GE Giraffe - Incubator Heat Sink Sensor Thermistor; Elevating Base Motor; Troubleshooting the 50 Pin Ribbon Cable

4.6.7 Incubator Heat Sink Sensor Thermistor
Use the service screen to read the resistance of the heat sink sensor.
Thermistor Control bd J3 pins 1-2
Temperature (C) Resistance (Ohms)
20 25000
25 20000
30 16102
35 13048
40 10636
80 2506
90 1827
100 1353
110 1017
120 775
4.6.8 Elevating Base Motor
If you must replace a footswitch when the bed is all the way down, use pedal screen on service screen to raise
or lower the bed.
The e-base is driven at 24 volts DC (acceptable range 24-32). The following chart shows the control signal
values and the output voltages for each of the motor conditions.
Switch
Control Signals, Relay Board
E-base
J37 pin 23 J37 pin 26 J37 pin 24 J37 pin 27
24V SELECT E/H ACTIVATE NVERTPOLARITY E/H SELECT J45-1 J45-2
Raise E-base 0 0 1 0 +24V Gnd
Lower E-base 0 0 0 0 Gnd +24V
None NA 1 NA NA NA NA
4.6.9 Troubleshooting the 50 Pin Ribbon Cable
All of the communication between the control and relay boards passes through the 50 pin ribbon cable. Many
of the troubleshooting procedures in this manual recommend that you verify continuity for specic pins in the
cable. Because it is dicult to remove and measure the cable without possibly changing the resistance, it is
suggested that you keep a spare 50 pin ribbon cable to use as a troubleshooting tool.
56 6600-0356-000 103 © 2001 by Datex-Ohmeda, Inc.. All rights reserved.
Chapter 4: Troubleshooting