System Failure 26; System Failure 27; System Failure 28; System Failure 29 - GE Giraffe Service Manual

Chapter 4: Troubleshooting

4.4.21 System Failure 26

System failure 26 indicates: During the power up tests, the system was unable to turn off safety relay 1.
Cause(s)
Defective relay board.

4.4.22 System Failure 27

System failure 27 indicates: Defective non-volatile memory.
Cause(s)
Defective circuit on control board.

4.4.23 System Failure 28

System failure 28 indicates: During operation, the display driver board lost communication with control board.
Cause(s)
Refer to system
failure 0.
Defective flat ribbon
cable between
control board and
display board.

4.4.24 System Failure 29

System failure 29 indicates: Defective signal on control board.
Cause(s)
Defective control board
46
Action(s)
Power down the unit, during the self-test the unit should detect system failure 0.
Follow the instructions for system failure 0 in section 4.4.1.
If system failure 28 persists without system failure 0, replace the flat ribbon cable
between control board and display board.
6600-0356-000 103
Action(s)
Replace the relay board.
Action(s)
Replace the control board.
Action(s)
Replace the control board.
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