QSC Power Amplifier PLX3402 Amp Repair (Part 1) BEB #27

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This tutorial is also valid for the model PLX1202, PLX1602, PLX2402 and PLX3002, as they are all based on the same circuit board. Parts of this tutorial, somehow, also apply to PA amps from other manufacturers, like: Crest, Crown, Behringer, EV, Dynacord, Yamaha, LAB Gruppen, Powersoft, dB Technologies. The mechanical construction is often the same, and so are the problems.
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Welcome to the Beautiful-Electronics-Blog, BEB.
Free teardown videos and education. No ads for my subscribers who watch within 48 hours after video has been released.
In this episode I will show you all the different sections of a QSC PLX series power amplifier. Let's repair this thing.
The QSC PLX3402 is a rackmount public address amplifier. 2U. Analog amp, with switch mode power supply. IGBT's in chopper section. XLR inputs. Speaker output on 4mm binding posts and Neutrik Speakon connectors.
Follow up:
BEB #44: PSU successfully repaired:
• QSC Power Amplifier PL...
German: Heute repariere ich eine PA-Endstufe von QSC (1.Teil, leider alles auf englisch). Das Teil hat ein Schaltnetzteil, und eine konventionelle Push-Pull-Endstufe. Im ersten Teil finde ich die wichtigsten Fehler (IGBT, Brückengleichrichter). Im nächsten Teil werde ich versuchen das Gerät zu reparieren. Das kann ich tun sobald die neuen Teile bei mir eingetroffen sind.

Опубликовано:

11 сен 2024

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Комментарии : 70

@Bodragon 7 лет назад

(1:54) - I love the way the background music goes up a few dB when Max says: "...speaker outputs...". Nice touch.

@MaxKoschuh 7 лет назад

thank you :-)

@eirikolsnes 5 лет назад

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 :)

@MAYERMAKES 8 лет назад

massive heatsinks can t wait for the mailbag

@MaxKoschuh 8 лет назад

:-) Hi Clemens. Always happy to see your comments. Btw, your mailbag is coming soon.

@praestant8 6 лет назад

“Magic smoke” love it!

@onewayrecordsTV 5 лет назад

i have two 3402's that have scouring on the same resistors, thanks for posting!!

@MaxKoschuh 5 лет назад

You are welcome. Thank you!

@mortenrolsing7137 7 лет назад

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

@MaxKoschuh 7 лет назад

Thank you! You are welcome!

@NadeemKhan-vy1wu 3 года назад

Sir I have Qsc Amplifier Model DCA 3022 Both Red Light blinking Kindly if you have possible then help me about solution

@jh98231 7 лет назад

Sounds like a mini Arnold Schwarzzeneger (Sp?) when working on the rectifiers... lol.... good video!

@aman-mn5kc 7 лет назад

from heeea!! :D

@anon7039 6 лет назад

More like Dr. Strangelove lol

@jarkmaruf 3 года назад

You are so funny brother 🤣🤠

@MaxKoschuh 3 года назад

Thank you Jark

@maxischerr 8 лет назад

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 ;)

@MaxKoschuh 8 лет назад

Hi. Yeah, I've seen your mail, will check it out later. Very curious to see them.

@MaxKoschuh 7 лет назад

Thank you for your kind comment. Happy to see your thumbs up. You are welcome. Please check out my older videos.

@08halit 7 лет назад

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

@edsonrosy.com.br.edsonrosy4495 6 лет назад

Ing. Max Koschuh zxv

@edsonrosy.com.br.edsonrosy4495 6 лет назад

xfjkd

@mariusbaban6738 4 года назад

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!

@djblackarrow 6 лет назад

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.

@NadeemKhan-vy1wu 3 года назад

Sir I have Qsc Amplifier Model DCA 3022 Both Red Light blinking Kindly if you have possible then help me about solution

@RGD-Audio-Repairs 2 года назад

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?!?

@rajeshramcharan2536 3 года назад

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

@johnramsawak6407 2 года назад

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

@ronnelguiriba6246 4 года назад

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.

@barbasbandas6665 3 года назад

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

@WolFv38 3 года назад

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.

@r.kelectronics6164 3 года назад

Hi can u make video about it s power supply start up sequence

@WubWubLuv 8 лет назад

Haha this was great! Awesome

@MaxKoschuh 8 лет назад

Thank you! You are welcome!

@OverKillPlusOne 7 лет назад

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.

@MaxKoschuh 7 лет назад

thank you for your awesome comment. Also, I've noticed that you gave me thumbs up, that's nice!!

@AZTEKBOY12 2 года назад

How can i contact you i have a question and possibly a job/repair

@leohobbleohobb3781 6 лет назад

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:

@garydiamond6078 6 лет назад

I have one virgin state very clean looking I never fired it up it's for sale

@kansasnutt Год назад

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

@NadeemKhan-vy1wu 3 года назад

Sir I have Qsc Amplifier Model DCA 3022 Both Red Light blinking Kindly if you have possible then help me about solution

@MuhammadArif-lh7oh 4 года назад

Please let me know about RMX 2450 +15-15 is Missing checked most of the components

@droy360 2 года назад

My qsc plx2402 blow. Cannot repair at Malaysia due couldn't get those spare parts.😭😭

@Otiesh 7 лет назад

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

@MaxKoschuh 7 лет назад

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

@Otiesh 7 лет назад

Please thanks , will keep searching for the solution

@andrewhigdon8346 4 года назад

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.

@rexelcatamin1939 Год назад

what is number of ic?

@praestant8 6 лет назад

A ratcheting right angle screw driver works well in these tight cases better than pliers. For what it’s worth. I

@arielocervantes4784 6 лет назад

Hi, how many amprios is the original source?

@adibashservice3865 7 лет назад

hi max, do you ever repair QSC PLD with auto shut down.?

@MaxKoschuh 7 лет назад

auto shut down? sounds familiar to me. where do you live? can you send it to me?

@adibashservice3865 7 лет назад

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

@mattmoreira210 4 года назад

7:21 "even though it has no shorts, but... I guess... yeah!" Alright. Nice argument, I guess...

@rafaelmendozamolina6870 4 года назад

i have PLX2402 it's in stand by

@sanjaygadhave2928 5 лет назад

My nap was plx 3602 on/off not power on properly please help me

@andrewhigdon8346 4 года назад

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.