The Blackmagic Design Spares - Camera URSA Mini - Fan is the primary active cooling component for the URSA Mini and URSA Mini Pro series. Because these cameras house a high-performance CMOS sensor and a sophisticated FPGA (image processor) that generates significant heat, the fan is critical for maintaining stable operation and preventing sensor "thermal noise" or emergency shutdowns.
The "Wind Tunnel" Design
The URSA Mini uses a unique thermal management system often referred to as a "wind tunnel."
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Isolation: The fan is part of a cooling module that is physically isolated from the sensor and the internal electronics. This prevents dust and moisture from being blown directly onto the circuit boards or the sensor glass.
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Variable Speed: The camera’s firmware dynamically adjusts the fan speed based on the internal temperature sensors. If you are shooting in high-frame rates (HFR) or 12K, the fan will spin faster to compensate for the increased processing load.
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"Stealth" Mode: In the camera settings, you can set the fan to "Quiet" during recording, which slows the fan down to prevent acoustic noise from bleeding into your microphones.
When to Replace the Fan
The fan is one of the few moving parts in the camera and is subject to mechanical wear.
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Grinding or Rattling Noise: This is the most common symptom. It indicates that the bearings are failing or that a small piece of debris (like a stray blade of grass or a screw) has entered the fan housing.
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"Overheating" Warnings: If the camera displays a temperature warning and shuts down, but you cannot hear or feel air moving from the top vents, the fan motor has likely failed.
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Excessive Vibration: A failing fan can create micro-vibrations that can be felt through the camera body. In extreme cases, this can even affect the stability of the image if you are using very long lenses.
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Seized Motor: In environments with high humidity or salt air, the fan motor can seize due to corrosion, especially if the camera has been sitting idle for a long period.
Key Features
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Brushless DC Motor: Designed for high longevity and low electrical noise, ensuring it doesn't interfere with the camera's video signals.
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Balanced Blades: Precision-weighted to minimize vibration, which is crucial for a handheld cinema camera.
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3-Pin or 4-Pin Connector: Uses a standard micro-header that plugs directly into the Main PCB for power and PWM (Pulse Width Modulation) speed control.
Technical Installation Note
Replacing the fan is a Level 2 repair. It requires opening the camera chassis.
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Access Point: The fan is typically located behind the right-side panel or under the top escutcheon. You will need to remove the side panel to access the power connector on the Main PCB.
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Dust Removal: While the camera is open, it is the perfect time to use a can of compressed air to clear the heat sink fins. A clean heat sink allows the new fan to work much more efficiently.
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Cable Routing: The fan's power wires must be routed carefully. If they are allowed to touch the fan blades, the fan will chop through the wires, causing a short circuit and potentially damaging the Main PCB.
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Firmware Calibration: After installing a new fan, it is recommended to update or refresh the camera firmware. This ensures the system correctly calibrates the RPM range of the new motor.
Pro Tip: If your fan is making noise only while recording, check your Setup Menu under the "Monitor" tab. You may have the fan set to a speed that is hitting a specific resonant frequency of your camera rig. Adjusting the "Fan Speed" setting might solve the noise issue without needing a hardware replacement.
Is your fan making a physical grinding noise, or are you getting an "Overheating" message on the screen?
