BehringerMods.com Instructions for modification of Behringer SRC 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.
Note: The input upgrade has a fixed gain level. The gain knob will only adjust the LED meter after upgrade. The modification package should come with the following parts: Analog Out Mods Populated PCB Ribbon signal cable Ground wire PCB Stands Analog Input Mods Populated PCB Ribbon signal cable Ground wire PCB Stands Ribbon Code: 1) Black = In L + 2) White = In L - 3) Grey = In R + 4) Violet = In R - 5) Blue = V- 6) Green = V+ 7) Yellow = Out L + 8) Orange = Out L - 9) Red = Out R + 10) Brown = Out R -
Remove the equipment cover and keep the screws in a dish. Output Upgrade PCB Input Upgrade PCB Place the upgrade PCBs in the case using the self-adhesive stands. Leave space for the ribbon cable plug to enter the PCB.
Connect ribbon cables to the upgrade PCBs. Cut the ribbons to length. Input PCB Ribbon should reach the furthest input XLR. NOTE: If installing input and output upgrades together, the Green and Blue wires on the input PCB ribbon need to reach the V+, V- pads on the output PCB. Output PCB ribbon should reach the furthest output XLR. Disconnect all cables and wires to the main PCB, including ground strap.
Remove the main PCB. Keep the screws in a dish. Output Upgrade Locate op-amps IC14, IC15 on the rear of the main PCB. Disable both op-amps by cutting the two power legs on each chip. Be carful not to damage the PCB.
To disable un-used op-amps the two power legs 4 and 8 (Vcc-, Vcc+) must be cut. Small circle marks the top left of the chip. Use a new sharp blade. Cut towards the chip body, not towards the PCB. Ensure a clear gap at the cut. Be carful, the PCB must not be damaged.
Solder the output PCB ribbon wires to the main PCB as shown. Black > Bottom R112 White > Bottom R47 Grey > Bottom R114 Violet > Bottom R113 Cut the back of pins 2 and 3 on each output XLR. Use side-cutters. Leave a clear gap.
Solder the wires to the output XLR pins as shown. Yellow > Out L XLR Pin 2 Orange > Out XLR Pin 3 Red > Out R XLR Pin 2 Brown > Out R XLR Pin 3
Solder the output PCB ribbon wires as shown. Blue is picking up -15V, Green is picking up +15V. Blue > Top C111 Green > Top C118. If you are only installing the output upgrade, proceed to fitting the analog ground wire near the end of these instructions.
Input Upgrade Locate IC7, IC17 and remove them completely. Use a new sharp knife. Cut towards the chip body, not towards the PCB. Cut each chip leg in turn. Support the chip body with your finger. Be carful not to damage the PCB.
Remove resistors R48, R49, R132, R133. Remove capacitors C70, C71. Solder input PCB ribbon as shown. Capacitor marking is on the top of the main PCB. Round pad is the positive leg, square pad is the negative leg. Black > C1 Positive Leg Violet > C5 Positive Leg Grey > C6 Positive Leg White > C21 Positive Leg
Solder Input PCB ribbon wires as shown. Brown > Bottom R122 Red > Bottom R115 Orange > Top R123 Yellow > Top R24
If you are only installing the Input upgrade, connect the Green and Blue wires as shown. If you are installing the Input and Output upgrades together, proceed below. Connect the Input PCB Green and Blue wires as shown. This will chain power from the Output PCB to the Input PCB. Green > Output PCB V+ Pad Blue > Output PCB V- Pad
Analog Ground Output upgrade ground. Use the supplied stranded wire to connect: Out L XLR Pin 1 > Output upgrade PCB GND pad. Input upgrade ground. Use the supplied stranded wire to connect: Input upgrade PCB GND pad > Output upgrade PCB GND pad. If you are only installing the Input Upgrade: Connect GND pad > Out L XLR Pin 1.
Re-connect all wires and cables. The upgrades should now be complete. Read the instructions again and check your work! Ensure there are no wire cuttings or solder in the case, the soldered wires are not touching other parts and solder has not splashed to the PCBs. Congratulations and enjoy!