GE Giraffe OmniBed Carestation CS1, Service Manual

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Chapter 5: Troubleshooting
Servo Controlled Oxygen
Service Manual 5-15
pins in the cable. Because it is difficult to remove and measure the cable without possibly changing the
resistance, it is suggested that you keep a spare 50 pin ribbon cable to use as a troubleshooting tool.
5.3.6 Troubleshooting the Toroidal Transformer
Perform the following tests in service mode. The referenced voltages should always be present when the
device is in service Mode. In normal operating mode, the voltages are not present if safety relay 2 contacts
are open.
1. Check the output voltage of the toroidal transformer at J44 pins 1-2 and at J44 pins 3-4. Voltages
should be about 15 volts AC.
2. If the voltage is not present verify that mains voltage is present at the primary input to the toroidal
transformer in service Mode. This voltage can be measured at relay board connector J51 pins 1-2. It
can also be measured at the configuration plug on the toroidal transformer pins 1-4.
3. If the primary voltage is present and there is no output voltage, the toroidal transformer is defective.
4. If the primary voltage is not present, then replace the relay board.
5.4 Servo Controlled Oxygen
5.4.1 Status
Access the Status screen from the main service menu. See “Accessing Service Mode” on page 4-1.
The Servo O2 screen provides status information about Oxygen as well as the mechanism to calculate
oxygen.