NEC NP-NC900C-A Service Manual page 71

KEY PART REPLACEMENT (Method of disassembly/Photo taken from life)
1-17 ICP Board
Put control module on the desk to strip down.
Unplug 6 pcs cables from control module. Loosen 2 screws on third level of control module
and take it off. Torque: 1.25~1.75 kgf-cm.
Loosen 2 screws on second level of control module and take it off. Torque: 1.25~1.75 kgf-cm.
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5-20