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

Chapter 4: Troubleshooting

4.6.7 Incubator Heat Sink Sensor Thermistor

Use the service screen to read the resistance of the heat sink sensor.
Thermistor
Temperature (C)
20
25
30
35
40
80
90
100
110
120

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.
Control Signals, Relay Board
Switch J37 pin 23
24V SELECT
Raise E-base 0
Lower E-base 0
None 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 specific pins in the
cable. Because it is difficult 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
Control bd J3 pins 1-2
Resistance (Ohms)
25000
20000
16102
13048
10636
2506
1827
1353
1017
775
J37 pin 26 J37 pin 24
E/H ACTIVATE NVERTPOLARITY E/H SELECT
0 1
0 0
1 NA
6600-0356-000 103
J37 pin 27
0
0
NA
© 2001 by Datex-Ohmeda, Inc.. All rights reserved.
E-base
J45-1 J45-2
+24V Gnd
Gnd +24V
NA NA