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Old 29th December 2005, 10:39 AM   #1
diyAudio Member
 
Join Date: Mar 2005
Location: killeen, texas.
Default i need some schematics

hi all
i work for a small home based business that id just starting out. in the mobile electronic industry.
well we pretty much do installs of car alarms, remote starts, amps, subs, all the bling bling. and custome fiberglass enclosures.


i use to read on basic electronics and audio amplifiers but they where A/b class amplifiers never class d.
well sometime customers leave theyr burnt out amps when they purchase a new one from us. but since i have a small interest in electronics, i want to see if i can fix them maybe use all the parts and make a supper amplifier, lol, well, right now im stuck at the point that the amps are class d, and the pc boards are double sided wich makes it very dificult to see where the tracs are going to when you have big caps and coils covering them and every thing is so tight toghether.

im sure i can fix them if i can find the shematics for them,
so i need schematics, i have serched the net and forums with no luck on these amps.


this is what i have.

first one is a tsunamy DB1100D, i figured out that the power supply side works fine and its just the amplifier side of the amp thats inop. but since is a class d and double sided pcboard, i cant figure out whats wrong with the amp.
so if any one has a schematic for that amp so i can compleatly fix it. i woul a apreatiate it.

i also have an mtx thunder 6500D. that has a surface mount some thing that seems like it getting ready to fail and two mosfets that are damaged on the power supply i think,
a schematic for that one as well please.

one more i have a planet audio VX2200D
that has some thing wired going on, it had some power supply mosfets burnt out. so i order them and replaced them, so i hock the amp up to my power supply 13v 2amp max.. and the amp shuts down the power supply. with out appling power to the remote. and slowly but surelly it burnt the mosfets that i had replaced.
if any one could provide me with schematics, i would be greatly appritiated.

ps: i have search the internet for the schematics, and have also contacte some of the manufacturer and the say the dont give out their schematics.

thanks in advance for any help.

laters
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Old 17th January 2006, 09:06 PM   #2
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Best thing I could reccomend, is buy the amplifier repair guide, which will show you how to test any/all amplifiers once you know how they function. You probably are not going to find schematics for the amps, if you already went to the manufacturers, only thing I could say is learn how they work, they're not all that different. get some tools, and have at it. www.bcae1.com is the site where you can get the amp repair guide.
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Old 17th January 2006, 09:31 PM   #3
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Location: Louisiana
It's almost impossible to get schematics for car amplifiers except for the Japanese amplifiers (Pioneer, Kenwood, Sony...). Rockford is the only non-Japanese manufacturer that I know that provides schematics and they only provide schematics for obsolete models.

The class D amplifiers can be tough. Luckily, it seems like there are only a handful of manufacturers producing amps. You will see similar designs in many different amplifiers. After you learn the basics and get a little experience, it gets easier. The faults are typically in the output or driver stages. You'll also see a lot of broken and shorted inductors.

Some of the class D amps use proprietary modules that are potted in epoxy or covered in epoxy which makes troubleshooting difficult. If the module is defective, there's no way to repair the amp because replacements are simply are not available. For those amps, you have to send them back to the manufacturer.

Of the MTX class Ds I've seen (not many), they've been relatively easy to repair. The power supply and output sections have been simple repairs. Bad op-amps have been a problem as well as bad solder connections on the small transformer in the audio section.
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Old 18th January 2006, 12:34 AM   #4
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Location: killeen, texas.
thanks for the replies. i have been doing allot of reading on the class d amps and im getting a better understanding of them.

thanks for the link!.

Perry Babin your right about the modules covered in epoxy. that's how the tsunami is.

im still waiting for the mosfets for the mtx to get here. what gets me on that amp is that there's one surface mount resistor the size of a flee and i cant read the value of it, any trick on that?, i don't think ill be even able to desolder it from where its at, but its most definitely fried and in need of replacement.

im a keep at it.

laters
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Old 18th January 2006, 01:02 AM   #5
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If the resistor is burned, there may be no way to read it. Resistors that are not burned are usually easy to read with a lighted magnifier. If they're covered in soot (from FETs burning), try cleaning it with acetone and a cotton swab. Remember that acetone is very flammable. Use it in an area with plenty of ventilation and don't solder on it until your 100% sure that all of the acetone has evaporated.

To unsolder the resistor, apply new solder to both ends of the resistor. If the resistor does not release when applying solder to the it, try angling the iron so that the tip makes contact with both ends. It should then slide off with very little force. Be sure not to keep heat on it for more than about 2-3 seconds. There is very little copper to sink the heat and keeping the heat on the component for more than ~3 seconds can cause the copper to delaminate (depending on the quality of the board how hot your iron is).

If you have trouble getting your iron on it, you may have to remove surrounding components. If any of the large capacitors have to come out, there are a few things you need to know to remove them without damaging the board.

If the burned resistor is a gate resistor for one of the paralleled FETs, look at the other FET to see what value it's using. If there is no paralleled component, you'll need to find another similar amp. All I have here is a 1501D. I don't know if it's similar enough to yours to help.

When resoldering the components, it's recommended that you use silver bearing solder. Radio Shack has some (64-035).
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Old 11th July 2006, 01:11 PM   #6
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hi again.
i know im bringing this thread from the dead but i just didnt feel the need to start a new thread.

well i have this Thunder 6500d wich you can find pics here of the gutshere of the guts

i can take better pics if nessesary.
the problem is i belive on the power supply. i have replaced the burnt fets. but there are some smaller components that seemed burnt as well as stated on on of the above replyes i had removed the R628 resistor since it was burnt i trying measuring the resistance and it was very low, but im asuming that it was that low as a side effect to it over heating and burnig. i also removed a C630 wich i belive its a capacitor. but cant realy read the value of it. but it reads some thing like T1n0J 100 its yellow in color and rectangular chaped its in line with the gate lead of the switching fet. now i would like to replace these as well as the resistor that i removed.

i realy need a schematic. for this amp. i have the basic knowledge on class D, class A/B and class A amp but not enogh know how to fix this amp with out the proper value to these components. or what each little circuits on this amp is.

its a nice amp and i would like to learn how to fix it or if i could get some help from you guys on how to get this amp fixed. i dont personaly need it, but it would be a nice learning experiance for me.

i have some other amps laying around that i could borrow parts from if needed. or i can just buy the parts from mouser like i have done in the past.

any help will do.

but i just realy need a schematic to get the ball rolling on this.
thanks in advance for any help you can provide.

PS: if any one feel like fixing this for me in exange for a profesionaly built audio enlosure that will fit your needs let me know. we can figure something out.

laters
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Old 11th July 2006, 02:14 PM   #7
JoergST is offline JoergST  Germany
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Default Schematics or connection diagramm

Hello my name is Jörg and I read the threat and the differnt agrements. I think the link to www.bcae1.com is good, but it is not easy to understand when your english is not so good. I´m from germany and I have some difficults to understand the text. The same with this thread. Not everthing that was written I understood. But the main reason I think is to get some schematics or connection diagrams, because than you can look at the circuit and know which construction units are build in the amplifier. Than you have the chance to download the datasheet from some construction units and you know how the work.
I got here a connection diagramm for a Alpine 3566. And it was great. I have some other connection diagram from Denon, Axton,Magnat, Alpine and AMA,JBL, Blaupunkt. SO everytime I look for new diagramms to collect them.

Now I have to amplifiers they didn´t work. A Eyebrid 4Y80 and a helix. And the errors are very difficulty for me.

By the helix I need a connection Diagramm, because I didn´t know what I can do to find the error. the same is fpr the eyebrid.

Regards Jörg
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Old 11th July 2006, 02:16 PM   #8
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Location: Louisiana
You should start new threads instead of using old threads.

The resistor is 47.5 ohms.

Check R625 and R626. Also check the two PZTA56 transistors just above the two resistors.

The cap should be a 1 nanoFarad 100 volt.

You won't find a schematic.

Did the output transistors survive? If not, what were the original part numbers?
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Old 11th July 2006, 02:32 PM   #9
JoergST is offline JoergST  Germany
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Default For Perry Babin

Sorry Perry, do you mean me?

What do you want to say with this?


"The resistor is 47.5 ohms.
Check R625 and R626. Also check the two PZTA56 transistors just above the two resistors.
The cap should be a 1 nanoFarad 100 volt."

for which topic or thread it goes?

and what is the meaning of this?

"You should start new threads instead of using old threads".
I only say something to the connection diagramms and this was my opinion how difficult it is to repair some amplifier without a diagramm. :-)
Regards Jörg
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Old 11th July 2006, 02:45 PM   #10
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Hi JoergST,

The reply was to the questions about the 6500D from boricuaso. You replied between the time I started my reply and the time I posted it.

If you have a question about something, you should start a new thread instead of adding to an old thread. It's less confusing and you're more likely to get a relavant reply. It also prevents attention being drawn away from the original poster's question.

I didn't have anything on the eyebrid amp. It may be similar to a schematic I have but I'd need to see the inside to know for sure. If you email me a clear photo of the internals, I'll see if I have something.
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