Appendix A Replacing hardware 49
Passport 8250 board guidelines
Use caution when handling, storing, and transporting circuit boards. Follow these guidelines:
•Do not stack or store boards without first replacing them in their antistatic material and shipping material.
•Do not to damage any parts when inserting the boards into packages.
•Do not store boards in areas where the relative humidity can exceed 85 percent or temperature can exceed 70 C.
•Handle boards by the faceplate. Do not touch electrical connections, pins, and soldered surfaces.
•Do not handle boards unless you are using appropriate antistatic protections such as an antistatic wrist strap. It is recommended that you use conductive carpet, conductive shoes, or heel grounders.
Replacing the fan module
If the fan module malfunctions, contact your Nortel Networks representative to order a new fan module.
WARNING
Rotating fan
Do not touch the fans immediately after removing the fan tray. The fans may continue to rotate several seconds after being removed.
1For each power supply module, turn the power supply breaker to off.
Breaker is off
2Loosen the two securing screws on the fan module.
3Slide the fan tray out of the fan module slot.
Passport 8250 Installation Guide R2.2
