SC No. Level Error Name/Error Condition/Major Cause/Solution
1. Reconnect the harness of the CIS.
2. Replace the following parts.
 Replace the CIS
 Replace the MPU.
 Replace the harness of the CIS.
SC No. Level Error Name/Error Condition/Major Cause/Solution
120-00 B Scanner home position error 1
 The scanner home position sensor does not go OFF even if
the scanner moves 30 mm at homing.
 The scanner home position sensor does not go OFF even if
the scanner moves 13 mm at the white balance adjustment.
 The scanner home position sensor goes ON before the
scanner reaches the specified position (in the sensor OFF
area) at returning from the scanning position.
 This SC is issued only when the error signal of the scanner
HP sensor is detected three times consecutively to prevent
the sensor detection error due to some noise.
 Motor driver defective
 Motor defective
 Scanner HP sensor defective
 Harness defective
 Timing belt, pulley, wire, or carriage not installed correctly
1. Perform the following operations.
 Check the harness.
 Check the timing belt, pulley, wire, or carriage
installation.
2. Replace the following parts.
 Replace the scanner motor.
 Replace the scanner HP sensor.
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