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Search: Posts Made By: Per Hansson
Forum: General Electronics Technical Discussion Today, 08:54 AM
Replies: 27
Views: 279
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 Today, 06:41 AM
Replies: 27
Views: 279
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 Today, 04:37 AM
Replies: 34
Views: 392
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 Today, 04:19 AM
Replies: 27
Views: 279
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 Today, 03:34 AM
Replies: 27
Views: 279
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 Yesterday, 06:37 AM
Replies: 2
Views: 77
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 Yesterday, 02:31 AM
Replies: 4
Views: 159
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: 431
Views: 142,508
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: 85
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: 85
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: 431
Views: 142,508
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: 431
Views: 142,508
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: 431
Views: 142,508
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: 431
Views: 142,508
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: 431
Views: 142,508
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: 161
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: 431
Views: 142,508
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....
Forum: Troubleshooting Audio Equipment 08-07-2022, 04:40 PM
Replies: 431
Views: 142,508
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

Ok, lets try to test Q3, Q4 & Q5 in circuit starting with Q3 an NPN transistor:
With everything off and allowed time to discharge connect your meter in ohms mode, positive lead to the base of the...
Forum: Troubleshooting Audio Equipment 08-07-2022, 08:30 AM
Replies: 431
Views: 142,508
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

Ok, it sounds like your analog meter sources enough voltage to actually turn on the diode then from those readings, so it can be assumed to be correct.
Good that you tested the diodes with the light...
Forum: Troubleshooting Audio Equipment 08-06-2022, 08:44 AM
Replies: 431
Views: 142,508
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

Sounds fine!


Graetz Bridge is just a really bad Google translation from Polish (https://pl.wikipedia.org/wiki/Mostek_Graetza), it should say "diode bridge...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-06-2022, 05:08 AM
Replies: 17
Views: 508
Posted By Per Hansson
Re: ATX PSU SL-500 Short circuit can't find where? Transformer?

Ok, in these readings you no longer are close to a dead short on the primary winding so something in your testing must have changed?
For another example here is a new transformer I bought by mistake...
Forum: General Computer & Tech Discussion 08-06-2022, 12:19 AM
Replies: 17
Views: 360
Posted By Per Hansson
Re: laptop vs desktop rust spinner longevity

Not a study per se, more of anecdotal evidence:
But in industrial machines I service the Siemens PCU50 HMI PC is very popular.
It does feature a 2.5" HDD in a nice "free hanging" HDD cage.
I...
Forum: Troubleshooting Audio Equipment 08-05-2022, 02:21 PM
Replies: 431
Views: 142,508
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

Yes, most likely your R3 & R4 resistors where rated at 38K when new (orange, grey, orange, gold)
looking back through the thread I found many others report the same value.
I'll refer back to what I...
Forum: Troubleshooting Audio Equipment 08-05-2022, 09:49 AM
Replies: 431
Views: 142,508
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

c6 & c7 findings:
I have an analog multimeter (i know...so old school, but i have had it for many years, and electronics for me is limited!), so my measurements are approximate.
C6 measures...
Forum: Troubleshooting Computer Displays 08-05-2022, 03:59 AM
Replies: 4
Views: 159
Posted By Per Hansson
Re: Acer X223HQ (Version Bbd) on/off-power-cycling

The "unknown power IC" is the IC802 on the back of the PCB, an NCP1337 PWM Controller or the Power FET it is driving: Q804 an AP2761i N-Channel power MOSFET.
Your missing components are for an...
Showing results 1 to 25 of 500

 
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