Power Supplies; Switches/Thermostat - GE Giraffe Service Manual

Chapter 4: Troubleshooting

4.6.3 Power Supplies

The 5V and 12V supplies are generated on the power supply. +5STBY is generated on the relay board. These
voltages are distributed to the control board, display driver board, servo oxygen board, and expansion slots
through a harness with a series of 4 pin connectors. The easiest place to measure the power supplies is at one
of the spare 4 pin connectors on this power bus.
Signal
+5V
+5VSTBY
+12V
The 5VSTBY should also be present during power fail.
+5VAN and -5VAN are generated on the control board and are only used on the control board. They can be
measured on the test points on the control board.
Signal
+5V
+5VSTBY
+5AN
-5AN

4.6.4 Switches/Thermostat

Use switch status diagram on the second service screen to assist in troubleshooting the switches.
Humidity reservoir
Add water thermostat
Elevating base
Left or right up
Left or right down
54
Location
J42 pins 1-2
J42 pins 1-4
J42 pins 1-3
Location
TP2 pins 1-4
TP2 pins 3-4
TP1 pins 5-6
TP1 pins 4-6
Relay bd J32 pins 2-3
Relay bd J32 pins 1-3
Relay bd J40 pins 2-4
Relay bd J40 pins 1-4
6600-0356-000 103
Wire Color
Orange and blue
Orange and green
Orange and red
Value
4.75 to 5.25
4.75 to 5.25
4.75 to 5.25
-4.0 to -5.5
Closed when reservoir is closed
Opens when reservoir needs water
Closed when either switch is
pressed
Closed when either switch is
pressed
© 2001 by Datex-Ohmeda, Inc.. All rights reserved.
Value
4.75 to 5.25
4.75 to 5.25
10.8 to 13.2