Fan Replacement - ADC Digivance User Manual

Alarm Type
ALARM Indicator:
Problem
POSSIBLE CAUSE
1. Air intake or exhaust openings to RIU
chassis blocked.
2. Ambient temperature > 58º C/136º F.
3. Faulty fan.
4. Faulty RIU.
Alarm Type:
ALARM Indicator
Problem
POSSIBLE CAUSE
1. Faulty RIU.
Alarm Type
ALARM Indicator
Problem
POSSIBLE CAUSE
1. AC power source off or disconnected.
2. Faulty RIU

4.3 Fan Replacement

It is recommended that the fan (catalog number DGVI-200000FAN) be replaced every five years.
Replacement of a fan requires that the RIU be turned off for a short period of time. This will drop
all existing calls, cause a temporary loss of service, and generate a major alarm. Use the following
procedure to replace the RIU cooling fan:
1. Before touching the RIU or handling a fan, slip on an Electro-Static Discharge (ESD)
wrist strap and connect the ground wire to an earth ground source. Wear the ESD wrist
strap while completing each section of the fan installation procedure.
Warning: Electronic components can be damaged by static electrical discharge. To prevent
ESD damage, always wear an ESD wrist strap when working on the RIU and when handling
electronic components.
2. Notify the NOC or alarm monitoring system operator that the system is going offline.
3. Place the RIU AC power On/Off switch in the OFF position (press O) and disconnect the
AC power cord.
Caution: High voltage components are present within the RIU enclosure. Disconnect the AC
power cord from the AC power source before proceeding to step 4.
4. Remove the four flat-head screws (requires TORX screwdriver with T15 bit) that secure the
fan/grill assembly to the side of the enclosure as shown in Figure 15 and save for reuse.
Table 5. Fault Isolation and Troubleshooting
Minor
Yellow
The RIU is overheating.
Major
Red:
Over or undercurrent condition detected at power amplifier.
Major
Off
The RIU is not powered.
CORRECTIVE ACTION/COMMENTS
1. Remove cause of air-flow blockage.
2. Reduce ambient temperature.
3. Replace fan (see Section 4.3).
4. Replace RIU.
CORRECTIVE ACTION/COMMENTS
1. Replace RIU.
CORRECTIVE ACTION/COMMENTS
1. Restore AC power.
2. Replace RIU.
ADCP-75-114 • Issue 2C • January 2002
Page 21
© 2002, ADC Telecommunications, Inc.