Yamaha M-2 Power Amp Repair - One Channel Not Working
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- čas přidán 15. 07. 2017
- M-2 is a 240W/channel X2 audiophile power amplifier. This is a complex job that takes a lot of time, patience and skill. However, It is a wonderful experience when I look back for the entire repairing process. I hope this video can help others who also have the same problems on their amplifiers.
Really a great job. My best compliments!
instablaster...
Nicely done I respect the work
Very good work, i like your audio toys.
On the drums...Mr. Joe Morello!🤘
I have the same amp, also one channel out but I can't find a place to buy the fuse resistors or the outputs. I keep missing something on my repair job because it keeps blowing the secondary power supply fuses, not the mains.
I bought my fuse resistors from Mouser Electronics: www.mouser.com. Please let know if need any other helps.
I was successful in repairing my amp. One channel finally went out again but this time I can't find out why dc balance and bias pots don't alter the voltage. All zero. Everything else checks out fine. Maybe the jfet 2sk146?? Any ideas where to look on the pcb's? I am missing something somewhere
I have an Yamaha. One channel has no sound through speakers. Yet both channels are ok through headphones. Level meters are also working.
What could be problem??
According to your descriptions, there are two possible scenarios in your amplifier: (1) your Yamaha has a separate built-in headphone amp, (2) there is a bad contact in the speaker (protection) relay or selector switch. Could you give me the model number so I can help you troubleshooting the problems more precisely?
Please help, just bought the Yamaha CX-1preamp and the left channel not working after 3 minutes of playing. Thank you!
Please send your inquiries to my email which is listed in "Details" under category "ABOUT" in my CZcams home page - "Vintage Audio Fan". It will be great that you can describe the problems which you have and send it with the photos (it may be helpful to identify the issues).
nice amp!
Where do you get the replacement semiconductors?
I have done some homework before buying the power transistors for my M-2. I found the price of MJ15022/15023 or 2SC1586/2SA909 ( replacements for 2SC2461/2SA1051) were very reasonable on eBay. Since then, I have been buying the transistors, diodes and zeners from eBay.
Hi,what model the replacement led bulbs have to be?8v,12v and how many mAmps?Thank you in advance.
The service manual shows the meter lamps require 12V 60ma bulbs. I purchased mine from eBay (no specific MFR/MODEL#). Please see my first B-2 repair video for installation details.
@@VintageAudioFan Note that LEDs have a big effect on the color. The correct incandescent bulbs give you an orange button (when lighted) and two greens, instead of one white and two blue green.
Nice amp!!! Some old Yamaha!
M-2 is capable to bring up the maximum potential of any speakers. In the past, I almost gave up a pair of B&W Matrix One speakers since I can't find a good power amp to match. I have tried Marantz 250, Mark Levinson ML9 or Audio Research D115, but none of them worked. it changed my mind after I used M-2 as the power amp. I just can't believe M-2 can do such magic bring my Matrix One to life again. The Yamaha M-2 for sure is a keeper.
same amp as a PC2002 pro amp in a domestic amp box.......
Vintage Audio Fan I have the Yamaha M-4 amplifier. Can it drive demanding speakers as well as the M-2 ?
@@JuanCarlos-zd5th Sorry for missing your comments. I own M-2 but not M-4 so I can't compare them. The M-2 can drive low efficiency electrostatic speakers without problems.
So why use heat shrink on the LED but not the spliced connections? Why didn’t you check/replace caps? Probably falling out of spec too.
Recap will improve amp's performance greatly. The heat shrink on LED light was made by manufacturer. The wire spliced connection just a temporary fix.
Just purchased a (Yamaha xm4220 power amp) and red light protection is on, channel d clip light is red also - do you know what this could be? any help would be appreciated. Thanks
There are two possibilities cause the speaker protection to activate: (1) Defective power amps (XM4220 has 4 channels) which you need to check their outputs ensure the voltage is close to 0 V. (2) Defective protection circuit which also will cause it malfunctions. I suggest to perform the item #10 Protection Circuit Test on page 24 of XM4220 Service Manual.
If protection circuit works fine, then check all outputs of ea. amp. I think you can find the defective channels and fix them.
@@VintageAudioFan Thanks for the speedy reply - I'm not a service guy so might find that a bit tricky but might give it a go as have nothing to lose - if you have any tips let me know - thanks again for the advice
@@dal160 I understand that this type of work is not easy for a beginner. Hopefully, I can explain it more clearly in my new videos. In fact, I am planning to release more videos regarding the repairs of amplifiers (in protection mode). Please check up them which may help fixing your amp.
i have this amp and like it a lot...🎶
I enjoyed this and thank you. How do you rate this amp?
Yamaha M-2 is one of the best power amplifier I have ever owned. In fact, I am using it in my primary stereo system which includes a pair of electrostatics speakers. It fits very well to my speakers which is power hungry and very hard to drive. I have tried other named brand amplifiers but none of them works better than M-2 in my system so far.
@@VintageAudioFan Thank you for the reply.
@@VintageAudioFan
Just bought one tonight and wander if you know are the front meters actually green lights or do they have a green filter gel to make them green? Do you have any suggestions for me on what maintenance to initially do to this amp and I'm not an electrician but have mechanically can do things as I have restored quite a few cassette decks, reel to reel and TT through the years.
It is a legendary amp. I agree, best amp of any type that I've ever heard.
I build single ended tube amps because they are simple and easy to fix and work well for jazz.
There is a misconception that tube amps sound "warm" and fuzzy...not freshly built ones. They are clear, detailed and airy. The M2 sounds like a good tube amp. It's amazing and I wish I could have kept it, but the previous owner who sold me a C2a and M2 for $250 total (because he got them at an estate sale or something and they weren't working properly).
I felt that I owed it to him to sell it back to him, since I didn't need the power for my room, speakers and music. Still have the C2a though.
what power fuse do i replace on my Yahmaha M2 amplifier...its a very small glass tube fuse
The two fuses located at AC power socket are 7A 125V UL SS-2 normal-acting 6.35×31.8 mm cartridge fuses. Also there are 6 fuses (same size) in the power supply PCB: F651,F652 ,F655 & F656 are1.5A 250V and F653 & F654 are1.0A 250V.
@@VintageAudioFan
I only know of one fuse on the M2... I replaced it and now my unit powers up normal
20mm 6.3A very small glass tube... you talk about a lot of fuses on the unit…?... maybe you can do a video to show where all these fuses are on this amplifier?
There are 6 other fuses which are located on the power supply PCB behind the front face panel. I can show you with the photo if you send me the inquiry thru my email (listed in my home page under "About").
@@VintageAudioFan
ok...thanks for the pic...but i don't see 2 fuses at the power socket?...When i turned the unit upside down, I seen one fuse 6.3A 20mm that I replaced and the init is working normal now🥂🍾🎊
wish you lived close...I would feel comfortable if any of my gear needed repaired or refurbished...
Thank you. Please send me your request via email and I will help you the best I can.
you just "find " an awful lot of "unfindable" components there mate...... would love to know where you you "just find " them at..........i need some.....
Thank you for your comments. Generally, I check the component's data (for example: transistor's Vcb, Vce, Ic, Pc and hfe) first. If I can't find the original or OEM to replace them, then I will buy substitutes which with same or similar data. I also buy non-functional vintage amps/receivers in order to strip their parts for spare use.
@@VintageAudioFan Yep...seems to be the only way .....unfortunately, these days, everyone is asking double premium prices for anything at all, working or otherwise......... more and more stuff is going to end up on the tip as unviable to repair at this rate which is a shame...... especially for amps like this which is a PC2002 pro amp in a domestic box.......great sounding amps and built like tanks, unlike todays chinese tat which is throw away usually after just a few years unless you pay thousands for quality........ sigh !!!
What song is played at the end in the test? Thanks in advance!
The famous songs of three blind mice Vol. II : Track 2 - "Play Fiddle Play" by Isao Suzuki Quartet + 1.
Thanks for this. I just got one of these and the bulbs are out except for the "B" speaker. Looks easy enough.
It's better to replace all three with LED bulbs. They last forever. The M-2 sounds amazing even with my low-efficiency Acoustat electrostatic speakers.
@@VintageAudioFan That's exactly what I'm going to do. And yes, it's pretty amazing. Sounds much sweeter than my MX-1, I feel. Can't wait to pair it with the C-4 preamp after I get a button to stop sticking on it.
I have an M-2 for sale $1000 obo.
Big amp lots of power yet shit music test!! Need bass to try that out on some heavy duty bass bins. Always jazz music for big amps wtf!!
I respect your opinion on the music, me myself like that song but tired of hearing it in every stereo video. I share this with you because this time I looked beyond the song and learned something about the repair. I don't have high end stuff but it sounds high end to me after l done my repair work my self.
Music test not up to Nigel’s standards. When Nigel listens to you tube videos showing amp repair, Nigel wants to hear some bass in his headphones!
On the drums...Mr. Joe Morello!🤘