Audio
DiGiCo SD-Rack / racks troubleshooting
The DiGiCo SD-Rack / racks problems live-event techs bring to Ask Roadie most (also called D2-Rack, DMI card, SD-MiNi Rack, SD-Rack). Pick your symptom, or describe your own in plain words, and get the likeliest fix first, with the manual page when there is one.
Common SD-Rack / racks errors & problems
What techs run into most, and what's usually behind it. The step-by-step fix for your exact unit is in Ask Roadie.
- Step-by-step fixGet the fix →
Clicks, pops or periodic resync across all channels / no clean audio
Likely cause: MADI/Optocore audio is only clean when every device slaves to one clock at the same rate; a flashing green rack screen is the quick visual confirmation of lock.
- Step-by-step fixGet the fix →
D2-Rack specs reference
Likely cause: D2-Rack has a fixed I/O layout unlike the modular SD-Rack; the Cat5-vs-BNC ordering distinction matters for connectivity.
- Step-by-step fixGet the fix →
How to update SD-Rack rack firmware (chassis) via USB
Likely cause: The rack carries its own FPGA/chassis firmware that must track the console software version; the front USB + Control app is the sanctioned path.
- Step-by-step fixGet the fix →
MADI-over-Cat5 (DMI / D2-Rack) link passes no audio between two devices
Likely cause: The Cat5 MADI link is asymmetric by design; a console-mode port must talk to a rack-mode port, mirroring the console/rack relationship.
- Step-by-step fixGet the fix →
Only 56 channels over MADI / cannot get all I/O at 96kHz
Likely cause: MADI bandwidth halves at double sample rate, so 96k needs two ports for one full stream; Optocore avoids the trade-off.
- Step-by-step fixGet the fix →
Optocore error after pressing Remap still throws error / device count wrong
Likely cause: Optocore remap only succeeds when every device on the loop agrees on IDs, ports and output-card ownership; step 5 (card ownership mismatch) is where most techs get stuck.
- Step-by-step fixGet the fix →
Rack not connecting / intermittent chassis dropout on Optocore loop
Likely cause: Optocore is a fibre ring - one dirty/loose LC or a crossed loop breaks comms for the affected node; correct ID banding prevents address clashes.
- Step-by-step fixGet the fix →
Red card entries / firmware version mismatch in Audio I/O after software upgrade
Likely cause: Card firmware is pushed over MADI one card at a time; a failed flash leaves a mismatch that clears only after an engine+rack restart and re-run.
- Step-by-step fixGet the fix →
SD-MiNi Rack specs reference
Likely cause: Compact rack for smaller rigs; techs need the different slot count, weight and power vs the full SD-Rack.
Not on the list? Describe it your way, or paste the error code off the display. Ask Roadie works the problem with you until it's fixed or you have a clear next move.
How Ask Roadie helps with the SD-Rack / racks
- 1. Pick the DiGiCo SD-Rack / racks. It's already in the list.
- 2. Describe what you're seeing. In your own words, or the error code off the screen.
- 3. Get the likeliest fix first. Steps in order, the manual page when there is one, and a note when other techs have confirmed it.
- 4. Still broken? Tap 👎 and it keeps going from where you left off.
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