Table of Contents
4.5 Troubleshooting Symptoms
Symptom
Possible Cause
Defective speaker or harness.
No audio alarm.
Audio driver circuitry on
control board is defective.
Unit was powered on and the
compartment probe was not
Unit equipped with
plugged in at the probe panel
servo-humidity but
(only on old style units with
RH setpoint only
connector)
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.
Elevating base AND
Output voltage from the
Canopy will not go
toroidal transformer is OK.
up or down.
Defective fuse on relay board.
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 relay board.
© 2001 by Datex-Ohmeda, Inc.. All rights reserved.
Action
Use an ohmmeter to verify the speaker resistance is about 8
ohms at relay board connector J40, pins 5-6. If defective, raise
the lower shroud and measure at 6 pin connector to determine if
speaker or harness is defective.
Replace the control board.
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.
Try raising/lowering canopy using the hand switches. Check
Setup screen (wrench symbol) or service screen to see if pedal
switches are disabled.
Check the toroidal transformer. Refer to the Tips section (4.6.12).
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.
Replace relay board.
6600-0343-000 104
Chapter 4: Troubleshooting
55
Table of Contents
Troubleshooting
