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Biema Alpha Line Array Repair : No Schematics and Someone Has Looked At This Before

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A Customer brought this amplifier module from a Biema Alpha Line Array and says it is a very urgent repair, I've never looked at one of these before but I have a nasty suspicion that someone else has...
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Опубликовано:

2 июл 2024

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Комментарии : 43

@LearnElectronicsRepair Месяц назад

*Thanks to a subscriber I was emailed this link to Elektrotanya and downloaded all the schematics but unfortunately none of them match the amplifier I am trying to repair. Mainly these are class A/B amplifiers where as mine is class G. If anyone wants some Biema schematics (free) here is the link* elektrotanya.com/showresult?what=BIEMA&kategoria=All&kat2=All

@chillidogkev Месяц назад

Watching and listening to Richard as he analyses, disects, discovers and understands the problem he is dealing with is absolutely top notch. His style and delivery of the content is outstanding and it's what puts him at the top of the pile for this type of video in my opinion 10/10.

@davidroth4514 Месяц назад

Looks like a class G or H. To me . Might be in bridge configuration as well ! I have been watching and enjoying for some years now ! Thank you for sharing your work and knowledge with us !

@electronicengineer Месяц назад

The burnt resistor looks like it is working together with the capacitor next to it as a Zoebel network. The other channel has the same resistor with capacitor Zoebel network, and you can just read the bands on the non-burnt resistor. Fred

@andymouse Месяц назад

I think your right and that wouldn't stop it working unless shorted ?

@andrew_koala2974 Месяц назад

The non-burnt resistor would be described as ' intact ' Invest in a DICTION-ary and look up the meaning of the word > intact < and increase your vocabulary in the process. Read more to improve your knowledge of the English language. Good luck and good bye

@Lightrunner. Месяц назад

Mosfet....Mosfet....Mosfet..🤣🤣🤣🤣🤣

@matthewseymour5165 Месяц назад

Look forward to the follow up

@Dutch_off_grid_homesteading Месяц назад

Heya, yes that is a issue wen you don't have schematics and the color code is burnt. but the way you measer the resister could be good

@sastromo Месяц назад

That karaoke as BGM :D hehehe

@pauldery7875 Месяц назад

Great video Richard, I was wondering what model Fluke your using, Paul, USA.

@justmc62 Месяц назад

Wow.. That PowerCon connection would definitely confuse me for a SpeakOn connector. Guess I'm not as versed with equipment outside of North America. Thanks for sharing your knowledge as always !

@radioflyer2030 Месяц назад

VERY common connector on arena / stadium / festival / tour grade sound equipment **IN** North America, and all over the world. Also super common on DMX stage lighting because of the daisy chain feature. Great, unless the locking tab gets ripped off by brutal stage hands. Then they are worse than useless. Luckily, they are rarely molded on to the cable like IEC-C13 are, so field replaceable with a screwdriver.

@LearnElectronicsRepair Месяц назад

Well it won't confuse you now if you see one 😁

@andrew_koala2974 Месяц назад

CORRECTED EDITED FORMATTED TEXT ; A Customer brought this amplifier module from a BIEMA ALPHA ; Line Array and says it is a very urgent repair - ; I never looked at one of these before and I suspect that ; someone else has...

@ralphj4012 Месяц назад

Try the Biema FW series schematics (the FW-2400 has chunks missing but may be close to what you have, or not).

@warwickbunn1250 Месяц назад

As you have the add or web page for the actual item, are there any contact details for the manufacturer, so you could ask if they can provide a schematic ? Although you seem to be getting to grips with it now. Good effort. Looking forward to the next installment 😀

@k3ggaming926 Месяц назад

Another long video that doesn’t have ending lols😂😂😂😂😂

@LearnElectronicsRepair Месяц назад

True but it will have a sequal 🙂

@andrew_koala2974 Месяц назад

@@LearnElectronicsRepair SEQUEL not sequal EL at the end as in EL TORO

@andrew_koala2974 Месяц назад

Every video - every life and every thing has an ending Make sure you learn that. What is of note here is that there is no remedy at the present time - and it will take more time and a deeper investigation to discover a solution to the problem. So be grateful that there will be a sequel to this video - which I expect will provide knowledge and training to many viewers who wish to learn fault diagnosis and repair techniques LOL > Lots of Love Know also that criticism with good intention has value and any criticism SHOULD also provide a solution in the response.

@LearnElectronicsRepair Месяц назад

@@andrew_koala2974 oops 🤐

@davidhollfelder9940 Месяц назад

You probably want to visit this customer, and make a list/inventory of his equipment, so you can be better prepared for his repair jobs.

@andrew_koala2974 Месяц назад

You are incorrect Visiting any customer to make a list/inventory of their equipment is improper. Such a procedure would be invasive. Have you not leaned any morals in your short life ?

@Daniel-OConnell Месяц назад

Do I understand correctly that at 54:00 you are saying that the speakers are driven in push pull like an old valve radio?

@davidroth4514 Месяц назад

I would guess that it is either a 10 or 22 ohm resister !

@LearnElectronicsRepair Месяц назад

That's my best guess too. Thanks David

@thulinp Месяц назад

If the resistor is in parallel with that coil, it's sure to be 10 ohm like the other one, and also: a probable cause for it burning: bad solder connection on the coil. See elektrotanya Biema BF600. This has a single 10ohm in paralell with a coil on the output.

@LearnElectronicsRepair Месяц назад

The two intact 10 ohm resistors are in parallel with the coils. The burnt one is not. From the results when I tried to test it I think it is likely to be somewhere in the range of 15-22 ohms but it is just an inspired guess. I'm also concerned why it would burn up if it is in series with a capacitor which looks to be the case, unless it also goes somewhere on the other side of the board which is hard to get to.

@thulinp Месяц назад

@@LearnElectronicsRepair Biema BF600: see RJ19. If it's connected like that, oscillation comes to mind

@maebeans Месяц назад

so it's a bridge mode amp by the sounds of it?

@maebeans Месяц назад

yep, as soon as u couldn't find the connection from the other speaker connection to ground i got it

@photohounds Месяц назад

Very common for off-brand to have no info. Often a Throwaway item as far as the maker is concerned...

@LearnElectronicsRepair Месяц назад

And yet this comes from professional and no doubt expensive equipment.

@andrew_koala2974 Месяц назад

Of course your 'maker' made YOU as a Throwaway item. At some point in the not too distant future - a hole will be dug and your BODY placed in it for eternity - you will be consumed by the earth - whether you like it or not. Sleep - teaches you - not to be afraid of that time As one sleeps any thought of ' Tomorrow' and any future cease to exist. Sleep is a rehearsal for DEATH After so many rehearsals DEATH will be perfected and successfully achieved. Whatever failures one has had in life - success is at the end.

@LearnElectronicsRepair Месяц назад

@@andrew_koala2974 What maker?

@dcocz3908 Месяц назад

@@andrew_koala2974 Ergo it's the 10OHM resistor, sleep on it and see

@Arachnoid_of_the_underverse Месяц назад

Its going to be difficult as you cant test it without reinstalling back into the casement onsite.

@RTBNL Месяц назад

Just use a load resistor on the output as a dummy load.

@Manticore1960 Месяц назад

I can't get my head around the readings of that ctu 36s double diode. You measured it more than once in the video while it was in circuit & it definitely read O/C. There is nothing on the board that can make a component read O/C while on the board, yet read normally when desoldered. Makes no sense at all. btw...the double diode on the other side of the board is also soldered onto extension wires.

@LearnElectronicsRepair Месяц назад

Broken solder joint to the center extension wire. When I measured it in circuit I didn't probe the device legs just the soldered area

@Manticore1960 Месяц назад

@@LearnElectronicsRepair It looked like it had masses of solder on the centre pin though. That's what confused me. But your explaination is the only logical reason. 👍