Mallinckrodt NELLCOR NPB-4000 Service Manual page 57

d) Disconnect large ribbon-cable connector from main PCB.
e) Unscrew NIBP tubing connector from pump to main PCB. Front and rear
case assemblies are now completely separable from one another.
Step B2
To remove SpO module, ECG/Temp connector assembly, and encoder
2
assembly:
• SpO
module: remove three screws located at corners of SpO
2
lift off ground wire and foil shield, pull SpO
disengage it from main PCB.
• ECG/Temp cable/connector assembly: unplug connector from Main
PCB, remove screws fastening ECG connector to front case, rotate
temperature connector counter-clockwise to unscrew it from fastening nut
on outside of front case.
• The encoder assembly: unplug connector from main PCB. Remove
knob, as described in step A1. Use 9/16" hex socket to unscrew fastening
nut on outside of front case. Encoder may be pulled away from front case.
Section 6: Disassembly Guide
Procedure
Illustration
SpO module
2
Procedure
module straight up to
2
module,
2
6-7