Hitachi HT-4139-28 Maintenance Manual page 96

■Replacing the Sensor (PC20 Emission), Reflection Sensor(PC21,PC31), PC22 ASSY, Cover (PC22)K
① Remove the Main Cover (L)(R), the Side Cover(L) (R), and the Back Cover. For instructions, please refer to
"8.1 Preparation"
② Remove the Hopper. For instructions, please refer to "8.3.7 Replacing the Hopper"
③ Remove the PS ASSY (eclectic power unit). For instructions, please refer to "8.3.1 Replacing the PS ASSY"
④ Unscrew 2 bind-head screws and remove the Front Guide. For instructions, please refer to "8.3.15 Drive
Roller".
⑤ Remove the Guide (Lower Mirror) and the Cover glass assembly. For instructions, please refer to "8.3.13
Replacing the Lower Mirror ASSY", "8.3.14 Replacing the Cover Sheet assembly and the Cover glass assembly"
⑥ Unscrew 5 bind-head screws from the Lower Guide ASSY. For instructions, please refer to "8.3.15 Replacing
the Drive Roller"
⑦ Disconnect the sensor from the middle connector
⑧ Remove the sensor from the device
- Unscrew 1 countersunk screw from the Lower Guide ASSY, and remove the Sensor (Emission)
- Unscrew 1 hexagonal screw from the Lower Guide ASSY, and remove the Reflection Sensor and the Main
Cover (L) ASSY (K)
- Unscrew 1 hexagonal screw from the Lower Guide ASSY, and remove the Reflection Sensor
⑨ Attach new sensors
⑩ Take the reverse step to attach the sensor
⑪ After replacing the part, run the Auto Calibration Test.(refer to Chaper6)
#54 Sensor (Emission)（PC20）
countersunk screw
hexagonal screw
hexagonal screw
Lower Guide ASSY(Front)
PC22_ASSY
Tools Needed: Magnetic Philips Screwdriver (No.2)
#56 Reflection Sensor（PC21）
#56 Reflection Sensor
（PC31）
#33 PC22_ASSY
（PC22）
Cover(PC22L)K
#56 Reflection Sensor
（PC31）
#104 Cover
#33 PC22_ASSY
REV0 10.02.15
countersunk screw
#56 Reflection Sensor
（PC21）
countersunk screw
#54 Sensor (Emission)
（PC20）
Lower Guide ASSY(Back)
-H8-33-