Ricoh D124-17 Service Manual page 348

4. Replacement and Adjustment
2. Disconnect the cover plate ( x2)
3. Remove the cover plate.
4. The upper sensor [1] is the bypass sensor, and the lower sensor [2] is the pre-registration sensor.
5. The yellow connector [3] is on the harness for the bypass sensor (the upper sensor), and the white
connector [4] is on the harness for the pre-registration sensor (the lower sensor).
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