ADCP-75-210 • Issue 1 • March 2007
Page 70
© 2007, ADC Telecommunications, Inc.
5 MAINTENANCE PROCEDURES
This section provides procedures for completing various maintenance tasks at the RAN. Refer
to the procedures in this section as necessary when scheduled maintenance is required. For fault
and troubleshooting procedures, refer to the system operation and maintenance manual, ADCP-
75-209.
5.1 cPCI Fan Replacement Procedure
The RAN chassis is equipped with a cooling fan that exhausts heated air from the chassis
assembly. Cool air enters the cPCI chassis through vent openings on the front door of the
cabinet. The recommended replacement interval is 60 months.
Use the following procedure to remove and replace the cPCI cooling fan.
1. Loosen the two thumbscrews that secure the fan access panel front door.
2. Open the hinged door (it swings down) to access the fan compartment.
3. Slide out the fan being replaced, note how it is connected, and then disconnect the fan.
4. Connect the new fan like the previous fan and slide it into the fan compartment.
5. Verify that the fan is running properly.
6. Close the fan panel door and secure it with the thumbscrews.
5.2 Cleaning or Replacing an Air Inlet Filter
The RAN cabinet air filter cleans the intake air before it enters the cabinets. The filter should be
cleaned approximately once per year and more often in extremely dirty environments. If the
cabinet temperature gradually rises over a long period of time and there are no fan failures, it is
possible that the filter is dirty and requires cleaning. Use the following procedure to clean the
cabinet air filter:
1. Open the RAN enclosure door and remove the inlet air filter tray door as shown in
Figure 49.
2. Pull the filter and away from its mounting slot at the bottom of the cabinet.
3. Gently tap the filter against your hand to dislodge the dirt. If necessary, use compressed air
or a vacuum cleaner to remove the dirt.
4. Carefully inspect the filter for holes or tears and replace if it is damaged.
5. Orient the filter with the airflow arrows pointed inside the RAN.
6. Close and secure the inlet air filter tray.
