Alarm Messages; Air Probe Failure" Alarm; Air Temp >38C" Or "Air Temp >40C" Alarm - GE Giraffe Service Manual

Chapter 4: Troubleshooting
Item Description
5V Power supply voltage. Should be + 0.25V of 5V
VR Voltage reference. Independent voltage reference. Should be 1.235V + 1%
DV DAC output voltage. It should match the DAC volt value within 10 mV.
BV Used for manufacturing only, not for service use.
Across the bottom of the screen the date of last time the temperature and line voltage calibration was
performed appears plus the current time settings of the unit.

4.3 Alarm Messages

This section describes the alarm messages that may appear for the Giraffe Incubator. The alarms have been
organized in this section alphabetically.

4.3.1 "Air Probe Failure" Alarm

Cause or Circumstances
The software detected a
difference in the two air
thermistors of > 0.5C
Defective control board.
4.3.2 "Air Temp >38C" or "Air Temp >40C" Alarm
Cause or Circumstances
Air Temp >38C or Air Temp
>40C alarm activated even
though compartment temp
is < alarm temp.
This alarm does not self
reset after alarm condition
is resolved.
32
Failure
Defective compartment
air probe or harness
Failure
None
6600-0356-000 103
Action
Measure the resistance of the two sensors at the
harness from control board J1, Pins 1-2, and 3-4.
Under stable conditions, the resistances should be
within about 100 ohms. If defective, disassemble
the air probe assembly and disconnect the 5 pin
connector inside. Measure resistance of the two
thermistors at pins 1-2 and 3-4 to determine if the
sensor or harness is defective. Refer to the Tips
section 4.6.6 for resistance values.
If the thermistors and harness measure OK, replace
the control board.
Action
Push the alarm silence button to clear the alarm.
© 2001 by Datex-Ohmeda, Inc.. All rights reserved.