Biema Alpha Line Array Repair : No Schematics and Someone Has Looked At This Before
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- Опубліковано 7 жов 2024
- 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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Thank you
Richard
*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
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.
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 !
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
I think your right and that wouldn't stop it working unless shorted ?
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
Mosfet....Mosfet....Mosfet..🤣🤣🤣🤣🤣
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
Look forward to the follow up
Great video Richard, I was wondering what model Fluke your using, Paul, USA.
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 !
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.
Well it won't confuse you now if you see one 😁
Try the Biema FW series schematics (the FW-2400 has chunks missing but may be close to what you have, or not).
That karaoke as BGM :D hehehe
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 😀
I would guess that it is either a 10 or 22 ohm resister !
That's my best guess too. Thanks David
Another long video that doesn’t have ending lols😂😂😂😂😂
True but it will have a sequal 🙂
@@LearnElectronicsRepair
SEQUEL not sequal EL at the end
as in EL TORO
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.
@@andrew_koala2974 oops 🤐
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.
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.
@@LearnElectronicsRepair Biema BF600: see RJ19. If it's connected like that, oscillation comes to mind
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.
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 ?
Do I understand correctly that at 54:00 you are saying that the speakers are driven in push pull like an old valve radio?
so it's a bridge mode amp by the sounds of it?
yep, as soon as u couldn't find the connection from the other speaker connection to ground i got it
Its going to be difficult as you cant test it without reinstalling back into the casement onsite.
Just use a load resistor on the output as a dummy load.
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...
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.
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
@@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. 👍
Very common for off-brand to have no info.
Often a Throwaway item as far as the maker is concerned...
And yet this comes from professional and no doubt expensive equipment.
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.
@@andrew_koala2974 What maker?
@@andrew_koala2974 Ergo it's the 10OHM resistor, sleep on it and see