Table 12: Troubleshooting guide (continued)
Problem
Possible cause
Possible solution(s)
Several units do not flash
At the first equipment that fails: the power supply is
not within tolerances.
See problem 'System does not flash' and cause 'The
power supply is not within tolerances'.
At the first equipment that fails: the fuses or not
present or not intact:
Replace the fuses.
At the first equipment that fails: the equipment is not
operational:
Examine the input supply voltage.
Examine the equipment for damaged parts and replace
the parts if necessary.
At the first equipment that fails: the local bus
communication does not run.
Examine the activity of the local bus communication in
the LEDs (Rx local bus and Tx local bus) of the FCU PCB
in the equipment cabinet.
Examine the internal local bus cables.
Examine the external local bus cables.
Examine the local bus connection board PCB..
Examine if any broken parts have an unwanted effect
on the local bus cables.
At the first failing control unit: the flashing request is
not executed.
See problem 'System does not flash' and cause 'The
flashing request is not executed'.
At the first failing control unit: the dip-switches of dip-
switch banks SW1 and SW2 of the FCU PCB are not
correct.
Adjust the setting of the dip- switches.
UM-4019_AM02-620e, Rev. 3.0, 2020/05/12
57
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Summary of Contents for FCU-1-in-1
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