The Blackmagic Design Spares - Camera URSA Mini - PCB CFast is the dedicated storage interface board for the URSA Mini ecosystem. While the Main PCB handles the image processing, this secondary board is the high-speed "loading dock" that manages the physical connection and data throughput to the CFast 2.0 cards.
The High-Speed Data Gatekeeper
Because Blackmagic RAW and ProRes 4444 XQ require massive bitrates (sometimes exceeding $500\text{MB/s}$), this PCB is engineered for extreme data stability.
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Dual-Slot Controller: It manages the logic for "redundant" or "overflow" recording, allowing the camera to seamlessly switch from Card A to Card B without dropping a single frame.
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SATA-III Bridging: It converts the internal system bus signals into the SATA-III protocol used by CFast 2.0 media.
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Power Regulation: Provides the stable, low-ripple voltage required by high-performance CFast cards, which can draw significant power during long recording sessions.
When to Replace the CFast PCB
This board is often the first to fail in high-volume production environments due to the physical wear of the card slots.
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"Card Not Found" Errors: If the camera refuses to recognize cards in one or both slots, but those same cards work fine in a computer reader, the pins on the PCB are likely bent or oxidized.
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Bent Pins: CFast slots use a high-density pin array. If a card is forced in backwards or at an angle, it can physically crush the pins. Because these are surface-mounted, it is usually more cost-effective to replace the whole PCB than to solder new pins.
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Recording Drops/Corrupted Clips: If the camera intermittently stops recording or "drops frames" specifically when using the CFast slots (but works fine via USB-C or SD), the data buffer chips on this PCB may be failing.
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Physical Ejector Failure: The mechanical spring-loaded ejectors are integrated into the slot assembly on this board. If they snap or become "mushy," the PCB must be replaced to ensure cards can be safely removed.
Key Features
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Genuine OEM Part: Specifically designed to fit the mounting standoffs behind the URSA Mini's fold-out door.
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Shielded Design: Features specialized electromagnetic shielding to prevent the high-speed storage clock from interfering with the camera's audio circuitry.
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High-Cycle Connectors: Rated for thousands of insertions/ejections to withstand the rigors of daily production.
Technical Installation Note
Replacing the CFast PCB is a Level 2 repair. You will need to access the interior side of the media bay.
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Ribbon Cable Management: The CFast board connects to the Main PCB via a high-bandwidth ribbon cable. Warning: This cable is often very short. Be extremely careful when opening the chassis so you don't "yank" the connector off the board.
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Clean the Pins: Before installing the new board, ensure your CFast cards are clean. Inserting a card with debris in its holes into a brand-new PCB can instantly bend the new pins.
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Grounding: Ensure the mounting screws are tightened properly. The PCB uses these screw points as a path to ground to prevent static buildup on the cards.
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Firmware Note: After replacement, it is good practice to run the Blackmagic Camera Setup utility. While this board doesn't usually require a firmware flash, the system needs to verify the new hardware handshake for dual-card recording.
Pro Tip: If only one slot is failing, check inside the port with a flashlight. Sometimes a tiny piece of plastic from a cheap CFast card casing can break off and block the pins. If you can clear the obstruction with a non-conductive plastic pick, you might save yourself a hardware replacement!
Is the camera failing to see cards in both slots, or did one of the pins physically break in a single slot?
