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Behringer DCX series Instructions For Modification
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Behringer DCX series Instructions For Modification

For analog inputs and outputs
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BehringerMods.com
Instructions for modification of Behringer DCX analog inputs and
outputs
The following instructions will cover the details of fully modifying a unit with analog output and
analog input upgrades. Steps that are specific to these options will be labelled and can be
skipped if you did not purchase them.
These modifications require a high level of assembly and skill. It is not recommended for a
beginner at 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.

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Summary of Contents for Behringer DCX series

  • Page 1 BehringerMods.com Instructions for modification of Behringer DCX analog inputs and outputs The following instructions will cover the details of fully modifying a unit with analog output and analog input upgrades. Steps that are specific to these options will be labelled and can be skipped if you did not purchase them.
  • Page 2 The modification package should come with the following parts: Analog Out Mods Populated PCB(s) Ribbon signal cable Ground wire PCB Stands Analog Input Mods Populated PCB(s) Ribbon signal cable Ground wire PCB Stands Below is a diagram showing how the components should be connected for a fully modified unit. Colours are for visual clarity, they do not match the actual wire colours.
  • Page 3 Remove the equipment cover and keep the screws in a dish. The PCBs will be placed as shown. Input Upgrade PCB left, Output Upgrade PCBs right. The output PCBs come as a stack of 3 to upgrade 6 channels. The output stack needs 3x 3.5mm holes drilled in the case.
  • Page 4 (OUTPUT MODS) Take one Output Upgrade PCB, hold it carefully in position and mark the 3 holes on the case. Use sharp pliers to gently remove the glue securing the ribbon connectors on the Main PCB. If your DCX is older you can also remove the power connector.
  • Page 5 Disconnect the ribbon cables. Remove all screws from the Rear PCB. Remove Rear PCB and keep safe.
  • Page 6 If your DCX does not have a detachable PSU connector: Turn the DCX over and remove 4 screws holding the power supply. Detach the mains power connector from the power supply.
  • Page 7 Remove 4 screws holding Main PCB. Keep Main PCB and Power Supply in a safe place. (OUTPUT MODS) If you have a center punch, use it to mark the PCB hole positions.
  • Page 8 (OUTPUT MODS) Place a piece of wood under the equipment and 3x 3.5mm holes carefully in the correct position. (OUTPUT MODS) Use a large drill by hand to remove rough edges on the holes. (OUTPUT MODS) Place M3 screw through bottom of case.
  • Page 9 (OUTPUT MODS) Attach the three 5mm PCB Stand in the case. (OUTPUT MODS) Ensure the Output Upgrade PCB fits on top.
  • Page 10 Replace Main PCB temporarily. Trim the length of all ribbon cables. Output Upgrade Ribbons: Black, White, Grey, Violet - must reach Main PCB Ribbon Socket. Yellow, Orange, Red, Brown - must reach Output XLRs 1&2, 3&4, 5&6 per PCB ribbon. Green, Blue - must reach Rear PCB area near output XLR 1.
  • Page 11 (OUTPUT MODS) On the Rear PCB. Cut pins 2 & 3 on each output XLR that you will upgrade. Make a clear gap to disconnect it from the Rear PCB. (INPUT MODS) Locate electrolytic capacitors C26, C27, C41, C42 and remove them carefully. Do not damage the PCB, it is delicate. Tip: Apply new solder to the capacitor legs.
  • Page 12 (INPUT MODS) Clear the positive pads (round holes, not square) with a solder sucker or solder wick. We will connect wires here.
  • Page 13 To disable un-used op-amps the two power legs (Vcc+, Vcc-) must be cut. Use a new sharp blade. Cut towards the chip body, not the PCB. Ensure a clear gap at the cut. Be carful, the PCB must not be damaged. Cut towards the chip body.
  • Page 14 (INPUT MODS) Op-amps to disable for Input Upgrade, on back of Rear PCB. IC7, IC8, IC10. Tip: Do not disable IC9, IC10 these control Input C. (OUTPUT MODS) Op-amps to disable for output upgrades on Rear PCB top and bottom. Output 1 &...
  • Page 15 (INPUT MODS) Strip, twist and tin shown ribbon wires for the Input Upgrade PCB. Solder them in the positive (round) pads of the removed capacitors: White = C41, Black = C26, Violet = C42, Grey = C27 (INPUT MODS) Solder Input Upgrade PCB ribbon wires to the back of the Main PCB Ribbon Socket. Main PCB placed as shown, connector on the bottom.
  • Page 16 (OUTPUT MODS) Solder Output Upgrade PCB ribbon wires to the back of the Main PCB Ribbon Socket. Main PCB placed as shown, connector on the bottom. Channels 5&6: White = Bottom row, Pin7. Violet = Bottom row, Pin 8. Black = Top row, Pin 7. Grey = Top row, Pin 8. Channels 3&4: White = Bottom row, Pin9.
  • Page 17 (INPUT MODS) On the newer DCX version, look at the top of Main PCB. Remove small capacitors C87, C88. Tip: Heat both sides of the capacitor at the same time to easily remove with soldering iron. Do not leave solder bridging the capacitor connection pads.
  • Page 18 Install everything back in the case. (OUTPUT MODS) Connect the Output Upgrade PCB ribs to the XLRs. Yellow = XLR 1, Pin 2. Orange = XLR1, Pin 3. Red = XLR 2, Pin 2. Brown = XLR 2, Pin 3. Repeat for Outputs 3, 4, 5, 6.
  • Page 19 (OUTPUT MODS) This shows the DAC and Main Ribbon connection positions for each Output XLR. It may help you ensure connection of the correct ribbons. (OUTPUT MODS) All output XLRs connected. Tidy up wires with zip-ties.
  • Page 20 (OUTPUT MODS) Connect Output Upgrade PCB 1 Green and Blue wires >> to Rear PCB. (INPUT MODS) If you *only* have an Input Upgrade (no output upgrades) connect the Green and Blue wires >> to Rear PCB. If you have Input and Output upgrades together, connect the Output Upgrade PCB 1 as described above. Green = Bottom of C3 Blue = Bottom of C4 Tip: Apply some fresh solder to the bottom of the capacitor pad.
  • Page 21 (OUTPUT MODS) Connect XLR 1, Pin 1 (ground) >> to Output Upgrade PCB ‘GND 1’ pad. (INPUT MODS) If you *only* have an Input Upgrade (no output upgrades) connect XLR 1, Pin1 >> to the Input Upgrade PCB ‘GNDA’ pad. If you have Input and Output upgrades together, connect the Output Upgrade PCB 1 as described above.
  • Page 22 (OUTPUT MODS) Connect Output Upgrade PCB 2 ‘GND’ pad >> to Output Upgrade PCB 1 ‘GND’ pad. This will link the ground. (OUTPUT MODS) Connect Output Upgrade PCB 3 ‘GND’ pad >> to Output Upgrade PCB 2 ‘GND’ pad. This will link the ground.
  • Page 23 (INPUT MODS) Connect Input Upgrade PCB Green and Blue wires >> to Output Upgrade PCB 3 ‘+V and –V’ Pads. Connect Input Upgrade PCB ‘GNDA’ pad >> to Output Upgrade PCB 3 ‘GND’ pad. If you *only* have an Input Upgrade (no output upgrades), these should be connected directly to the Rear PCB as descried in previous steps.
  • Page 24 (INPUT MODS) The input mods should now be complete. Ribbon wires Black, White, Grey, Violet should be soldered to the pads of removed capacitors C26, C27, C41, C42 on the rear PCB. Ribbon wires Yellow, Orange, Red, Brown should be soldered to the Main PCB ribbon socket. Green and Blue wires should connect to the V+ and V- pads on an Output Upgrade PCB.