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Search: Posts Made By: Per Hansson
Forum: General Computer & Tech Discussion Today, 12:46 PM
Replies: 8
Views: 198
Posted By Per Hansson
Re: Looking to buy a new laptop computer for doing 3D drawing software for a 3D print

Have you tried to install the official Lenovo sound drivers?
I made a clean install on mine when it was brand new (an older model than yours) and it always sounded like shit.
Then for some reason I...
Forum: Troubleshooting Audio Equipment Today, 10:48 AM
Replies: 440
Views: 142,936
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

Yea there must be something odd with the Behringer to cause that.
I guess you could try e-mailing or calling them to see if they have any ideas.
Forum: Troubleshooting Audio Equipment Today, 08:21 AM
Replies: 440
Views: 142,936
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

The voltages you should have on C8 and purple to green you can measure when the Behringer is not connected...
But to get a pretty good idea you can look at the picture in this sticker ;)...
Forum: Troubleshooting TVs and Video Sources Yesterday, 01:47 PM
Replies: 16
Views: 1,121
Posted By Per Hansson
Re: Phillips 50PF7321D/37 Plasma slow reboot

The likely component would be a capacitor, but it can be any component really, or even a solder joint.
You might be able to narrow it down further by doing more localized heating of components and...
Forum: General Electronics Technical Discussion Yesterday, 09:40 AM
Replies: 11
Views: 157
Posted By Per Hansson
Re: Old analog Power Supply needs your advice

The transformer is missing.
Forum: Troubleshooting Audio Equipment Yesterday, 09:37 AM
Replies: 440
Views: 142,936
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

Ok, no I have no idea why that might be, it does seem very strange!
If you want to trouble shoot it further you could measure the voltage across C8 when it happens.
Or perhaps better: the output...
Forum: General Electronics Technical Discussion Yesterday, 08:03 AM
Replies: 31
Views: 389
Posted By Per Hansson
Re: Help me with capacitors replacement

I don't know where you got "grooves" from, I said traces.
You need to remove the traces according to the picture in my post.
Otherwise the clearance is too small and it will just arc over again....
Forum: Troubleshooting Audio Equipment Yesterday, 07:53 AM
Replies: 440
Views: 142,936
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

Does the Behringer work with any other speakers?
And does the same thing happen with both speakers or only one of them?
If only one of them, is it the same speaker as you mentioned in this quote:
Forum: General Electronics Technical Discussion 08-14-2022, 08:54 AM
Replies: 31
Views: 389
Posted By Per Hansson
Re: Help me with capacitors replacement

Yes sure, I'd pick the one with the longer legs, just because I could not find a datasheet for the other one.
Forum: General Electronics Technical Discussion 08-14-2022, 06:41 AM
Replies: 31
Views: 389
Posted By Per Hansson
Re: Help me with capacitors replacement

It does not matter, the original is only rated for 2A so it should be more than that.
But any bridge rectifier you have in that large package I showed is going to be rated for more than that...
I...
Forum: Troubleshooting & Designing Networks 08-14-2022, 04:37 AM
Replies: 41
Views: 577
Posted By Per Hansson
Re: broadband ut300r2u modem,link light stays on forever

Post the output you do get in PuTTY with CODE tags, maybe something can be understood from it.

https://www.badcaps.net/forum/attachment.php?attachmentid=271152&stc=1&d=1660473423
Forum: General Electronics Technical Discussion 08-14-2022, 04:19 AM
Replies: 31
Views: 389
Posted By Per Hansson
Re: Help me with capacitors replacement

Just noticed your board is unmarked but the one linked by petehall347 in reply #3 has markings on it.
The board is apparently for the wire feeder motor in the welder, and from what others wrote on...
Forum: General Electronics Technical Discussion 08-14-2022, 03:34 AM
Replies: 31
Views: 389
Posted By Per Hansson
Re: Help me with capacitors replacement

Check the attached photo, the clearance is a joke!
I would put a regular bridge rectifier like I have shown if there is room for it.
Then remove the traces so the clearance between them is more...
Forum: General Computer & Tech Discussion 08-13-2022, 06:37 AM
Replies: 2
Views: 98
Posted By Per Hansson
Re: win7 bs

Usually it it because of both missing certificates and possibly the SHA2 compatibility updates for Windows Update, required since around 2020 some time.
You can install the updates under...
Forum: Troubleshooting Computer Displays 08-13-2022, 02:31 AM
Replies: 4
Views: 182
Posted By Per Hansson
Re: Acer X223HQ (Version Bbd) on/off-power-cycling

The 8-pin connector between PSU and Main PCB and any large / heavy components like transformers big capacitors etc
Forum: Troubleshooting Audio Equipment 08-10-2022, 11:29 AM
Replies: 440
Views: 142,936
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

Great! :)


No this capacitor is not as important, based on its location in the schematic it is there to provide an initial change in the base voltage to transistor Q7, changing the feedback...
Forum: Troubleshooting Audio Equipment 08-09-2022, 12:23 PM
Replies: 3
Views: 93
Posted By Per Hansson
Re: JBL PB12 Won't Turn On

It's brown-red-red-gold, it has just been heated up so much that the color bands got burned up... You can make a sanity check with a multimeter: it may still measure ok.

The reason I know this is...
Forum: Troubleshooting Audio Equipment 08-09-2022, 02:38 AM
Replies: 3
Views: 93
Posted By Per Hansson
Re: JBL PB12 Won't Turn On

I don't think the board is cracked, it looks like the PCB has carbonized, the voltage found a new path to travel...
Usually when you have this type of damage there will be more parts destroyed.
So...
Forum: Troubleshooting Audio Equipment 08-09-2022, 02:22 AM
Replies: 440
Views: 142,936
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

Famous words:

In the voice of Homer Simpson: Doh!


Do you mean it measures correctly in the other unit?
I would expect that Q7, RT2, R17 and C35 skews the results.
You can try to reverse the...
Forum: Troubleshooting Audio Equipment 08-08-2022, 02:46 PM
Replies: 440
Views: 142,936
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

Pretty much enough time has passed now that there should not be any charge in your gate left since your last test, so just check it with the ohm meter now like you did before.
But leaving the gate...
Forum: Troubleshooting Audio Equipment 08-08-2022, 12:47 PM
Replies: 440
Views: 142,936
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

Wow, I must say everything seems to work really well!
Just one thing: with the MOSFETs now out of circuit redoing the test do you have infinite resistance if you ground the gate?

You could do the...
Forum: Troubleshooting Audio Equipment 08-08-2022, 10:36 AM
Replies: 440
Views: 142,936
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

Not really, you could take some measurements, for example ohm out VCC pin 7 to GND pin 5 and then compare to your working unit.
In fact you could ohm out all pins in relation to ground and compare...
Forum: Troubleshooting Audio Equipment 08-08-2022, 08:31 AM
Replies: 440
Views: 142,936
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

This could be pointing in the direction that the UC3844N is what is bad, I'm really not sure though...


Q5 is not NPN but a PNP transistor, can you please just double-check this, as with the info...
Forum: Troubleshooting & Designing Networks 08-08-2022, 06:24 AM
Replies: 3
Views: 180
Posted By Per Hansson
Re: Windows 2016 server L2TP/IPsec VPN - two subnets

Thanks for coming back, just out of curiosity did you figure out exactly why it happens?
It does on my workstation laptop, occasionally it will get a wrong IPv6 DNS server entry.
But I'm not sure...
Forum: Troubleshooting Audio Equipment 08-08-2022, 12:08 AM
Replies: 440
Views: 142,936
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

Q3/Q4 results: Their bases are connected together, so equal results are expected.
Q6 results: This transistor has a 100ohm resistor (RT2) between base and emitter so this result could be normal....
Showing results 1 to 25 of 500

 
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