Brother MFC 7840W - Manual (Page 128)

Troubleshooting
119
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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 pages with a large
amount of graphics at 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.