Behringer DCX Series User manual

1
BehringerMods.com
Instructions for modification of Behringer DCX analog
inputs and outputs
The following instructions will cover the details of
modifying a DCX for upgraded analog outputs 1- and
analog inputs A & B (input C excluded).
These modifications require a high level of experience
with electronics. If you doubt your ability to complete
the mods correctly, please contact BehringerMods to
arrange an installation service.
BehringerMods take no responsibility for damage
caused to your equipment by modification.

2
The modification package should come with the following parts:
•Analog input and output upgrade PCB
•Link PCB
•Ribbon Cable x2
•PCB Stands x4
Upgrade PCB Link PCB

3
Get a cup of tea or coffee. Remove the equipment cover and keep the
screws in a dish.
Use pointy nosed pliers to gently remove the glue securing the main ribbon
and smaller ribbon cable connecting the rear PCB to the main PCB.
Remove all screws that secure the rear PCB to the case.
Remove the rear PCB from the case.

4
Locate and remove capacitors C2 , C27, C41, C42
Do not damage the PCB, it is delicate.
Tip: Apply new solder to the capacitor legs. Heat one leg until solder is fully
melted, then lean the capacitor to one side pulling the leg partially from
the PCB. Heat the other leg and lean capacitor the other way. Repeat
process until the capacitor is free from the PCB.
Cut the legs of pins 2 and 3 on output XLRs 1- .
Tip: I ma e two cuts, to leave a clear gap.
If you loo inside the front of the soc et, the pins are numbered.

5
Clear solder from the positive pads (round holes, not square) with a solder
sucker or solder wick.
We will connect wires here.

Solder IDC 2 ribbon lines:
Line 18 (Orange) to C41
Line 17 (Yellow) to C2
Line 1 (Green) to C42
Line 15 (Blue) to C27
(Line 1 is blac on the far side of the ribbon, Line 20 is brown. If the ribbon is
not colour coded line 1 has a red stripe)
Line 1 Line 20

7
Solder IDC 2 Lines:
Line 1 to Bottom of C4
Line 2 to Bottom of C3
Solder IDC 2 Lines:
Line 3 (Gray) to XLR 3 - Pin 3
Line 4 (Violet) to XLR 3 - Pin 2
Line 5 (Blue) to XLR 2 - Pin 3
Line (Green) to XLR 2 - Pin 2
Line 7 (Yellow) to XLR 1 – Pin 3
Line 8 (Orange) to XLR 1 – Pin 2
Line 9 (Brown) to XLR – Pin 2
Line 10 (Red) to XLR – Pin 3
Line 11 (Black) to XLR 5 – Pin 2
Line 12 (White) to XLR 5 – Pin 3
Line 13 Gray) to XLR 4 – Pin 2
Line 14 (Violet) to XLR 4 – Pin 3
Line 3
Line 4
Line 5
Line 6
Line 7
Line 8
Line 9
Line 10
Line 11
Line 12
Line 13
Line 14

8
On the Main PCB (not rear PCB)
Remove SMD capacitors C88, C87.
Leave the gap open circuit.
Re-install the rear PCB.
Install the upgrade PCB with self adhesive feet.

9
Connect the Link PCB to the Main PCB ribbon socket.
Tip: Ensure the plug is central. It is possible to place it 1 pin sideways.
Connect the Main ribbon from Rear PCB to the Link PCB.

10
Also re-connect the smaller Rear PCB ribbon.
Upgrades are now complete!
If you removed the ribbon plug from the Upgrade PCB. The ‘Bump’ on the
ribbon plug faces the centre of the PCB on both IDC1 and IDC 2.
Unfortunately due to my mista e there was not space for a full size soc et
body.