#67 - Mackie PPM1008 powered mixer repair
Vložit
- čas přidán 16. 10. 2018
- According to the previous owner, this mixer was diagnosed in a local repair shop as having a power supply failure. I was told that the repair estimate was $500, so the mixer ended up being sold for $50 for parts or repair. I could not resist the temptation. The failure was traced to one 100V 3A schottky diode, which is $0.52 on Digikey. Wonderful mixer for a wonderful price!
- Věda a technologie
$50 bucks and .50$ cents and a little know how makes for a great repair. *Thumbs* *Up* *Cheers*
I was given a dead Mackie ppm608, and after following your instructions I too heard the clicking relays! Thanks so much for posting this video, it saved an $800 unit from the scrapyard!!! best regards, niels nielsen
More and more repair shops have become glorified board changers, in all kinds of fields. The big win is another video from you.
Impressive quick repair on your part! I noticed that your knowledge of the equipment was, of course, the key.
You're a great narrator! I really appreciate your videos.
The corporate repair model has been board swap for 40 years now, only hobbyist and old school techs will tackle component level repairs. Stunning as the rewards vs. cost is often substantial. I do the same, fix old stuff to make it like new. Tube radios, old oscilloscopes and lots of stuff. I love your channel. Great video as always.
Very good job and narration. Another piece of gear saved from the scrap pile with some know how. Love it. Thanks.
Nice job. Nice deal! Thanks for sharing. Love your videos.
Welcome back :-) Great as always. Please keep it up specially with more test gear ;-)
Great repair! I love the repairs on pro audio equipment.
Thumbs up.... thank you for showing the tear down of this unit. Helpful for my repair! :)
Cool, good to see another video from you.
Nice and simple repair!
I got a Mackie unpowered mixer board that was quite valuable. The switch mode power supply had MANY failed components. I was able to buy the power supply unit for 70$ including shipping. For a 700$ mixer board, the customer was happy with that.
What a great result !
A satisying repair.......always the best ones.
I picked up a dead Phonics powered mixer vaguely similar to your Mackie for about 20UKP. It turned out to be in worse shape, unfortunately! Both switching mosfets shorted, gate driver IC blown and also the PWM IC! I decided it was worth repairing and spent the money on the parts, which was about what the mixer cost! It works perfectly, so it was worth the gamble. I can understand any tech not wanting to touch these things, though. It can get expensive if the replacement parts blow up immediately! The domino effect on these big SMPSs can cause costly damage, taking out parts you could miss the first time around.
Thats wha I call... a Win, nice one, thanks for sharing....
My 808 Mackie Mixer just crapped the bed. I turned it on and I saw the lights go up and down and heard a fizzing noise and it died. I hope it can be repaired and at a reasonable price. I know it is hard to get parts for electronic equipment these days.
saludos desde Mexico gracias por tan excelente explicación
Great video.. I have a Mackie 808m with the inbuilt twin amps, One for main speakers and a separate amp for the monitors.Probably a daft question but could I run one channel from the mains amp and one channel from the monitor amp to increase the volume? Thank you
I'm another one who has experienced the PSU dying with the same symptoms. It looks like this is a common issue on these models. 100V 3A Schottky diodes are cheap and easy to get so it isn't the end of the world as long as nothing else gets stressed during the fault. One worrying aspect is that the caps the diodes are working with are only 470uF/25V types which are standing up to the voltage fine. Why is a 100V diode failing?
The reason some shops won't touch these may well be the SMD construction. Despite what some say working on SMD manually is not a given piece of cake. You need a fine iron - and access really helps! Though it isn't essential, I would actually recommend removing the first line of caps to the side of the diodes to ensure plenty of room to work around. These are through hole and are easy to remove and refit if you have a sucker and your soldering skills are good.
Thanks, great video, I hope it will help me fix a ppm608 that i have a chance to buy cheaply.
It has a power fault i think(lights flashing on and off).
Any tips on what to look out for would be very helpful.
Thanks again. Mike.
Great. Very interesting.
Great video, thanks for posting - I have a PPM608 that died on me last night... It has the same problem (different diode D23 instead of D24). I have just ordered some SS310's. Did the Mackie stay ok after a longer period of use?
I have a MACKIE ppm608 first the left channels started loosing sound could barely hear the left along with static, two months later no sound at all any channel. But you can see signals working on the led lights as it were working led lights moving up and down when talking on mics but no sounds coming out from any channel, do you think you can help? Its used in a church
I have the same power mixer. My power up but not getting any sound from the outputs. Does that mean the problem would probably coming from power amplifier? And my other question is can I still use this as a regular mixer? And use external power amplifier. Do I have to unhook the internal power amplifier in order for this to work? Thank you in advance
Awesome! What size torx tool did you use to take the front panel off?
2mm Allen key on mine. (For reference only, I know it's 2 years old!)
Nice repair. Now you should do a full load test just to make sure it will continue to work.
Would be nice, but I don't have a 800W 4 ohm dummy load.
Man, how come you always get lucky? I was brooding over a switched power supply for a week and couldn't find nada!
Thanks for the new video. How much was that mixer originally? Killed by a fifty cent part.
It seems that new ones are listed for about $800-900.
Sweet.
I have the same problem with my Mackie
I would worry what caused the diode to blow in the first place... 100V rated part on the 12V fan rail shouldn't
have any problems, but if there was an intermittent short on that rail it could blow it - the diode is the fuse for
the rail!
What do you propose to do?
Hi sr you fix mixer ?
I have a question. Have you ever repaired a JBL EON315 that clicks when powered on? Or have you repaired any powered speaker with similar symptoms?
Could you describe the clicks?
I was told no audio is coming out and could be on amp board. When powered on. It does a clicking sound. I hope that helps. I will try to get a video of the sound just don’t want to spend to much if they can’t be repaired
@@eddiegarza6122 Does it power up at all? Is it a similar sort of "ticking" in the power supply I showed in this video?
I’ll check the video out again but I’m hoping so. I will try to get a better understanding of it. I also have a sound mixer that won’t power on. But as for the speaker. It does power on
If it powers up, the problem must be different. What is clicking? Relays? Or, perhaps, you are talking about some clicks from woofer or tweeter?
Wow a 50 cent diode is a 1000 times less than the quoted price for repair...... Yep just board changer repair is going on nowadays........ 25 years ago my buddy owned an electrical company, and worked at the plants in Baton Rouge, La. He was a board changer also, because that's how it works in that industry.... Repairs have to be fast so that equipment has to get up and running fast.....He would bring me the boards and I would repair them at a flat rate per board, back then there were all through hole PCB's .... Most of the time it was common 2SC 945 transistors that would fail.... I had many in stock all the time, since they were common in a lot of circuits.... I would get 100.00 Dollars per board from him, and he still made that and more to change them out..... Not a bad deal.....
I never seen Mackie mixers down here in South West Louisiana , only Peavey and other top brands for musicians..... Take care Mon Ami.....
A professional Engineer normally tests diodes in both directions as it already conducts in one direction.
Are you talking about @6:58? A professional Engineer normally understands that diode conducts not as a short circuit with zero voltage drop.
@@feedback-loop Not everybody that is watching is a professional engineer though.
Well you certainly have your list of admiring followers, but how did you come to the conclusion that the diode was shorted? I haven't a clue from this video, so thumbs down.
Alex took a good look at the topology of the components. He noticed that there was a connection between some of the smaller power-rails and the opto-couplers for some kind of feedback circuit. As he removed the diode to disconnect the first rail to trouble-shoot it (disconnect it form the supply), it quickly became clear that the removed diode by coincidence appeared to be faulty. See: 5:38
Fair enough. Sometimes I skip over some seemingly trivial details. Thanks for reminding me.
I just checked the resistances across the rails as the first crude troubleshooting step. One rail was shorted, which I mentioned, but did not show or explain in detail.
Thumbs down instead of asking in a comment. How self-entitled you are. Just saying.
Good man.