Monitor Audio BXW10

[MattM]

Re: Monitor Audio BXW10

From other things I have read it may be worth contacting monitor audio for the schematic

[amaral]

Re: Monitor Audio BXW10

Dear
Also I could not locate the service manual, Monitor Audio is difficult.
Follows output class D sub.
It uses IRS2092 (IC108). Check that the Q102 and Q102 fets are good.
The IC109 is a microcontroller, which makes the protect and standby
Without the fets the circuit works and can measure the voltages. After a while comes protection.

[amaral]

Re: Monitor Audio BXW10

The IRS2092S from my SUB was also damaged.
To test the entire preamp part, remove the IRS209 and the FETs, enter a signal on the LINE INPUT and turn on the SUB. Check with the oscilloscope if the signal is present on the R150 which is the IRS input. Do not forget to increase the volume in the POT.
After exchanging the FETs and the IRS in mine, everything was fine.

[momaka]

Re: Monitor Audio BXW10

Thanks for follow up, amaral.

So from your description, it looks like once the PSU goes bad, the IRS209 IC and FETs may also need to be replaced to get the unit operational (that is, if there is no sound after the PSU is repaired).

[shoomax]

Re: Monitor Audio BXW10

~ ~ = approx. 5 M ohm
- + = 134 K ohm
Leftmost switching transistor:
pin 1 + pin 2 = 2.0 M ohm
pin 2 + pin 3 = 400 k ohm
pin 1 + pin 3 = 2.0 M ohm

Right switching transistor:
pin 1 + pin 2 = 02.5 ohm
pin 2 + pin 3 = 0.005 ohm
pin 1 + pin 3 = 02.45 ohm

I am struggling to locate U209 please can you give me a pointer.

Thanks once again

U209 - the name is erased, but it looks like ISL6744A. P18n50C and 1500x80v capacitor were punched. After replacement also does not start. Service manuals in Russia is also not.

[shoomax]

Re: Monitor Audio BXW10

P18n50C I ordered for aliexpress I suspect that the Chinese have sent bad ones. The rest of the details around the P18n50C seem to be working. I tend to install an additional power supply. It is more expensive to buy an audio monitor from a monitor than to buy a new BXW-10

[makidoja]

Re: Monitor Audio BXW10

Hi all, I have BXW10 that powers up, red light on back but there is no operation .. I've taken the amp / psu board out and can see a small electrolytic cap with diode next to it and a small 4 pin device in front, the cap has some blackening along with the board which looks to have come from a failure of the 4 leg device .. does anyone have a circuit diagram or know what the device is? Should i replace the electrolytics, 4 leg devices diodes and the big smoothing caps and see what happens?
Anyone know what the voltages on the cable colours sulks be?

Mak

[momaka]

Re: Monitor Audio BXW10

Hi all, I have BXW10 that powers up, red light on back but there is no operation .. I've taken the amp / psu board out and can see a small electrolytic cap with diode next to it and a small 4 pin device in front, the cap has some blackening along with the board which looks to have come from a failure of the 4 leg device ..

Could you post a picture of the affected area / parts. Without the part designators mentioned and no pictures, it's hard to determine which part of your circuit is faulty and what needs checking.

does anyone have a circuit diagram or know what the device is?

So far, no one has been able to find one. But last time I checked it was more than half a year ago. Unlikely that anyone has uploaded one or made one, though.

Should i replace the electrolytics, 4 leg devices diodes and the big smoothing caps and see what happens?

You can.
But the question is why did these parts blow? Chances are, there may be something else upstream or downstream of these parts (or the power supply itself) that made them go bad. So without checking first, you may end up with the same parts blowing again.

Anyone know what the voltages on the cable colours sulks be?

You can see a few of the voltages labeled near the white connectors on this picture:
https://www.badcaps.net/forum/attach...6&d=1545163047

[Wussman]

Re: Monitor Audio BXW10

Hello everyone!
I have a problem with my BXW-10 psu, two components on the backside of the pcb, Q914 and D927, are missing.
Could someone please, tell me the part number of those two components?
Thank you!

[dobrykamil]

Re: Monitor Audio BXW10

hello everyone!
I have a problem with my bxw-10 psu, two components on the backside of the pcb, q914 and d927, are missing.
Could someone please, tell me the part number of those two components?
Thank you!

Q914 - bcx56-16
D927 - bas321

[Wussman]

Re: Monitor Audio BXW10

Q914 - bcx56-16
D927 - bas321

Hello, thank you very much!

[Hemds]

Re: Monitor Audio BXW10

Hey there,

I also got my BXW10 damaged. As I couldn't find the schemematics, I started to look into forums in order to find out any help.

So, at first, the sub was completely dead. After some initial research, I decided replace a voltage supressor and the switcher to solve it
- 1 P6KE200A
- 1 TNY274PN

After that it, when I tried to power it on, the power led blinked sometimes and goes to red. No sound at that time. It seems like a protection prevention, or something like that.
Then, I replaced the output IC and its FETs
- 1 IRS2092 (IC108)
- 2 FDP61N20 (Q102 and Q103)

Now everything works fine.

I hope it can help someone.

[coronah]

Re: Monitor Audio BXW10

So. My Sub powers on and green indicator light comes up in ON or AUTO position for switch, then after while red would light up and it would stay red? All this with no sound.

Does this sound like any of the situations you had guys?

[Kidherdhulkarnai]

Re: Monitor Audio BXW10

any one tell me bronze bxw-10 c951 capacitor

[warick_wrx]

Re: Monitor Audio BXW10

any one tell me bronze bxw-10 c951 capacitor

I know it's been a while, the value is 47uF @ 50V

[warick_wrx]

I have one of these amplifier modules, as some of the user's have mentioned before the fault that I experience is that the unit switches on. The green led and then after a few seconds it goes into standby mode red (protection) mode. I have started to analyze the circuit as I have sourced the circuit diagram. Will update once I find something.

[warick_wrx]

Here are the schematics if anyone is intrested.

[warick_wrx]

I have some feedback regarding a second BXW-10 module which also has a fault but different to the other. When the unit is switched on it makes a popping noise, furthermore if left in auto mode the unit switches on itself and then the popping noise follows. It looks like I managed to sort this out by replacing the two main Q103 and Q102 FET's.

[warick_wrx]

Managed to source another faulty board. This one keeps blowing the fuse when the main ac circuit in switched in. After some fault finding I found one of the 8mH mains filter double wound inductors L902 had failed. Not sure what might have caused this. Secondly I have not managed to find the exact origional part online, so might have hade to use an equivalent replacent. For now I swapped the faulty filter inductor out with the one from the other spare board I had and now its working 100%. That was an easy fix !

[BenDwire]

I've just managed to repair my BXW-10 by replacing just one capacitor! C149 (22uF) was showing signs of leakage around its pins. There was a small amount of grey residue on the top of the PCB, but at first I didn't think it was that significant. I decided to change the output FETs as the most likely cause (and what a hassle that was - you need a right angle screwdriver) but the originals actually tested OK. C149 was then changed as the voltage rating of the fitted component was only 25V, which is incorrect according to the circuit diagram. I put in a Panasonic FR 50V cap and all was well.

For reference, the fault on my subwoofer started off with a whooshing sound on power-on, which then stopped after a few seconds. This carried on for a few weeks, and then the speaker completely stopped producing any sound at all, although the power light was still green.

Thanks to other forum members for their posts, and especially warick_wrx for the circuit diagrams.