Brother Ensemble PDP-300CJ Owner's Manual page 349

What to do if an error occurs. . .
Error Condition
Scanner is unplugged.
There is not enough memory.
Scan is canceled.
Scanner 324
Message
The scanner is not responding.
Check the scanner connection at
the back of the machine and try
the operation again.
There is not enough memory to
scan. Close some applications or
documents and try the operation
again.
The scanner is not responding.
Check the scanner connection at
the back of the machine and try
the operation again.
Solution
Check the scanner connection at
the back of the machine. Try the
operation again.
Close applications or documents.
Try the operation again.
Try the operation again. Keep
the scanner moving.