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DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-229CABINET (Cabinet Sensors)
10
1. Refer to Chapter 5, "Routine Maintenance Procedures", for details on
removing power from the system.
2. Remove the fan assembly cover by pulling the cover outward.
3. Loosen and remove the retaining screw nearest the power plug on the
front fan located to the extreme left.
4. Disconnect the power plug from the fan.
5. Loosen and remove the other retaining screw on the fan.
6. Remove the fan from the fan assembly.
!
CAUTION:
DO NOT TOUCH! Resistors on the circuit pack are hot.
7. Lift the latch on the AHD1 fan speed controller circuit pack.
8. Using the latch as a handle, pull the circuit pack up and out of its holder.
9. Insert a replacement AHD1 circuit pack, and push down on the latch until
the latch snaps in place.
10. Position the fan, and reconnect the fan power plug.
11. Insert and tighten the retaining screws.
12. Replace the fan assembly cover.
13. Refer to Chapter 5, "Routine Maintenance Procedures", for details on
restoring power to the switch.
Fan Replacement Procedure
NOTE:
The procedures in this section pertain to both non-variable speed
(standard) fans and variable speed fans.
First, determine which fans are defective:
NOTE:
The following instructions are for servicing a Medium Cabinet. For a Small
Cabinet (only two fans in the rear), follow Step 2A below, but start from the
rear of the cabinet.
1. If any fan is not rotating, a more detailed inspection is required to
determine why the fan has stopped operating. The fact that a fan is not
spinning is not always proof that it is damaged. Since each front fan is
electrically in parallel with a rear fan, an internal short circuit in a front fan
prevents power from reaching the rear fan (and vice versa).
Remove the fan assembly cover by pulling the cover outward. Remove the
power connector from each inoperative front fan.