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- เผยแพร่เมื่อ 7 มี.ค. 2023
- Hi,
In this video I repair the PFC circuit on a Mackie SRM450v2.
Whilst editing the video, I had time to read the on screen firmware failure message. I had previously thought it was a normal boot message where one can change the language etc.
I have spent over £1000 on firmware upgrades so will be speaking to Keysight before attempting any firmware upgrade.
I need to thank you for this video, I've just repaired yet another one of these and I use this video to remind me. I can confirm the PFC in this unit starts at 95khz and drops to 66khz with the PSU.
Thank you for your comments. You'll find if you change the 2 caps around the pfc chip, the frequency will drop.
and that's exactly what I have done, presently on a long soak test before return@@JohnB-2021
@@michaelshaw1827 Excellent work!
Thank you.
@@JohnB-2021excellent work thankyou, it was actually 85khz, not 95khz.
Excellent job, and very clear. Thank you.
Thank you for your comment.
Thanks for taking the time to make this very informative video! I have an active speaker that has blown the 2 switching FETs and the mains fuse, so researching what else to test before I put in 2 new switching FETs to make sure something else hasn’t blown as well. All the best and take care!
Replace the driver too.
Thank you for your comments.
Thanks just seen your very intuitive video, I have the same problem with my SRM450 V2.
initially Q1 was defective i changed that. applied the 18v checked 95khz and the wave form similar to your trace. Applied mains voltage through a current limiter. Voltages fluctuated. will change the capacitors and IC U36 if required.
thanks again been working on this for weeks.
Thanks for sharing
Thank you for a very good and detailed troubleshooting analysis..👍👏
You are welcome!
Thank you for your comments.
Thankyou inspiring you made it look simple
supermarketsweeps Thank you kind sir.😁
Thank you very much for such a good tutorial. Right now I am repairing an electronic board. It is the same model but it is 120 VAC. I think this video will help me a lot. Greetings from Mexico.
Thank you for your comment and good evening from the UK 🇬🇧
Great video pfc and llc are one of pet likes
Thank you Steve Be.
Neat! Very informative.
Ps: BTW, they could have made everything much more compact if they'd opted for a stacked PCB arrangement. I wonder why they didn't...
Good point!
That's interesting. Not the first time someone has worked on something and not got it working before sending you way!
I think it did work for a while, not sure how long.
On this model the heat dispersion of transistors is not good the white plate between the transistor and the isolated back far too. And the diode and the transistors lose life, if the system is hard requested.
Thank you for your comments.
Sir...i have mackie srm 450v2 active speakers..when i power on it shows thermal and peak light lighting continuously...how to solve this problem.. Please tell me..
I should have waited even though the Mackey's don't sound as good as the Ev for it has a better lay-out then the EV speakers
Hello, was thinking you may be able to give an opinion on active PA speaker brands. I'm looking at mid-range (price wise) speakers, and they all seem to be made in China. With that being the case it wouldn't surprise me if they all shared many of the same components. It appears you have done intense surgery of many of these, is there a stand out in the crowd in which your not just paying for the name plate on the front? Thanks!
Thank you for your kind comments.
If I wanted to purchase an active speaker, it would have to be Yamaha.
Unfortunately, they are more expensive than many others.
However, they do offer something like a 7 year warranty.
They also release their schematics so repairing them is not a problem.
I believe they are also made in China but use high end components.
Have a look at the Yamaha DBR 10 I repaired.
Thank you.
Hello, I have two modules.
1. Resistors R243 and R245 are overheating.
It does not turn on at the first press from the On Off switch, if I turn it off and turn it back on while the lights go out, it works.
2. Sounds distorted at medium volume.
I would be glad if you help.
Sorry, I have no idea. It could be 100 different faults.
Hi just quick question. I see your oscilloscope probe your not using earth leas are you earthing another way cheers
The waveform gen output is the ground to the xlr
@@JohnB-2021 cheers just spotted that
Hello Sir
How to do Mackie srm v class 212 hard reset ?
I have never seen one so no clue.