Chapter 10
189
UM10350_PCNC770_Manual_0916A
Troubleshooting
Controller Communications Subsystem Checklist
Table 3.1
Controller communication cannot be established
(Controller LED cannot be turned on)
Possible Cause Probability
Action to Identify Cause of Problem
Discussion
Control power is off
Medium Power on control power.
Refer to Control Power Subsystem
earlier in this chapter.
Ribbon cable J4
between bulkhead
connector and the
control board is
not plugged in
Medium
Check the connections on both ends
and ensure they are rmly seated.
The connection at the control
board has been known to
loosen up during shipping.
DB-25 cable is
not properly
connected
between controller
and mill
Medium
Check cable connections. Check cable
and connector (pins) for damage.
Swap out for new cable, if
possible.
Mill interface board
defective
Low Try a new mill interface board. —
Control board
defective
Low Swap boards
Likelihood of defective board
is slim.
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