SD39RIO-1 MAINTENANCE
January 2001
3-1
3.0 Maintenance
The Remote I/O Rack requires minimal maintenance. Some routine maintenance is recommended in the form
of a visual inspection and possible cleaning.
3.1 Visual Inspection
The Remote I/O Rack and installed I/O modules should be subjected to a periodic visual inspection. The
frequency of inspection will depend on the severity of the operating environment.
The primary aim of the inspection is to reveal any excessive accumulation of dust, dirt, or other foreign
material. Accumulation of dirt and dust prevents efficient heat dissipation and may cause system failure or
equipment breakdown.
3.2 Cleaning
Cleaning a Remote I/O R involves brushing or vacuuming to restore cooling efficiency that may have been
degraded by accumulated dust. Be careful not to disturb wiring and jumpers on associated hardware. The
fans should also be carefully cleaned. Cleaning of I/O modules and associated hardware is discussed in
module documentation.
3.3 Parts Replacement
Refer to Figures 1-1, 2-3, and 2-26 for major parts identification. When servicing a Remote I/O Rack, the
removal of installed I/O modules and their associated hardware is sometimes necessary, refer to the module
documentation for module removal and replacement procedures.
3.3.1 Fan Fuse Replacement
The fan fuse (P/N 7447-171) is a 1.5 A 250 Volt 5x20 mm type M fuse in a spring loaded fuse holder. A
small flat blade screwdriver is need to open/close the fuse holder.
To replace the fan fuse:
1. Locate the fan fuse holder on the left side of the Remote I/O Rack’s chassis (Figure 2-3).
2. Remove power to the fan at its external power supply.
3. Using a small flat blade screwdriver, remove the twist cap from the fuse holder and remove the fuse.
4. Replace the fuse and install the cap to the fuse holder.
5. Restore power to the fan assembly and check for fan proper operation.
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