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Alastair Rae

Arri LF/PRO Power Problem

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When using the Arri LF camera on my PRO over a fourteen-week shoot I had problems with the camera randomly switching off. I changed all cables and tried a different camera body. Optical Support in London have stripped the rig and can find no weak spots in the wiring. Has anyone had a similar experience?

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Camera powered down or stopped recording? Were you rolling endlessly? I have seen that camera overheat and stop recording (in studio mode).  You can’t roll endlessly but I think you’re talking strictly power.  

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Hi Alastair,

what version of a PRO rig do you have?

Did you on/off switch any other devices on your rig that was in sync with the LF turning off?

Did it turn off or did it reboot?

Preston in the mix? Powered over the rig or camera?

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Thanks for your replies Gentlemen,

The camera powered down and would then reboot. It rarely happened during shooting but rather when we were waiting to shoot or moving to the next shooting position. The problem occurred with two different camera bodies. There was no Preston involved, only a Teradek transmitter powered through the rig.

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I had similar issues with regular Alexas and REDs in combination with my Ultimate 1 electronics.

12 vdc was hard wired, so always power on the camera. The moment I switched the Ultimate 1 electronics on (28vdc inverter and some minor bits and pieces) the camera did a reboot. Probably it takes only a few milliseconds of a voltage drop to cause an off/on at the camera.

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Thanks for all that information Gentleman. Optical Support have failed to find a problem on my rig after a month of tests so it is a comfort to read your words.

 

Best wishes,

 

Al x

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What jumper blocks are you using? I've had success with using the one with C/A on top, empty on bottom and M on the front and had no power issues. 

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