Cisco Gigabit Switch Router Cisco 12012 Інструкція із заміни Посібник із заміни - Сторінка 13

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Before proceeding to the next step, verify that the source DC circuit breaker servicing the

Caution

DC power supply you are removing is in the OFF position. Also verify that the power switch on the

DC-input power supply is OFF (O). As an additional check, measure the voltages across the leads

attached to the power supply you have removed. All readings should be zero volts.

Remove the outer nut and washer from each terminal and disconnect the source DC

Step 9

power cable leads from the power supply lugs in the following order: negative (–),

positive (+), and ground. (Refer to Figure 8.)

Figure 8

Disconnecting the DC-Input Power Supply

Circuit breaker

alarm terminal

block

Pull the DC power cable leads down through the power supply handle and set the power

Step 10

cable aside.

As an added precaution, we strongly recommend that you place tape over the exposed

Caution

metal terminals on the power cable to prevent accidental contact between the leads or the leads and

ground.

If leads are attached to the power supply circuit breaker external alarm terminal block,

Step 11

record on a piece of paper which terminals the leads are attached to for later connection.

Disconnect the leads attached to the circuit breaker alarm terminal block. (Some sites

Step 12

might not have an external alarm system for the power supply circuit breaker.)

Cisco 12012 Gigabit Switch Router DC-Input Power Supply Replacement Instructions

–

Ground

Source DC

power cable

Removing and Replacing a DC-Input Power Supply