7. MAINTENANCE
Symptom Possible Cause Solution
Does not recognize
the memory card
Bad connection or
not mounted.
Verify if the memory card is properly connected in the
compartment.
Verify if the memory card was put in the right side, as
indicated on the CPU frontal panel.
Verify if the memory card wasn’t unmounted through MS
button, placed on the frontal panel, visualizing the indi-
cation on the CPU graphic display.
Table 247: Troubleshooting
7.8. Preventive Maintenance
It must be verified, each year, if the interconnection cables are connected firmly, without dust accumulation, mainly the
protection devices.
In environments subjected to excessive contamination, the equipment must be periodically cleaned from dust, debris,
etc.
The TVS diodes used for transient protection caused by atmospheric discharges must be periodically inspected, as they
might be damaged or destroyed in case the absorbed energy is above limit. In many cases, the failure may not be visual.
In critical applications, is recommendable the periodic replacement of the TVS diodes, even if they do not show visual
signals of failure.
Bus tightness and cleanness every six months.
For further information, see Nexto Series Manual - MU214600.
376
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