Brother HL-2600CN Service Manual page 260

4.3.15 Belt Sensor (DPJ) / Oil Sensor (OIL)
1) Release the three hooks. Then release the one hook by lifting the oil sensor cover
slightly.
2) Remove the set screw ST3X6 (2 pc.) to remove the oil sensor from the frame.
3) Release the two hooks to remove the belt sensor from the frame.
Hook
Fig.7-66
Belt sensor
Fig.7-67
VII-48
Hook
Oil sensor cover
Hook
Hook
Oil sensor