Service manual

Service Manual Disassembly and repair 47

Nellcor board

Follow all the previous steps and then:

1. Remove the three phillips head screws along with the nuts and spacers from the

SpO

PCB.

2. Remove the SpO

module (Nellcor MP205) from the main PCB.

Note

If a failure occurs in the MP205 PCB (obsolete), update to a Nell-3 PCB (704870)

and update the Main PCB (403290). The new Main PCB (403290) correctly

operates an MP205, an MP506, or a Nell-3 PCB. If the Nell-3 is used with the old

main PCB, an E7 error occurs after connecting the power.

For MP205 PCB: Verify the following:

• There are two shunts at the top of the jumper row on the PCB before

installing on the Main PCB.

• The two locking tabs on the connectors of the Nellcor MP205 PCB are broken

off before installing onto the Main PCB.

• The nylon washers are located on the main PCB when reassembling the

SpO

PCB to the Main PCB.

For MP506 or Nell-3 PCB: Verify the following:

• The DIP switch positions are (1-on, 2-on, 3-off and 4-off) on the new PCB and

the two locking tabs on the connectors of the Nellcor MP506 PCB are broken

off before installing onto the Main PCB.

• Verify that the nylon washers are located on the main PCB when

reassembling the SpO

PCB to the Main PCB.

Phillips screws

Spacers (3 places)