Hello all
The problem is a Yamaha p2200. One channel has 80vdc on the output and its not going away buy itself. I have checked the power supply and i belive it is getting the right amount of power. There is no visible damage to the board or any capacitors/resistors. Im wanting to know how to test the output transistors with a multimeter. My meter has a transistor tester on it however its designed for very small transistors and the output transistors wont fit in it.
II have another question which might get some people thinking.
The input of this amp is 4dbm i belive as it is a professional amp at 230w/8ohm a channel. Now my cd player output is something like -20dbm i belive. SO when i plug my cd player into it is really quiet. - Any suggestions.. . .
What i have done is plug my cd player into my hifi amp (around 30w) and pluged the speaker terminals of my hifi amp into the input of the yamaha power amp. . Can this do damage?? IT works but im not sure if it is correct? Does anyone no where to get a preamp or how to build a preamp with a 4dbm output??
Thankyou
Daniel
The problem is a Yamaha p2200. One channel has 80vdc on the output and its not going away buy itself. I have checked the power supply and i belive it is getting the right amount of power. There is no visible damage to the board or any capacitors/resistors. Im wanting to know how to test the output transistors with a multimeter. My meter has a transistor tester on it however its designed for very small transistors and the output transistors wont fit in it.
II have another question which might get some people thinking.
The input of this amp is 4dbm i belive as it is a professional amp at 230w/8ohm a channel. Now my cd player output is something like -20dbm i belive. SO when i plug my cd player into it is really quiet. - Any suggestions.. . .
What i have done is plug my cd player into my hifi amp (around 30w) and pluged the speaker terminals of my hifi amp into the input of the yamaha power amp. . Can this do damage?? IT works but im not sure if it is correct? Does anyone no where to get a preamp or how to build a preamp with a 4dbm output??
Thankyou
Daniel
Never connect speaker outputs to line inputs.
4db is 1.23V is the max voltage that can be applied to the input without clipping the output.
Speaker outputs are a magnitude more than that and will cause harm to your power amp input, if not blow it away completely. Maybe that's exactly what happened.
You need a preamp or a mixer to connect in between.
Look at the users manual
here
As for your first question: this is a good explanation how to measure transistors.
Keep in mind that such power amps will not be easy to repair yourself if I may assume your still a newbie to electronics
/Hugo
4db is 1.23V is the max voltage that can be applied to the input without clipping the output.
Speaker outputs are a magnitude more than that and will cause harm to your power amp input, if not blow it away completely. Maybe that's exactly what happened.
You need a preamp or a mixer to connect in between.
Look at the users manual
here
As for your first question: this is a good explanation how to measure transistors.
Keep in mind that such power amps will not be easy to repair yourself if I may assume your still a newbie to electronics
/Hugo
As above, conencting speaker ouptuts to line inputs is a big nono unless you know the amp supports that form of bridging. Most do not, and I highly doubt yours does.
May I suggest purchasing a cheap DJ mixer to match levels, or constucting/purchasing a small active opamp circuit to match gain to the level needed.
Alternatively find a cd player with higher output
Power amps are not rivial to repair and can give you a nasty shock if youre not careful. Depending on your experience level you may just want to get someone else to look at it.
May I suggest purchasing a cheap DJ mixer to match levels, or constucting/purchasing a small active opamp circuit to match gain to the level needed.
Alternatively find a cd player with higher output
Power amps are not rivial to repair and can give you a nasty shock if youre not careful. Depending on your experience level you may just want to get someone else to look at it.
umm... preamp???????
Gday,
Im yet to try testing the transistors. As far as the plugging amps into amps go, i wasnt totally sure if it was any good for it.. aparently not, it sounded good though. ANyway for the preamp thing, they seem to be hard to come buy. I bought a mixer off the net, and it is totally fully of siht. I recons 0db is coming out of it when there is no way that much power comes out of it. Where could i get a preamp or something from. I never heard of a cd player that could go that LOUD. cause when i was testing the power amp with my hifi amp i almost hand it cranked right up(30w into 8 ohm) Now heres another question, on the back of the amp it says " Input 100w 8ohm Unbalanced" What does that mean, it gave me the idea to plug in my hifi amp but im not doing that again. As for how it originally blew up, i have no idea, i bought this for 212.50 of ebay aus. and one channel wasnt working. It has a built in bi-amp system which is interesting and the channel that blew was the channel that was used for Low frequencies (no surprise there)
Thanks for your responses. Id like any info if anyone has it on preamps that have the 4dbm output cause the net is useless as far as preamps are concerned. Im wanting to plug my computer into this amp so i need some kind of amp inbetween. THanks
Daniel
Gday,
Im yet to try testing the transistors. As far as the plugging amps into amps go, i wasnt totally sure if it was any good for it.. aparently not, it sounded good though. ANyway for the preamp thing, they seem to be hard to come buy. I bought a mixer off the net, and it is totally fully of siht. I recons 0db is coming out of it when there is no way that much power comes out of it. Where could i get a preamp or something from. I never heard of a cd player that could go that LOUD. cause when i was testing the power amp with my hifi amp i almost hand it cranked right up(30w into 8 ohm) Now heres another question, on the back of the amp it says " Input 100w 8ohm Unbalanced" What does that mean, it gave me the idea to plug in my hifi amp but im not doing that again. As for how it originally blew up, i have no idea, i bought this for 212.50 of ebay aus. and one channel wasnt working. It has a built in bi-amp system which is interesting and the channel that blew was the channel that was used for Low frequencies (no surprise there)
Thanks for your responses. Id like any info if anyone has it on preamps that have the 4dbm output cause the net is useless as far as preamps are concerned. Im wanting to plug my computer into this amp so i need some kind of amp inbetween. THanks
Daniel
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usermanual
I have looked in that usermanual 60 pages!!! it doesnt tell u much. It just blabs on about how good it is. And so ive figured already that normal hifi equipment is about -20dbm and this amp needs 4dbm so i need an amp of some kind. Can anyone give me a company? A website? A kit? A circuit? Thanks
Daniel
I have looked in that usermanual 60 pages!!! it doesnt tell u much. It just blabs on about how good it is. And so ive figured already that normal hifi equipment is about -20dbm and this amp needs 4dbm so i need an amp of some kind. Can anyone give me a company? A website? A kit? A circuit? Thanks
Daniel
Ok thanks for the link to that transistor testing page. I found a f2n3055 transistor laying around and tested according to the page and it checked out. However my multimeter came up with 500 on the screen instead of 4-5volts. I dont know how my meter works. Its a q-1447 DSE if anyone has a similar model maybe they can tell me why my meter reads like this on diode mode. Anyway if anyone knows the specs on the output transistors on the p-2200 Yamaha power amp thatd be great. I dont even know if they are NpN or PNP , all i know is the Yamaha guy in melbourne told me they cost 30 bucks each!!!
CYA
Daniel
CYA
Daniel
Re: usermanual
IMHO the manual goes much further than a normal users manual should go. It's extremely well detailed and gives a lot of info about hook-up and is a great source of knowledge.
The preamp you're looking for depends on what the amp will be used. This is a typical PA-amp. Can be used in the house but it depends on your expectations. Much db's or a nice clean sound.
Or both
This amp deserves a good mixer, don't buy the cheap ones.
Ecler or Pioneer comes to mind as good value for money mixers. If you go for a normal preamp, browse the forum, you'll find tons of them.
Where does the 4-5 volt come from? Your meter indicate 500mV, thats 0.5V which is ok for a diode test.
What power transistors are inside?
/Hugo – would bring the amp to a repair center…
priscared said:
IMHO the manual goes much further than a normal users manual should go. It's extremely well detailed and gives a lot of info about hook-up and is a great source of knowledge.
The preamp you're looking for depends on what the amp will be used. This is a typical PA-amp. Can be used in the house but it depends on your expectations. Much db's or a nice clean sound.
Or both
This amp deserves a good mixer, don't buy the cheap ones.
Ecler or Pioneer comes to mind as good value for money mixers. If you go for a normal preamp, browse the forum, you'll find tons of them.
Where does the 4-5 volt come from? Your meter indicate 500mV, thats 0.5V which is ok for a diode test.
What power transistors are inside?
/Hugo – would bring the amp to a repair center…
heres a photo
Gday
i think ive solved my preamp problems , found an old yamaha soundcard lying around, sounds like **** but it works ok.
If anyone thinks they can help me out fixing my Yamaha amplifer, please search this forum for "priscared" as i have made 3 threads about it.
A website told me thats how to test transistors and that 4-5 volts should show up on the screen...
Also check out www.geocities.com/elphocfa/yamaha/
Gday
i think ive solved my preamp problems , found an old yamaha soundcard lying around, sounds like **** but it works ok.
If anyone thinks they can help me out fixing my Yamaha amplifer, please search this forum for "priscared" as i have made 3 threads about it.
A website told me thats how to test transistors and that 4-5 volts should show up on the screen...
Also check out www.geocities.com/elphocfa/yamaha/
Attachments
Buy three pair of MJ21193/94 outputs and one pair of MJE15032/33 drivers per channel, throw away the junk in the amplifier without testing.
The cost per channel of the above parts is about USD$14
Flameproof and fusible resistors cost about $0.10 each for small ones and $0.50 for the 5W size. 1/4W and 1/2W films are about $0.05 each.
Just scape everything off and start over.
The cost per channel of the above parts is about USD$14
Flameproof and fusible resistors cost about $0.10 each for small ones and $0.50 for the 5W size. 1/4W and 1/2W films are about $0.05 each.
Just scape everything off and start over.
MJ and MJE are Motorola type numbers, now ON Semiconductor.
http://www.onsemi.com/site/products/summary/0,4450,MJ21194,00.html
http://www.onsemi.com/site/products/summary/0,4450,MJE15032,00.html
The part numbers listed are the best types in their case style for new build, and for general replacement use.
The suggested resale price from a wholesale stocking distributor is about $2 each on the outputs, and about $0.80 on the drivers. If you buy in manufacturing quantity big discounts are available.
In the US I buy from Future Active or Newark. Check the ON Semiconductor site for local distribution.
http://www.onsemi.com/
($30 each for outputs is a BOHICA price)
http://www.onsemi.com/site/products/summary/0,4450,MJ21194,00.html
http://www.onsemi.com/site/products/summary/0,4450,MJE15032,00.html
The part numbers listed are the best types in their case style for new build, and for general replacement use.
The suggested resale price from a wholesale stocking distributor is about $2 each on the outputs, and about $0.80 on the drivers. If you buy in manufacturing quantity big discounts are available.
In the US I buy from Future Active or Newark. Check the ON Semiconductor site for local distribution.
http://www.onsemi.com/
($30 each for outputs is a BOHICA price)
ok the outputs
Ok the six huge output transistors mounted on the heatsink are:
3 X 25ci586 090 San Ken
and
3 X 25A909 050 San Ken
So which of the motorolla parts replace which transistors, the part number you gave me could only replace one of these sets of three couldnt it?
Anyway as well as those parts being blown there are a bunch of little transistors on the board blown and some fusing resistors.
Thanks For your help
Daniel
Ok the six huge output transistors mounted on the heatsink are:
3 X 25ci586 090 San Ken
and
3 X 25A909 050 San Ken
So which of the motorolla parts replace which transistors, the part number you gave me could only replace one of these sets of three couldnt it?
Anyway as well as those parts being blown there are a bunch of little transistors on the board blown and some fusing resistors.
Thanks For your help
Daniel
tested transitors
ok i tested the transistors on the output stage. Well the guy who i paid $30 to tell me it was stuffed did abad testing job. Even me with little experience can pick out the dodgy ones with my diode test. ANyway i only need one 2sc1586 090 or equivalent which is a SI-N/250V/15A/150W/10MHZ . And i need 3 2sa909 050 which i dont know its specs. Please help. THankyou
Daniel
ok i tested the transistors on the output stage. Well the guy who i paid $30 to tell me it was stuffed did abad testing job. Even me with little experience can pick out the dodgy ones with my diode test. ANyway i only need one 2sc1586 090 or equivalent which is a SI-N/250V/15A/150W/10MHZ . And i need 3 2sa909 050 which i dont know its specs. Please help. THankyou
Daniel
Useful chart
Japanese Semiconductor part numbers that conform to JIS nomenclature provide useful information about the type of device.
The first character is a numeral which is one less than the effective number of electrodes. Therefore, diodes will begin with '1', transistors with '2'.
The second character is always 'S' to indicate the product is a semiconductor. The third character indicates the type of semiconductor:
A High Frequency PNP Transitor
B Low Frequency PNP Transistor
C High Frequency NPN Transistor
D Low Frequency NPN Transitor
J P Channel FET
K N Channel FET
S Small Signal Diodes
Using this information, we can work out that a 2SC 1964 must be a HF NPN transistor, and 2SK 134 will be an N channel FET.
Japanese Semiconductor part numbers that conform to JIS nomenclature provide useful information about the type of device.
The first character is a numeral which is one less than the effective number of electrodes. Therefore, diodes will begin with '1', transistors with '2'.
The second character is always 'S' to indicate the product is a semiconductor. The third character indicates the type of semiconductor:
A High Frequency PNP Transitor
B Low Frequency PNP Transistor
C High Frequency NPN Transistor
D Low Frequency NPN Transitor
J P Channel FET
K N Channel FET
S Small Signal Diodes
Using this information, we can work out that a 2SC 1964 must be a HF NPN transistor, and 2SK 134 will be an N channel FET.
progress
RS australia seem to sell everything
MJ15023 is the same as the 2sa909 i hope sells for $8au
MJ21194 is the same as the 2sc15186 i hope and sell for like $10.
I found i replacement capacitor i think for $30. NOw to find fusing resistors, i think they were like 0.50. and then find some more little transistors. lol. THis is gunna take a while.
RS australia seem to sell everything
MJ15023 is the same as the 2sa909 i hope sells for $8au
MJ21194 is the same as the 2sc15186 i hope and sell for like $10.
I found i replacement capacitor i think for $30. NOw to find fusing resistors, i think they were like 0.50. and then find some more little transistors. lol. THis is gunna take a while.
amp for sale Yamaha p2200
Ok, my amp is for sale.
230w 8ohm rms continuois sine wave input. One channel is broken. One supply cap will need replacing.
Yamaha guy in bendigo said on average the broken channel in this amp cost $150 to repair. JKL capacitors quoted me around $150 for 2 new supply caps including postage (depends on aussie dollar of course) I no longer need this as i got myself a soundking amp and i am now working almost 50 hours a week so yeah... There is NO glue on the caps!! It is all there, the case looks like it woulda new. I am after $200 ONO. DOnt hesitate to ask questions.
www.geocities.com/elphocfa/yamaha
Daniel
Ok, my amp is for sale.
230w 8ohm rms continuois sine wave input. One channel is broken. One supply cap will need replacing.
Yamaha guy in bendigo said on average the broken channel in this amp cost $150 to repair. JKL capacitors quoted me around $150 for 2 new supply caps including postage (depends on aussie dollar of course) I no longer need this as i got myself a soundking amp and i am now working almost 50 hours a week so yeah... There is NO glue on the caps!! It is all there, the case looks like it woulda new. I am after $200 ONO. DOnt hesitate to ask questions.
www.geocities.com/elphocfa/yamaha
Daniel
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