Brother MFC-9840CDW Network User's Manual page 173

Troubleshooting
Error during printing
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If you try to print while other users are printing large amounts of data (e.g. many pages or color pages with
high resolution), the printer is unable to accept your print job until the ongoing printing is finished. If the waiting
time of your print job exceeds a certain limit, a time out situation occurs, which causes the error message. In
such situations, execute the print job again after the other jobs are completed.
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