Midas XL4

[Isra]

Hello!
I got here some Modules of a Midas XL4 Desk, like 4x XL401, 4x XL402,  3x XL414, 1x XL441.
I would like to bring them to Life again and need for that some Schematics.
Everything about the Connectors of the Modules would be pretty helpful like where to put Power on it or Signal Paths.

Thanks for any Help!

 

[Isra]

Hello Guys!
Finally I got some Material to work with! Here is a Pic of the Connector at the Mic Preamp. Does anyone knows what I have to do with the Connector No. 7, LED_I_REF ?
It seems that the LED's are not working with only the 5v, 18V and 48V. So it should have something to do with the LED_I_REF.

Any Ideas?

 

[ijzerpro]

the leds are in series from a source , most of the time 10.

 

[Khron]

"I" is often used in reference to currents.
I kinda wonder whether this might use a similar arrangement to what i've seen in level-meters in smaller mixers, ie. a current-sink referenced to the negative op-amp rail, and a string of LEDs between that and the positive rail.

http://www.4qdtec.com/LED/diags/audvu.gif