Just found your channel, i love electronics troubleshooting, funny to see how others do the troubleshooting. Please keep making videos. Thanks a lot, subscribed. Greatings from Denmark
I just picked up a Peavey power amplifier.. Plugged it in.. It powered on for a second, made the lights in my house flicker, then blew the back fuse... Would shorted transistors cause it to blow a fuse?!?
Hi good day I have a q.s.c plx3602 problems.... the problem is the relay clicking on for a few minutes and clicking of it comes on for a few minutes and of I don't know what causing that problem can you let me what can I do
Hey! I have a plx2402 that works alright but when I turn it off, one of the channels (just n2) creates a very loud pop. I connected the output of it to a scope and saw a very big spike at turn off. I have 167.5V at each rail of the power supply (measured across the big blue eletrolytics). Signal at normal operation is clean and both channels are matched. I would like to know your opinion on this. What should I suspect? Many thanks
Hi i am getting a problem with my QSC P LX 3402 no power but all the fuse is good and all the output transistor is good and all the regulator is good what you think could be the problem or what will you recommend i check thanks
I bought one of this on ebay (used). I don't have a speaker to test it now. I plugged it in, The power indicator light turns on. I wonder if the fan should run too upon turning on the unit? Thank you in advance for response.
Hello! What i do is i use a light bulb in series in never blows up! And if i hear the relay going into protect i turn it off as quick as i can! Good luck!
Hi! I have a very similar amplifier that needs repair. Do you do outside work? Or work directly with anyone for an amp repair? I don't think I can do it myself. If so please let me know! Awesome video by the way.
In my server power supplies they are also really small transformers build in! For 650 Watts, they had so tiny heatsinks!! I send you later some pictures of it ;)
At 3:25 you see the HiPerFRED Epitaxial Diodes D72, D73, D84, D85 - these are for the positive and negative Hi-Rail's and can handle 30 Amp's at 400Volts. At 3:44 you see two of four Diodes D74, D75, D80, D81- these are for the positive and negative Mid-Rail's and can handle 15Amp's at 200Volts.
Hi, so interested in your video, if I may ask. I have one power amp of QSC which is 120v input and in my country we are on 230v . I wonder if the switched mode power supply of these amp's can be converted to take in 230v instead of 120v and avoid the use of step down transformer
Hi Otiesh. Depends on the model. Please refer to the operators manual, or check the service manual. I am not an QSC-expert. Thanks for your comment. You are welcome. Kind regards, Max
Generally they are bought in the voltage setting that will be used. Some pro audio gear has a switch adjacent to the fuse or power connector that will allow 230V to be used.
i'am from malaysia. i think i can't send to you. :-( can you just tell me wht i need to do.? i have 2 units with the same problem. my email : rosdik87@gmail.com
you are using the plyers on the first 2 scews at least wrong.If you turn the handle and plyers the other way and draging instead off pushing the handle off plyers,you will get lot more gripping foce on the screws.those plyers are constructed so if used the rigth way it grips automaticly much harder at the same time as you drag the handle if i remeber correct?like the video.innteresting.do some amp building and repair for some 30 years.always somthing new to learn about different types of amps:
Ok here’s the deal …I think…, The switch mode is on full all the time, operating like a traditional power supply, it has 5 V across it error amp at all times… The energy is stored in the caps like a traditional amp, for fast transient response, I thought pulse width modulation is how it would control current to the speakers but evidently it is not fast enough?but it is also could be why it blows the crap out of everything when it fails If I ever get this thing working I will test the over current shut down
I think we had exactly those amps at my high school for the auditorium. Blew the ass out of the rectifiers diodes on one (BR1 on yours) same exact failure! Overheated that section. Caps were good though (Nippon and CDE, but I didn't know that those were best of best at the time). I had to get out vice grips too! That's been a long time ago...might not have been same manufacturer but I'll be a monkeys uncle if it wasn't identical.
sanjay gadhave did you ever figure out what was wrong? My switch wasn’t working reliably for a few years so we always just left it on and unplugged the IEC cable when not in use. Then one day it would not power up.
I have had the same issue (@7:00) with those overtightened screws on the IGBT's.
Nice result with the channel lock pliers!
(1:54) - I love the way the background music goes up a few dB when Max says: "...speaker outputs...". Nice touch.
thank you :-)
Just found your channel, i love electronics troubleshooting, funny to see how others do the troubleshooting.
Please keep making videos.
Thanks a lot, subscribed.
Greatings from Denmark
Thank you! You are welcome!
Sir I have Qsc Amplifier Model DCA 3022 Both Red Light blinking Kindly if you have possible then help me about solution
Looks like an impact driver with a long bit might work.
Thank you for making this!
Have a few of these at work. Will clean the heatsinks for sure :)
massive heatsinks can t wait for the mailbag
:-)
Hi Clemens. Always happy to see your comments. Btw, your mailbag is coming soon.
i have two 3402's that have scouring on the same resistors, thanks for posting!!
You are welcome. Thank you!
You are so funny brother 🤣🤠
Thank you Jark
I just picked up a Peavey power amplifier.. Plugged it in.. It powered on for a second, made the lights in my house flicker, then blew the back fuse...
Would shorted transistors cause it to blow a fuse?!?
“Magic smoke” love it!
Sounds like a mini Arnold Schwarzzeneger (Sp?) when working on the rectifiers... lol.... good video!
from heeea!! :D
More like Dr. Strangelove lol
Hi good day I have a q.s.c plx3602 problems.... the problem is the relay clicking on for a few minutes and clicking of it comes on for a few minutes and of I don't know what causing that problem can you let me what can I do
Hey! I have a plx2402 that works alright but when I turn it off, one of the channels (just n2) creates a very loud pop. I connected the output of it to a scope and saw a very big spike at turn off. I have 167.5V at each rail of the power supply (measured across the big blue eletrolytics). Signal at normal operation is clean and both channels are matched. I would like to know your opinion on this. What should I suspect? Many thanks
Hi i am getting a problem with my QSC P LX 3402 no power but all the fuse is good and all the output transistor is good and all the regulator is good what you think could be the problem or what will you recommend i check thanks
I bought one of this on ebay (used). I don't have a speaker to test it now. I plugged it in, The power indicator light turns on. I wonder if the fan should run too upon turning on the unit? Thank you in advance for response.
Hello! What i do is i use a light bulb in series in never blows up! And if i hear the relay going into protect i turn it off as quick as i can! Good luck!
Thank you for your kind comment. Happy to see your thumbs up. You are welcome. Please check out my older videos.
hi max,,are you able to repair car amplifiers to..i have wery rare 3 amplifiers i would like to get serviced..are you interested
Ing. Max Koschuh zxv
xfjkd
Sir I have Qsc Amplifier Model DCA 3022 Both Red Light blinking Kindly if you have possible then help me about solution
Hi! I have a very similar amplifier that needs repair. Do you do outside work? Or work directly with anyone for an amp repair? I don't think I can do it myself. If so please let me know! Awesome video by the way.
Hi can u make video about it s power supply start up sequence
In my server power supplies they are also really small transformers build in! For 650 Watts, they had so tiny heatsinks!! I send you later some pictures of it ;)
Hi. Yeah, I've seen your mail, will check it out later. Very curious to see them.
Please let me know about RMX 2450 +15-15 is Missing checked most of the components
At 3:25 you see the HiPerFRED Epitaxial Diodes D72, D73, D84, D85 - these are for the positive and negative Hi-Rail's and can handle 30 Amp's at 400Volts.
At 3:44 you see two of four Diodes D74, D75, D80, D81- these are for the positive and negative Mid-Rail's and can handle 15Amp's at 200Volts.
Sir I have Qsc Amplifier Model DCA 3022 Both Red Light blinking Kindly if you have possible then help me about solution
Haha this was great! Awesome
Thank you! You are welcome!
How can i contact you i have a question and possibly a job/repair
My qsc plx2402 blow. Cannot repair at Malaysia due couldn't get those spare parts.😭😭
Hi, so interested in your video, if I may ask. I have one power amp of QSC which is 120v input and in my country we are on 230v . I wonder if the switched mode power supply of these amp's can be converted to take in 230v instead of 120v and avoid the use of step down transformer
Hi Otiesh. Depends on the model. Please refer to the operators manual, or check the service manual. I am not an QSC-expert. Thanks for your comment. You are welcome. Kind regards, Max
Please thanks , will keep searching for the solution
Generally they are bought in the voltage setting that will be used. Some pro audio gear has a switch adjacent to the fuse or power connector that will allow 230V to be used.
hi max, do you ever repair QSC PLD with auto shut down.?
auto shut down? sounds familiar to me.
where do you live? can you send it to me?
i'am from malaysia. i think i can't send to you. :-(
can you just tell me wht i need to do.? i have 2 units with the same problem.
my email : rosdik87@gmail.com
you are using the plyers on the first 2 scews at least wrong.If you turn the handle and plyers the other way and draging instead off pushing the handle off plyers,you will get lot more gripping foce on the screws.those plyers are constructed so if used the rigth way it grips automaticly much harder at the same time as you drag the handle if i remeber correct?like the video.innteresting.do some amp building and repair for some 30 years.always somthing new to learn about different types of amps:
Ok here’s the deal …I think…, The switch mode is on full all the time, operating like a traditional power supply, it has 5 V across it error amp at all times… The energy is stored in the caps like a traditional amp, for fast transient response, I thought pulse width modulation is how it would control current to the speakers but evidently it is not fast enough?but it is also could be why it blows the crap out of everything when it fails
If I ever get this thing working I will test the over current shut down
Hi, how many amprios is the original source?
I think we had exactly those amps at my high school for the auditorium. Blew the ass out of the rectifiers diodes on one (BR1 on yours) same exact failure! Overheated that section. Caps were good though (Nippon and CDE, but I didn't know that those were best of best at the time). I had to get out vice grips too! That's been a long time ago...might not have been same manufacturer but I'll be a monkeys uncle if it wasn't identical.
thank you for your awesome comment. Also, I've noticed that you gave me thumbs up, that's nice!!
what is number of ic?
I have one virgin state very clean looking I never fired it up it's for sale
7:21 "even though it has no shorts, but... I guess... yeah!"
Alright. Nice argument, I guess...
My nap was plx 3602 on/off not power on properly please help me
sanjay gadhave did you ever figure out what was wrong? My switch wasn’t working reliably for a few years so we always just left it on and unplugged the IEC cable when not in use. Then one day it would not power up.
A ratcheting right angle screw driver works well in these tight cases better than pliers. For what it’s worth. I
i have PLX2402 it's in stand by
Where is Part 2?
it is linked in description. you are welcome.
what a short screwdriver
heh heh heh :-)
1202 feet 3002 feet
power no hi end
c 131 looks domed an cooked
nao e hi end
Switching power supply....
SMD garbage.
Xhfmv
Power.200 wat