quote

teetoo wrote:
pete or anyone else in the know ,are the fuse locations the same for a T2 as in the above pics of the rm?
i have lost all sound from mine but the tubes are all still good so i think it mite be a fuse?
any suggestions ?

Have you had the chassis out of the head shell?
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teetoo
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PostPosted: Thu May 07, 2009 3:19 pm    Post subject: Reply with quote

yes,but thats as far as i got.cant see any fuses so im assuming there under pcb's.
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jmgman70
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PostPosted: Thu May 07, 2009 4:16 pm    Post subject: Reply with quote

teetoo wrote:
yes,but thats as far as i got.cant see any fuses so im assuming there under pcb's.
anyway you could post a pic of this??
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joeymex
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PostPosted: Wed Sep 09, 2009 11:42 am    Post subject: help pleeease on internal fuses Reply with quote

Guys, I have searched and found nothing about the values of the internal fuses, can someone help here... I took them out but I can't read the fuse rating... I would really appreciate any help... I have this Randall unused for 6 months... using a Triaxis ... is not just fair Evil or Very Mad I know is something minor maybe cause by a tube but I just cant replace them... I am afraid I put something of wrong value and really f*&k this amp
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