4.3.7 “Bed Heater Failure” Alarm
Cause or Circumstances Failure Action
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.
The bed safety thermostat
is open (possibly because
the unit was shut down
when the heater was hot).
If the unit was shut o 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 .
Defective incubator
heater, thermostat, or
wire harness.
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.
Defective incubator solid
state relay (SSR).
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.
Defective 50 pin ribbon
cable between the relay
and control board.
Check for continuity on pins 36, 38, 39, and 40
(control signals). If defective, replace cable. If OK,
continue.
Defective relay board. Replace the relay board.
4.3.8 “Bed Up/Down Pedal Failure” Alarm
Cause or Circumstances Failure Action
One of the bed up/down
pedal switches is shorted.
Defective bed up/down
pedal switch or harness.
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 o
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.
Defective relay board. Defective relay board. If the alarm persists, replace the relay board.
34 6600-0356-000 103 © 2001 by Datex-Ohmeda, Inc.. All rights reserved.
Chapter 4: Troubleshooting
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