Service manual

Service Manual Disassembly and repair 45
SpO
2
circuit board disassembly
Follow all the previous steps and then:
Masimo board
1. Remove the copper tape and unfold the shielding. This exposes the two screws that
hold the PCB to the standoffs.
2. Remove the two phillips head screws and lift the Masimo adapter board straight up.
There are four connectors on this board - two connect to the main PCB and the other
two connect to the Masimo PCB.
3. Unfold the paper to expose the SpO
2
board and remove the two screws holding the
board.
Note
To assure proper SpO
2
operation, replace the SpO
2
board using only the Welch
Allyn specified part.
To assure patient electrical isolation, after the main board is nearly back in
position, verify that the SpO
2
flex cable is freely floating and not pressed up
against the main board.
Phillips screws
Copper shield tape