System Failure 19; System Failure 20; System Failure 22 - GE Giraffe Service Manual

Chapter 4: Troubleshooting

4.4.16 System Failure 19

System failure 19 indicates: No Audio Frequency.
Cause(s)
Defective battery
Defective scale.
Defective scale
harness.
Defective Servo Oxygen
board.
Defective Servo Oxygen
cable.
Defective audio circuit
on control board.
Defective control board Replace the control board.

4.4.17 System Failure 20

System failure 20 indicates: Display WDOG Time Out.
Cause(s)
Display driver board software is not performing correctly.

4.4.18 System Failure 22

System failure 21 indicates: During operation, the incubator heater will not turn ON.
Cause(s)
Refer to other errors.
Error reading
distorted line signal.
44
Action(s)
Battery is only used for power fail. Try powering up the unit with the battery
disconnected. If the error clears, replace the battery.
Disconnect scale connector at probe panel. Power cycle the unit. If the error clears,
replace the scale.
Disconnect scale harness from J7 on the control board. Power cycle the unit. If the
error clears, replace the scale harness.
Disconnect the RS485 harness from J8 on the Servo Oxygen board. Power cycle the
unit. If the error clears, replace the Servo Oxygen Board.
Disconnect RS485 bus cable from J6 on the control board. Power cycle the unit. If
the error clears, replace the RS485 cable going to the Servo Oxygen board.
Replace socketed IC U22 on control board. If failure persists, replace the control
board.
Action(s)
Power down the unit. During the system tests after power-up the unit should detect
system failure 15 or bed heater failure. Follow the instructions in this manual for
those failures. Follow the instructions for system failure 15 in section 4.4.13 or for bed
heater failure in section 4.3.7.
Check the revision of the relay board. The revision code is located in a triangle printed
on the component side of the PCB. Refer to relay board Figure 6-34 (revision 10 or
higher) and Figure 6-35 (revision 9 or lower). If the relay board is revision 10 or lower,
replace with revision 13 or higher relay board.
If you have replaced the relay board with revision 13 or higher and you still have an
intermittent problem, follow the instructions for system failure 15 in section 4.4.13.
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Action(s)
Replace the display driver board.
© 2001 by Datex-Ohmeda, Inc.. All rights reserved.