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Midas 3000 legend
Midas 3000 legend
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Old 7th February 2018, 03:22 PM   #11
angelothewolf is offline angelothewolf  Argentina
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Join Date: Jun 2010
Location: brazil
Quote:
Originally Posted by Tajzmaj View Post
Hi,
I have same desk and I've rebuilt mine few years ago. Probably you will find many bad electrolytic caps. Most are 100uF/25V. If you have completely dead preamps there are 2 10E smd resistors in power supply lines for each preamp. Those fail quite often.
Most problems with Legend are caused by bad ribbon cables. Actually connectors are crimped to cabled and those joints are prone to fail. It's causing things like dead channels, losing aux sends, even losing master outputs. If you like the desk I suggest you replacing those with something soldered together. I'm actually in the process right now.
Also I have complete schematics. It's too big to upload it here and it might be forbidden to make it public by forum rules, I'm not sure. P.M me and it's yours.
I've solved quite some problems with my desk and if you have any additional questions I might be able to help.

Cheers, Taj
Thank you! Im finding all that kind of problems that you mentioned. I could get rid of most of them. Now I have two channels in the same module with low and distorted output, another preamp making crackling noises and one completely dead.
other issue is the automation System is not working properly, the channel assignment leds are not changing when I press the SET button. all aux sends status leds are off (except for one channel that all the aux leds are working).

I replace the batteries of the Automation PCBs and now is like that, before it was working, Its like the firmware its gone. Actually when power up it shows the version on the display I think its 1.71, but after boot it gets stuck
I could get the service manual but it has no firmware software, I think will be good idea to reinstall it but I dont know where I can get the code. Do you have it?
I think could be interesting to share each other the service info to see if we have the same information.
thank you for your time, if you have some indication about the problems above let me know!
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Old 7th February 2018, 04:44 PM   #12
Tajzmaj is offline Tajzmaj  Slovenia
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Join Date: Mar 2011
Location: Ljubljana
I was afraid you are going to say that you have problems with computer. I don't have any experiences with such problems. One thing which crosses my mind is have you stack modules back to same slots. I mean like first module is still first etc ? Each module has it's address and it might behave strange if you mix it up.
I've replaced batteries also and my desk behave normally.

Preamps and dead or distorted channels are either bad capacitors or bad connections at crimped connectors. I actually bought weller de-soldering rig to replace all capacitors in that desk. It's few 1000 inside which means it's almost impossible to do it without. It took me some 10 days to re-cap whole desk. But believe me, it's worth every second and every penny. Luckily elcos are really cheap.

Check 10E smd resistors on each preamp in case of problems with preamps. Those really fail often.

Ah..have you reset computer after you replaced batteries? There is reset knob on master module. Have you tried to switch system a system b ?

cool
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Old 7th February 2018, 04:51 PM   #13
Tajzmaj is offline Tajzmaj  Slovenia
diyAudio Member
 
Join Date: Mar 2011
Location: Ljubljana
Ah...firmware, no I'm sorry, I don't have it.

cheers
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