Yamaha M50 amp went tilt??? - diyAudio
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Old 19th August 2007, 04:33 PM   #1
Coyote is offline Coyote  Canada
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Default Yamaha M50 amp went tilt???

Good morning everyone,
Be kind Im a newbie here.
First impression is that the forum is very knowledgeable!
I will have to come back and browse more, specially the tube amp section :-)
But the problem at hand is as follow:
I am using a Yamaha M50 on the home theater I love this Amp.
bought it new a few years ago...
Never been abused.
Yet yesterday it went tilt.
Just was paying a movie and it went click and died, not hot or anything...
So this morning I removed it from the rack and was expecting a fuse on the back panel or something, but I could find nothing.
The service manual is long gone.
1- question, is there a fuse on this amp? Where would it be, what else can I look for???

2- Anyone knows a good repair shop for such a unit in the sought / west end of Toronto Ontario???
:-(

I love this Amp any help will be appreciated.


thx.

Alain
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Old 19th August 2007, 08:44 PM   #2
Bigred is offline Bigred  Canada
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Hey Alain,

It figures, I have the M40&M60 service manuals no M50. There is certainly gonna be a fuse between the power switch and the transformer. Its probably gonna be something like a 10amp (the actual rating will be stamped on one end and probably labeled on the PCB where its located also (which probably won't be to far away from the Transformer or near the back of the unit where the power cord comes in). You will have to pop the hood to access it. Just keep in mind that fuses blow for a reason. You risk causing more damage by just replacing the fuse. If it IS blown check whether it was a "light" blow or violent (glass black inside). If it was light then you could try replacing it. Too bad I'm about an hour outside of Toronto or I'd love to help ya out. Since you asked about a shop I would suggest you just bring it to one. Hopefully someone can recommend a reputable shop in your area.
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Old 21st August 2007, 12:14 AM   #3
Coyote is offline Coyote  Canada
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Default thx Big Red

all ready then,
I will "pop the hood" and look for a fuse.
I might have blown because the door on the rack was closed which I do not do often.
maybe someone will come up with a good local shop that remembers these units.

Cheers,
a
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Old 21st August 2007, 01:06 AM   #4
Bigred is offline Bigred  Canada
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Well poor ventilation especially if you were driving it hard could pose a problem. Most reputable shops would be able to help you but might be best with Yamaha authorized service centers. ==>Ontario (search for closest for your area)http://www.yamaha.ca/av/CustomerServ...rvice2.jsp#ON.
They would have access to service info and any bulletins. If you insist on locating the fuse and replacing, do a favour and report the condition of the fuse before replacing or better yet post some pics.
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Old 22nd August 2007, 05:46 AM   #5
anatech is offline anatech  Canada
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Hi Alain,
I'm in Georgetown, so much closer to you. I used to service Yamaha under warranty. Nice amp. They were reliable.

Let me know if I can help you out. Most of the newer service depots will not understand that amp. You can also give Rick at Ontario Audio a call. He's in Brampton.

-Chris
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Old 22nd August 2007, 12:23 PM   #6
TroelsM is offline TroelsM  Denmark
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Hi.

If you think that the M40 and M60 are similar to the M50 I would like an electronic copy of the service-manuals. - If it's no to much trouble that is.

Regards TroelsM
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Old 15th September 2008, 11:02 AM   #7
slowpat is offline slowpat  United States
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Unhappy Yamaha M-50 going up in smoke

Hi - I am a newbie, so not sure if this thread is still being looked at. I just bought a Yamaha M-50 amp last week, plugged it in, and was running it for less than an hour when there was a loud pop, and white smoke started spewing out. However, the music continued playing! But I shut off everything at once in case something else starts to go.

Popped the cover, and found this rectangular .22 uf capacitor that was cracked and burnt on the vertical PCB right by the power transformer. I think that is part of the power supply board. I don't have the service manual, and I am afraid to plug it in, so any help is appreciated. I have an M-80 and just love the series.

Thanks.
Patrick
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Old 15th September 2008, 11:19 AM   #8
Mooly is offline Mooly  United Kingdom
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Hi,
Have you got the voltage selector or tappings ( If there are any set correctly ) . Sounds strange for a non polarised cap to go up- but it can happen.
Would have to see circuit to see what it does. Sounds very suspicious as if it's been over volted to me.
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Old 15th September 2008, 02:27 PM   #9
Coyote is offline Coyote  Canada
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Default Over voltage

Good day everyone.

First thank you all for the replies.
A quick update on the M50.
I found someone who used to have an audio shop in the west end of Toronto. (near Kipling subway of you are from the area).
He confirmed that the circuit was over loaded and was able to fix the unit.
I also learned that Ontario Hydro apparently has power spikes that are quite severe compared to other power Co. I can only compare to Hydro Quebec and BC Hydro. My Computers are plugged to a UPS and I never had issues but this Amp was connected to a small power bar only.

Again Thank you all,
I keep wathching these treads as you never stop to learn stuff.
Great site!
Alain
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Old 15th September 2008, 09:43 PM   #10
slowpat is offline slowpat  United States
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Default M-50 cap going up in smoke

Hi Mooly - thanks for your response...the M-50 does have a voltage selector in the back, but it's set to 110/120 for the states here. The only thing I can think of is that the previous owner said he had it in storage for a couple of years, so not sure if the environment was ideal.

As I described, it was working fine for about half an hour, and it was plugged into a Belkin surge protector strip. Now, since the amp was continuing to run after the smoke, can I try it again w/ the burnt cap? Do you think some other component may have caused the surge? And where would I even find a replacement cap - and will it need to be in that shape? Can it just be a modern cylinderical shape as long as the value is close? a 250V cap. Any advice is greatly appreciated. Thank you.
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