Service manual

44 Disassembly and repair Welch Allyn Spot Vital Signs
Main printed circuit board assembly
Follow all the previous steps and then:
1. Remove the pneumatic tubing from the transducer on the main PCB.
2. Remove the battery/valve cable connector from the bottom of the PCB.
3. Remove the 4 #10 Torx screws from the PCB.
4. Lift Main PCB from housing.
If the Spot Vital Signs uses SpO
2
then remove the three screws on the underside of
the Main PCB and lift the SpO
2
PCB off the main board (two main board connectors).
5. Attach the existing SpO
2
board to the new main board reusing all hardware.
Torx Screws
Battery/Valve
Connector
Pneumatic Tubing