Canon iPF671 Service Manual page 184

Chapter 4
- Make sure that the linear scale [1] is in the detection zone of the linear encoder sensor [2].
[1] [2]
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b) Action to take after removing or replacing the linear encoder sensor
After the carriage and carriage motor and carriage belt and linear encoder sensor has been removed or replaced, execute the following service mode.
Service mode: SERVICE MODE > ADJUST > CR MOTOR COG
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