GE Giraffe Service Manual page 78

Chapter 4: Troubleshooting
Symptom Possible Cause
Unit was powered on and
the compartment probe
Unit equipped
was not plugged in at the
with servo-
probe panel (only on old
humidity but RH
style units with connector)
setpoint only
shows 1-10. Defective humidity sensor
Defective control board.
Reservoir switch button is
jammed (only on units with
old style button).
ADD WATER
Defective reservoir switch.
message stays on
even after water
has been added. Defective 50 pin ribbon
cable between the relay
and control board.
Defective relay board.
Defective control board.
Pedal switches are disabled
on nurse setup screen or
service screen.
Defective toroidal
transformer
No mains input to the
toroidal transformer.
Output voltage from the
toroidal transformer is OK.
Elevating base
Defective fuse on relay
will not go up or
board.
down.
Defective 50 pin ribbon
cable between the relay
and control board.
Output voltage from the
toroidal transformer is OK.
Fuses on relay board are
OK. Defective elevating
base motor.
Defective relay board.
50
Action
Cycle power after compartment probe is plugged in.
Replace the humidity sensor.
If problem persists, replace control board.
Remove reservoir, but take care because surface may be
hot! Check that the white reservoir switch button moves
freely. If it is stuck in the closed position it should be
replaced with the new style. (6600-1298-500)
Check resistance of reservoir switch at relay board harness
J32, 2-3. Switch should be closed when reservoir is closed
and open when reservoir is open.
Check for continuity on pin 6 (RHBOTTLE). If defective,
replace cable.
Replace relay board.
Replace control board.
Check Setup screen (wrench symbol) or service screen to
see if pedal switches are disabled.
Check the toroidal transformer. Refer to the Tips section
4.6.10. Replace transformer if defective.
Replace relay board.
Check fuses F5, F6 on the relay board.
Check for continuity on pins 23, 24, 26, 27, 34 (motor
control and safety relay 2 control signals). If defective,
replace the cable.
Check the voltage to the elevating column motor. Refer to
the Tips section 4.6.8. If OK, replace the elevating column
assembly.
Replace relay board.
6600-0356-000 103
© 2001 by Datex-Ohmeda, Inc.. All rights reserved.