RED V-Raptor / Milo - Universal Sync Box Failure and Misconnection Risk¶
Summary¶
A Milo/V-Raptor setup showed a green sync light on the Universal Sync Box but no sync pulse reaching Flair. The final diagnosis was Universal Sync Box failure, with two possible causes: an internal ribbon/connector fault, or damage caused by routing sync through the Trigger Box while its camera emulator was enabled.
Symptoms¶
- Universal Sync Box green LED shows incoming sync.
- Camera run/stop still works.
- Flair test window does not see sync pulse.
- No sync reaches RT14/Cinebot/Milo path.
- Issue persists after camera-side settings appear correct.
WhatsApp Excerpts¶
| Timestamp | User | Evidence |
|---|---|---|
| 2026-03-27 02:43 | Jeremy Andrews | Milo had no sync pulse from RED V-Raptor; tried Universal Sync Box through roll-axis D-type; box showed power and green sync light. |
| 2026-03-27 02:57 | Timothy Smith | Described expected wiring chain: V-Raptor R/S and sync cables to Universal Sync Box, through roll slip-ring D-type camera accessories port, Milo umbilical to camera accessories port, trigger box ribbon cable to RT14; suggested spare ribbon cable. |
| 2026-03-27 04:28 | Arturo | Asked whether RED sync cable to Universal Sync Box was used. |
| 2026-03-27 07:17 | Jeremy Andrews | Confirmed Universal Sync Box failure; multiple issues. |
| 2026-03-27 07:22 | Jeremy Andrews | Cam accessories cable had been plugged into the lower trigger-box plug rather than sync socket on ribbon cable, likely blowing the sync box. |
| 2026-03-27 07:30 | Jeremy Andrews | Listed two causes: internal ribbon disconnect, or sync through trigger box while sync emulator is on blowing the Universal Sync Box. |
Community Solutions¶
[CONFIRMED] Swap In A Known-Good Universal Sync Box¶
If green sync LED is present but no output reaches Flair, test with a spare Universal Sync Box. In the reported case, the box itself was faulty.
Confidence: 0.9
[LIKELY] Inspect Internal Ribbon / Connector Path¶
An internal ribbon disconnect or connector-pin issue can allow the box to show input activity while failing to pass sync onward.
Confidence: 0.74
[DANGEROUS] Do Not Route Sync Through Trigger Box With Camera Emulator Enabled¶
If a system routes camera sync to RT14, connecting sync through the Trigger Box while the trigger-box camera emulator is on may put additional voltage on the circuit and damage the Universal Sync Box.
Confidence: 0.86
Related Discussion Evidence¶
No image/video attachment in the final diagnosis, but discussion references Milo cabling and Universal Sync Box routing.
Official Documentation References¶
- Flair Virtual Production Sync Box QSG — p.7: default 50 Hz data output and supported sync/data modes
- Flair Virtual Production Sync Box QSG — p.9: No Sync / send-on-data behaviour
- Camera Sync and Trigger V2 — RED camera sync/trigger cable matrix
- Trigger Box QSG — printed p.2: ribbon cable SYNC / BLOOP / TRIGGER routing
- Trigger Box QSG — printed p.10: using the Sync input from a camera
- Trigger Box QSG — printed p.12: sync and camera controls / simulated camera generator
- Trigger Box QSG — printed p.17: return Trigger Box to normal working mode