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Maintaining the LightStream 1010 ATM Switch 4-21

Replacing the Chassis Fan Assembly

Caution If you are replacing the fan assembly while the unit is operating, make sure the

replacement fan assembly is ready to be installed immediately.

The chassis fan assembly draws cooling air in through the right side of the chassis and

exhausts it through the left side to cool the ASP and PAMs. The absence of cooling air can

cause the interior of the chassis to heat up and can cause an overtemperature condition.

Never operate the system if the fan assembly is not functioning properly.

The fan assembly is located at the left of the chassis card cage. (See Figure 4-14.) The fan

assembly is secured to the back panel with two captive installation screws.

Caution Never operate the system if the fan assembly is not functioning properly or if

one is not reinstalled quickly. An overtemperature condition can result in severe equipment

damage.

Figure 4-14 Chassis Fan Assembly

Power Supply 0

Power Supply 1

PS1

PS2

FAN

LINK

SLOT 2

SLOT 1

PCMCIA

EJECT

AUX

CONSOLE

Enet

RESET

H5603

Fan assembly

Captive

screws