GE Giraffe OmniBed Carestation CS1, Service Manual

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Chapter 6: Alarms and System Failure Codes
System Failure Codes
Service Manual 6-17
No output from heater
isolation transformer.
Defective relay board. In service Mode, check the output voltage of the heater isolation
transformer at the one pin connectors on the black and white wires on the
transformer secondary. This secondary voltage should always read 115
volts.
•
If 115 volts is present, then replace the relay board.
• If 115 volts is not present, check that the mains voltage is input to the
transformer primaries.
• Be sure J49 on the relay board is properly connected.
• Verify the configuration plug on the transformer primary is seated
properly.
To measure primary input voltage on 115 volt devices:
•
Verify mains voltage is present at pins 2-5 (brown and orange wires)
on the transformer primary configuration plug.
• Verify mains voltage is present at pins 3-6 (yellow and blue wires) on
the transformer primary configuration plug
To measure primary input voltage on 230 volt devices:
•
Verify mains voltage is present at pins 2-6 (brown and blue wires) on
the transformer primary configuration plug.
• If voltages are not present, verify mains voltage is present at pins 1-4
(black and red wires) on the transformer primary configuration plug.
• If not, replace the relay board.
Defective heater isolation
transformer. If voltage is present at primaries but no voltage output at secondaries,
replace the heater isolation transformer.
Defective DAC circuit on
control board If failure persists, replace control board. After replacing the control board,
set it to incubator mode and restart the device.
Defective solid state relay
(SSR) Power up the device in service Mode. Run status test on the second
service screen and verify that the I/WHTROFF (incubator/warmer heater
off) test fails. If the status test fails, then it is an SSR problem. If the status
test does not fail, then try the recommended action for a defective current
sense circuit on relay board, below.
To determine which SSR is shorted, disconnect an output wire from them
one at a time and rerun the status rest.
Defective radiant heater
SSR Disconnect the black wire (larger diameter) from the AC side of the radiant
heater solid state relay. Run status test. If I/WHTROFF test passes replace
the radiant heater SSR. If it still fails reconnect the wire to the SSR.
Defective incubator heater
SSR Disconnect the black wire (larger diameter) from the AC side of the
incubator heater solid state relay. Run status test. If I/WHTROFF test
passes replace the incubator heater SSR. If it still fails reconnect the wire
to the SSR.
Defective current sense
circuit on relay board Replace relay board.
Defective 50-pin ribbon
cable If failure persists, replace 50-pin ribbon cable.
Cause(s) Action(s)