Canon iR C6800 Series Service Manual page 1171

Chapter 15
<EXP ROT>
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Use it to set the length of time for pre exposure at time of last rotation.
Range of Settings
Range of Settings 0: forced pre exposure last rotation disabled
1: 30 sec
2: 1 min
3: 1 min 30 sec
4: 2 min
at time of shipment/upon RAM initialization: 1
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