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 Post subject: M100 Schematic
PostPosted: Thu Nov 01, 2018 1:26 pm 

Joined: Mon Jun 11, 2018 10:13 am
Posts: 26
***Edit*** Can I just get a schematic from someone? I opened up another M100 yesterday and it has been modified as well. I would like to take a look at the schematic to see what has been modified and how I can rectify it correctly with the correct parts. Let me know if this isn't possible and ill just move on. I am almost ready to toss these two M100s in the trash...I feel like the two that I have are the two that looked great on the outside and that is where great things ended. Open them up and it is a different story.

Hey everyone, can someone tell me the values for the capacitors in C7/C15 on the M100 board? They are the same but I am having trouble reading the value on the cap and for the life of me, I cannot find anything with the markings I think they are. 103 M3(or 5)C is the marking I think that is on there.


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 Post subject: Re: M100 Schematic
PostPosted: Fri Nov 02, 2018 9:38 am 

Joined: Tue Nov 06, 2012 9:30 pm
Posts: 99
Isnt the M100 a combination of the m50 and m25? If so, C7 on my m50 is 474 m58 and c15 is 10uf 16v

Jcampbell is the guy to ask though.

Sent from my SM-G960U using Tapatalk


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 Post subject: Re: M100 Schematic
PostPosted: Fri Nov 02, 2018 12:52 pm 

Joined: Sat Aug 06, 2011 1:18 am
Posts: 63
I opened up mine:
C7 : 103 M5C = 0.01µF I think it will be 50V but I can't confirm that, you need the schematic for that.
C15 I can't find. Can you tel where exactly it is on the board?


Last edited by Silverhorse on Sat Nov 03, 2018 2:34 am, edited 2 times in total.

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 Post subject: Re: M100 Schematic
PostPosted: Fri Nov 02, 2018 1:49 pm 

Joined: Mon Jun 11, 2018 10:13 am
Posts: 26
Too right


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 Post subject: Re: M100 Schematic
PostPosted: Fri Nov 02, 2018 3:08 pm 
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Joined: Sat Apr 19, 2008 11:57 pm
Posts: 1435
Location: Beaverton 48612
These two capacitors perform very different jobs, but they are the same parts. Neither of these two should prevent the amp from working.

C15 is part of a snubber network, the 103 is the only relevant info on these types of caps, the first two digits are the first two of the value, and the third digit is the number of significant digits. The values are in picofarads. 103 is 10,000 picofarads, or .01uF. the stock part is almost certainly 50v rated, but I normally use ~100v ceramics. Voltage rating isn't nearly as critical on ceramic caps as other technology, but going higher also doesn't hurt anything.

C7 capacitively couples primary ground and secondary ground. If it is bad you may have all kinds of high frequency noise on the outputs, but the amp will still work. It too is .01uF, 50v is sufficient, but you can use higher if you like.

The rest of the stuff on ceramic caps varies by manufacturer, but one of the letters is likely the tolerance, and the rest is date or lot code. Just buy at least +/-10% caps and you will have better parts than most manufacturers ever used. Neither of these are critical so if you wanted cheaper 20% parts, you can with no I'll effect.

Good luck,
Jason



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 Post subject: Re: M100 Schematic
PostPosted: Sat Nov 03, 2018 2:32 am 

Joined: Sat Aug 06, 2011 1:18 am
Posts: 63
Hello Jason

didn't know that the third digit is the number of significant digits. So learned something new today. Thank you! :D


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 Post subject: Re: M100 Schematic
PostPosted: Sun Nov 04, 2018 4:53 am 

Joined: Mon Jun 11, 2018 10:13 am
Posts: 26
Thanks for the reply. I finally had a moment where I thought of using my macro lens on my dslr and magnified the picture where I could read the whole code. Found the caps and we are good to go. I took the rectifiers out and troubleshot the issue down to a bad irfz44. It’s been fun dealing with this issue. I’ll be replacing the components today to see if I get a green light. Thanks again.


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 Post subject: Re: M100 Schematic
PostPosted: Sun Nov 04, 2018 6:06 am 

Joined: Sat Aug 06, 2011 1:18 am
Posts: 63
The M100 amp in 4 ohm configuration deliver the goods like few others even today. They are worth the trouble...


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 Post subject: Re: M100 Schematic
PostPosted: Sun Nov 04, 2018 6:33 am 

Joined: Mon Jun 11, 2018 10:13 am
Posts: 26
I have the M50 in the place that the M100 will go right now and it sounds incredible @ 4 ohms coupled to a JL 10w6v2. I am excited to get the M100 rocking two of them. I have a pair of really nice XMAX 12's that may take the place of the JL's...thoughts? I am a sealed box guy and I think the JL's are overkill but I am not married to either.


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 Post subject: Re: M100 Schematic
PostPosted: Sun Nov 04, 2018 7:40 am 
the Floor Sweeping Hack with Golden Ears

Joined: Fri Dec 19, 2008 9:53 pm
Posts: 14383
Silverhorse wrote:
Hello Jason

didn't know that the third digit is the number of significant digits. So learned something new today. Thank you! :D


He has taught a lot of us a lot of stuff.



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