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Midas XL3

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Midas XL3

Postby Sonolink » Mon Jun 23, 2014 11:47 am

Hello to everyone,

I would appreciate your help and advice on the following matter:

I bought 8 stereo modules (XL304) and a VCA Faders module (XL302) from a Midas XL3. I also have a couple power supply modules.

I've been studying the service manual and the diagrams (attached) but I have a few doubts and would like to make sure I don't fry anything.  What I'd like to do is to rack everything up and add a master output. The doubts I have are mainly about some connections.
This is the service manual:
https://www.dropbox.com/s/fqzpp1tn6ug3jfm/midas_xl3.pdf
Here is the Pin assignment:
https://www.dropbox.com/s/h8qim8440qdq7v2/PinsA.jpg

This is what I have figured out so far.
Please could you confirm if it's correct?

-Component side is L channel, solder side is R channel on each stereo module.

Connector A:
1-power ground (+18vdc)

2-iref. What's this??

3-  +18vdc
4- power ground (-18vdc)
5-  -18vdc
6- 48vdc positive pin
7- Input A hot (from mic xlrf pin 2 input connector)
8- Input A cold (from mic xlrf pin 3 input connector)
9- input shield (from mic xlrf and line jack shield input connector)
10- Input B hot (from line jack tip input connector)
11- Input B cold (from line jack ring input connector)
12- Direct out R ch hot (to direct out jack tip output connector)
13- L ch insert send hot (to jack tip insert send connector)
14- L ch insert send cold (to jack ring insert send connector) 
15- L ch insert return hot (to jack tip insert return connector)
16- L ch insert return cold (to jack ring insert return connector)
17- Direct out L ch hot (to direct out jack tip output connector)

18- In gnd. Which gnd is that?

19- R ch insert send hot (to jack tip insert send connector)
20- R ch insert send cold (to jack ring insert send connector) 
21- R ch insert return hot (to jack tip insert return connector)
22- R ch insert return cold (to jack ring insert return connector)

Is all this correct? Do you know what connects to pins 2 and 18?
Where are the insert and direct out grounds?

I would appreciate your help very much. Thank you for your time and help

Cheers
Sonolink
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Re: Midas XL3

Postby The Korff » Mon Jun 23, 2014 3:50 pm

Are the insert points and direct outs balanced? The 'In Grnd' pin might be a shared ground for both input A and input B (looks like a dual-input module with a flip switch?)

Cheers!

Chris
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Re: Midas XL3

Postby Sonolink » Mon Jun 23, 2014 9:01 pm

Thanks for your reply. It is a dual input (mic/line)
Wouldn't input gnd rather be pin 9 labelled input_s?
Direct out and insert send & return seem to be balanced (hence the labelling (h) and (c) which would seem to indicate hot and cold but I can't see ground other than in-gnd (pin 18). Would that be a common ground for all direct outs and inserts?

Or could it be that grounds are only connected on the external connector side? If so what would pin 18 be then?
Would that make sense?

Any idea of what lref is? (Pin 2)

Thanks a lot for your time and help
Sonolink
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Joined: Sun Jun 22, 2014 11:00 pm

Re: Midas XL3

Postby Studio Support Gnome » Tue Jun 24, 2014 12:33 am

No it's not all correct…… some bits are wrong…..




1) 0V reference
2) iRef. means "Reference Current"…. not sure about it's use in the midas, it MIGHT be a constant current input for +5v supply for logic circuits (solo switching etc) and LED driver use. i've not the time right now to go through the circuit diagrams and check…..
3) +18V DC , positive PSU rail supply to active devices (op-amp supply +ve rail)
4) 0V centre reference again. (centre tap of power supply that provides relative -18v on one side, +18v on the other, and a 0v reference in the middle )
5) -18V DC Negative PSU rail ( the other side of the op=amp supply rail)
6) +48v Phantom power supply (for mic input)




18) IN(S)-GRND (i think offhand that's a common ground connection across all insert send/return connectors , think it's a misprint missing the s by mistake . )
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Re: Midas XL3

Postby Sonolink » Tue Jun 24, 2014 11:45 pm

Thanks a lot for your reply
Now I need to find out if I need that "iref" pin to rack the input and the vca modules and If I do, where to connect it.
Thanks mate!
Cheers
Sono
Sonolink
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