Service manual

Service Manual Repair Procedures 87
Replacing the MSP/SpO
2
Circuit Boards
This describes how to replace the MSP/SpO
2
circuit boards in the expansion module with
a CO
2
option. To replace SpO
2
boards in the SpO
2
module and the expansion module
without a CO
2
option installed, see “Replacing the SpO2 Circuit Boards” on page 86.
1. Open the expansion module (“Opening the Expansion Module Rear Panel” on
page 79).
2. Unplug the flex-cable connector J5 from the MSP board, but do not attempt to
remove the mainstream CO
2
connector side panel.
3. Disconnect the speaker cable from the MSP board and remove the speaker side
panel.
4. Remove the three screws securing the MSP board and SpO
2
board to the rear panel
(see the figure above).
5. Lift out the two circuit boards and SpO
2
patient connector side panel as a unit. (The
side panel easily slides out.)
6. Using equal pressure on both sides of the connector, disconnect the patient
connector side panel connector from the SpO
2
circuit board.
7. Disconnect the two circuit boards by gently pulling them apart.
When installing the MSP/SpO
2
circuit boards:
• plug the two circuit boards together
• connect the patient connector side panel connector to the SpO
2
circuit board
Caution When replacing the MSP/SpO
2
circuit boards, remove both circuit
boards with the patient connector side panel still connected. Attempting to
disconnect the patient connector side panel from the SpO
2
circuit board before
removing both circuit boards with the side panel can damage the flex-cable
between the side panel and the SpO
2
circuit board.
Caution In the next step, the connector securing clips are fragile and will break
if not handled carefully.
Flexible
Connector J5
Speaker
Cable