Bed Heater Failure" Alarm; Bed Up/Down Pedal Failure" Alarm; Bed Up/Down Pedal Switches Disabled" Alarm - GE Giraffe OmniBed Service Manual

Chapter 4: Troubleshooting

4.3.7 "Bed Heater Failure" Alarm

This alarm activates only when the canopy is at the bottom position.
Cause or Circumstances
The software has turned on
the incubator heater but it is
either not turning on or the
current sense circuit is not
detecting that it is on.

4.3.8 "Bed Up/Down Pedal Failure" Alarm

Cause or Circumstances
One of the bed up/down
pedal switches is shorted.
Defective relay board.

4.3.9 "Bed Up/Down Pedal Switches Disabled" Alarm

Cause or Circumstances
Bed up/down pedal switches
have been disabled in nurse
setup screen or service
screen and pedal is pressed.
36
Failure
The bed safety thermostat is
open (possibly because the
unit was shut down when the
heater was hot).
Defective incubator heater,
thermostat, or wire harness.
Defective incubator solid
state relay (SSR).
Defective 50 pin ribbon cable
between the relay and control
board.
Defective relay board.
Failure
Defective bed up/down pedal
switch or harness.
Defective relay board.
Failure
None
6600-0343-000 104
Action
If the unit was shut off when the heater was hot, allow
the fan to run for several minutes to cool to below 40
degrees C then power down and back up. If the failure
still persists, continue .
Check the resistance of the incubator heater. Refer
to the Tips section (4.6.2). If defective, remove the
chassis cover and measure resistance at thermostat
and heaters to determine if heater, thermostat, or wire
harness is defective.
In service mode, check the voltage across the control
line of the incubator heater SSR. This control signal
varies between 0 VDC and about 12 VDC.
If voltage is present replace SSR. The two SSRs are
identical and can be swapped for troubleshooting. If no
voltage, continue.
Check for continuity on pins 36, 38, 39, and 40 (control
signals). If defective, replace cable. If OK, continue.
Replace the relay board.
Action
Check the switches on the service screen to determine
which switch is shorted or open. Refer to the Tips
section (4.6.9). Raise the lower shroud and check
continuity at the switch connectors to determine if a
switch is defective or the wiring has a short.
If the alarm persists, replace the relay board.
Action
When pedal is released, the alarm deactivates.
NOTE: If the bed up/down pedal switches are disabled
in the service screen and you wish to use them, you can
reactivate them only in the service screen.
© 2001 by Datex-Ohmeda, Inc.. All rights reserved.