Chapter 7: Repair Procedures
Servo Controlled Oxygen Service Procedures
7-62 Service Manual
7.18.3.2 Sensor Housing Repairs: Calibration Valve
1. Slide drawer to one side and remove three M4 screws that secure bottom cover to chassis.
2. Remove the humidifier reservoir by pulling forward from bottom. A sheet metal ground strap is located
behind the reservoir. Remove the M3 screw that secures the strap to the bottom cover. Slide drawer to
other side and remove remaining three M4 screws that secure bottom cover to chassis. Remove the
cover by sliding out toward the right side of the device.
3. Disconnect the ground cable from bottom cover. The ground cable is secured to a 4 mm stud in the
bottom cover with a nut and two internal tooth lock washers.
4. Disconnect the cooling fan cable.
5. Use a 2.5 mm hex key to remove the M3 screw that secures the center of the sensor housing to the
chassis. Refer to “Figure 7-55 Sensor Housing”.
6. Use a 10 mm nut driver to remove the two stand-off fasteners that secure the sensor housing to the
chassis.
7. Disconnect tubing from chassis and heat-sink vent fittings.
8. Disconnect all harnesses from sensor housing, and remove sensor housing from device.
9. Remove the two M4 flat head screws that secure the calibration valve to the sensor housing, and
remove calibration valve assembly.
10. Install new calibration valve assembly. Connect the black wire to the - terminal and the red to the +
terminal.
11. Perform the Pre-use Checkout and Leak Check.
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