Bed Heater Failure" Alarm; Bed Up/Down Pedal Failure" Alarm - GE Giraffe Service Manual
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Chapter 4: Troubleshooting
4.3.7 "Bed Heater Failure" Alarm
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.
34
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.
6600-0356-000 103
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 4.6.8. To determine if a switch is
defective or the wiring has a short:
•
If the shroud assembly is in two pieces, raise the
lower shroud and check continuity at the switch
connectors.
•
If the shroud assembly is in three pieces, take off
the back cover, disconnect the lower shroud from
the base plate, lean the shroud forward to access
the switches, and check continuity at the switch
connectors. Check connections before reassembling.
If the alarm persists, replace the relay board.
© 2001 by Datex-Ohmeda, Inc.. All rights reserved.
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Troubleshooting
