NEC NP-NC900C-A Service Manual page 81

KEY PART REPLACEMENT (Method of disassembly/Photo taken from life)
1-26 Horizonal & Vertical Sensor Board & Lightpipe
Loosen 4 screws on Horizonal & Vertical sens or board and unplug the 2 pcs connectors.
And, take them off. Torque: 5~6 kgf-cm.
Loosen 2 screws on lightpipe (Torque: 7~8 kgf-cm.). And, loosen 2 screws on lightpipe
bracket (Torque: 5~6 kgf-cm.).
"Confidential, Do Not Duplicate without written authorization from NEC."
5-30