Humidifier Heater/Safety Thermostat; Compartment Air Probe And Patient Probes - GE Giraffe Service Manual

The following switches are membrane switches. When closed the resistance should be less than 200 ohms.
Display Touch Panel Switches
Alarm Silence
>37 degrees
Servo Control
Up
Down
Intervention
Manual Mode Inc.

4.6.5 Humidifier Heater/Safety Thermostat

The humidifier has two separate heater elements rated at 225 watts at 104 volts. They are connected in
parallel for 115 volt operation and in series for 230 volt operation. The humidifier safety thermostat is in series
with the heater. It opens at 130 +/-5 C and closes at 90 +/-8 C. Measure the resistance at J53.1 to J53.3.
The resistance of each heater is about 144 ohms so it should measure about 72 ohms for 115 units, 288 ohms
for 230 units.

4.6.6 Compartment Air Probe and Patient Probes

Use the service screen to read the temperature of the compartment and patient probes. There are two
thermistors in each probe. During stable temperature conditions the thermistors should read the same
resistance within a few ohms.
Patient probe #1
Patient probe #2
Compartment probe
Temperature (C)
20
25
30
35
© 2001 by Datex-Ohmeda, Inc.. All rights reserved.
Display Driver bd J21 pins1-2
Display Driver bd J21 pins1-3
Display Driver bd J21 pins1-4
Display Driver bd J21 pins1-5
Display Driver bd J21 pins1-6
Display Driver bd J21 pins1-8
Display Driver bd J21 pins1-9
Control bd J4 pins 1-3, 2-3
Control bd J2 pins 1-3, 2-3
Control bd J1 pins 1-2, 3-4
Resistance (Ohms)
12527
10000
8037
6500
Chapter 4: Troubleshooting
Closed when switch is pressed
Closed when switch is pressed
Closed when switch is pressed
Closed when switch is pressed
Closed when switch is pressed
Closed when switch is pressed
Closed when switch is pressed
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