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you did not set bias on vr166 and vr43 ??

good morning sir thanks to share vedio nice your explanation, ihave questions to my power amplifier qsc plx3002 done replace regulator and rgvt transistor and ir 0121, sg3525an and i check the power supply section is no shorted and the output transistor ic all okey no shorted the primary power supply turn on good supply but not secondary not comes supply sir , how to determine problem thanks

Hey hello just found your video, i have a similar problem my alto ts412 signal/limit light is constantally on and no audio signal is connceted to the speaker , i have tried turning it on and off but immediately its on the led signal light comes up. What should i do ?your response will be highly appreciated

is it normal that with the second click can cause the speaker to have a crackle at the start ?

I have the same issue and ty for the video. Where can I get these capacitors at

The real question is why does this happen? Happens on mine every couple of years.

Well, it's not worth getting junk IMO.

I don’t know much about electronics, but my better judgment tells me that this is really stupid. Yes, it will work… But at what cost?

Great video, thanks for posting 🤘🏽

I’m having the same issue. I replaced the O2 sensor for bank 1 sensor one and still getting an “open circuit” code. 2009 BMW 328xi coupe.

So glad you posted this

I need this gray part

K E W L .

Bom dia,estou com um amplificador desse pra conserto,está com o Viper torrado e o optacoplador Conseguiria me passar a numeração desses componentes?

Can you help? I have a bx8a with a 15 amp fuse. The problem is the power cables here in the UK are all 13 amp. Can I still use the 13amp cables without over heating? Unfortunately I no longer own the original cable that came with the speaker.

How did you get these pointer knobs? Edit: Oh nvm, CR20ldx has those.

Hi Clint, I have an active pa speaker, which I've repaired as a hobbyist. Although it now powers up and no longer blows fets, the tweeter runs for about a minute and then clicks and turns to a low volume hiss. Have you come across this issue at all, I've can't isolate what's causing it

Where do you buy replacements (for my djm s-11, which looks the same as yours).

What are the specs for all the replacement bulbs?

Hello again , I just retested it and found that channel 2 also has white noise but not as much

I have a loudbox performer 700bt with the same problem in channel 1 but i don't see a Q10 in it . Can you tell which component I need . Thanks , Mitch

Yep, many of these ended up like this and are pure junk/not worth repair :(

I have my sr .. they have power but they dont detect in my pc

Is there any room on top to put a on/off toggle switch to run power? I can't stand the one's on the back of amps much like Laney and Fenders.

You connect the 15v split supply .where is the pin for 3.5v?

Do you have a speaker (load) connected? And do you have the Master Volume all the way down?

Hello! I was interested in the design. I just want to understand, are the speakers completely closed in the box on the reverse side? QSC Ksub

хотелось бы увидеть полный разбор коробки..

any controller can break but they can last forever and never break if your not hulking and pulling it like a mad man it will not break on you

These speakers are for PA Microphones or Guitars, etc. passive inputs. They are not for inputs from active amps with large peak to peak voltages etc. The protection zener diodes and inductors are designed to protect the impedance matching circuit from active peak to peak inputs. Using wire links is madness... unless you are savvy and only use passive devices as above which these speakers are designed for. RS COMPONENTS supply replacement components. You need to understand this circuit as no schematic is avaliable. A bit of reverse engineering is required to work out which zeners and inductors to buy.

I know this is an old video. I can’t find help anywhere. My 1/4” Jack is totally busted. Anyone know the part number or could you just use anyone! My monitor is almost unusable. I have to use tie wire and duct tape to hold the cable just right. But it sounds terrible

But it’s a 1200! They’re the best! Lol, this is why I bought a plx1000. 1200s now a days are too expensive and we have no clue of their history

replace that 8 diodes with 12v zener diodes and coils is available

Hello please i have Alto SMX112A the sound very low, please i need your assistance on how i can fix this problem. Greatly appreciated .

THX for the Nerdporn 👍

So did it sound good?

Is the second click the activation of the outputs? For me the outputs are switching on with delay, normal?

can I bypass the head part and use the speakers as a speaker cement for a different amp head..? Any idea how to build a speaker unit by itself

❤️ "PromoSM"

Can someone tell me whats the R5 value is for orange crush 25bx main board?…I have the same problem with the capacitors but R5 was also damaged in the positive output to the horn.

Many of them have PC board damage due to the filter caps shorting and leaking and catching fire. And often times, the control hybrids are blown up (little boards standing up near the heatsink) and those are no longer available from QSC. If you want to support these amps...and they're great amps, to be sure...then buy up examples that have one bad channel and you'll always be able to use them as parts sources for others. Replace the capacitors with long life 105C types and there's no need to go with higher value caps than the originals. You don't need to boost voltage or capacitance ratings.

Volevo chiederti ma con due valvole funziona a 50 w?

Same issue but in Channel 1 (Top) which FET needs to be replaced for the top channel

These amps are junk!!! I've been a technician for over 40 years an a professional touring drummer!! We have 4 of these boat anchors!! I've had to repair 3 out of the 4 this last one I fixed the shorted channel ran great on a Variac at 110 volts ac!! But when I plugged in to main power it blew q96/97d78/79 an the 2 ten ohm surface mount resistors!! This is after i installed the power supply restoration kit!! The schematic I have has no voltages except for the 16 an 5 volt checks what's the best way to check this pile of crack to make sure it's safe to power up ??? I've got crown amps I've had for 20 years 0 trouble!! A pro amps should be able to handle the rigurs of touring etc!! I don't trust these!! Everything checks help!!!!

anyone else have this problem everything else checks fine!

I just replaced all the same parts on a plx 3602 it ran fine on my Variac but when I plugged it into straight power q96/97 exploded an r358/359 an d78/79 opened?? I'm a tech of 38 years experience

Yeah

Hello, I have a QSC K10 that powered on, the blue light comes on, but no input signal, green signal lights from both inputs don't come on. Can you help me out? can I send the input board to you for repair?

Hello. My loudbox mini's reverb is not working for mic channel. Do you have any Idea how to fix it?

Hola, mi parlante tenía roto una resistencia de 0.1 ohms, la remplaze y suena genial, solo tiene un inconveniente, y es que cada vez que lo enciendo emite un ruido, la primera vez al encenderlo después de un tiempo no hace ningún sonido, pero las veces siguientes lo hace, ya revise capacitores y todo está bien, no ce si sea problema de voltajes de algún regulador o los mismos transistores, pero cuando curse mecatronica en la escuela no aprendí mucho, fue más teoría que practica, y pues como ya no continué la universidad pues me quedé solo con algún conocimiento teórico, por último la llevé con un técnico en reparación y tampoco pudo hacer nada