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How to Resolve an OEC C-Arm Precharge Voltage Error

Posted by Alyssa Birchmeier

Feb 21, 2018 2:38:54 PM

:: 1 minute read ::

Precharge Voltage Error.jpgSo, you power on your OEC 9800 or 9900 C-arm and step away for a moment to let it run its boot-up process. When you return, though, boot-up has frozen and the display on your doghouse (the control housing on top of your central column) reads "Precharge Voltage Error". What happened? And what can you do to resolve the error and get your C-arm booted up for the day's exams?

Don't worry! There's a simple explanation for your problem as well as a simple, do-it-yourself solution that clears most Precharge Voltage Errors.

Need immediate C-arm assistance? Click here to request service.

The Cause of Precharge Voltage Errors

The Precharge Error comes up if your C-arm's generator precharge capacitors exceed 250 volts. This excessive voltage can accumulate when the system is connected to AC power for an extended period of time without being used, causing the batteries become overcharged.

The Solution for Precharge Voltage Errors

The solution is to drain the voltage in the batteries down to a level that will allow bootup. To do this, unplug the system from the wall, raise the central column up completely, and lower it back down completely with the arrow buttons on your doghouse. Do this two or three times, then reboot the system to see if the error goes away. If the error persists, raise and lower the column several more times and reboot again. Repeat this cycle until sufficient voltage is drained and the error is cleared.


For many facilities, the volume of patients in their schedule will keep their C-arms in use often enough to prevent overcharging. If your facility operates at a low volume of C-arm cases you can avoid overcharging by unplugging your system and booting it up for an hour or so every few days.

If you have other service questions about OEC 9800 or 9900 C-arms, our Service Team is standing by to help. Use the button below to contact us and let us know what you need.

Request C-Arm Service & Repair



Written by Alyssa Birchmeier

author of blog post

Alyssa Birchmeier is a Service Coordinator at Block Imaging. Her goal is to put service customers first and make a difference in the way they serve their patients. Out of the office she loves cooking, crafting, and exploring the world of craft beer.

Topics: Imaging Equipment Service, C-Arm

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