Use the following procedure to replace cooling fan:
1. Carefully move any cables away from the rear of the power supply that may be blocking fan.
2. Loosen the two thumbscrews that secure the fan assembly to the power supply module. See Figure 28.
3. Carefully withdraw fan assembly from power supply module until the wiring harness is exposed and connector is
accessible.
4. Depress latch release on the fan connector and unplug the connector from the connector on the wiring harness.
5. Plug new fan connector into the wiring harness connector.
6. Carefully push fan wiring and connector back into the power supply module making certain no to pinch or break the
fan wires.
7. Position fan assembly in the module and tighten thumbscrews.
8. If a fan failure caused the power supply to overheat and shut down, the power supply input voltage must be cycled.
For DC primary powered systems, remove the primary fuse feeding the SignalOn chassis from the BDFB fuse panel
and reinsert. For AC primary powered systems, remove and replace AC power cord connection from AC socket
located on the rear of the power supply.
9. Verify that the power supply starts, LED status for input and output voltage and fan are green, and that the fan is
operating properly.
10. Verify that all active modules located in the chassis are powered up and operational.
11. Re-tie any cables moved away from rear of the power supply module.
5-2
SignalOn
®
Series – Forward Path Amplifier Products – Installation & Operation Manual
CCHAPTER 5: MAINTENANCE
POWER
SUPPLY
MODULE
WIRING
HARNESS
FAN
ASSEMBLY
THUMBSCREWS
FAN
CONNECTOR
LATCH
Figure #8: Power Supply Fan Replacement
