Cisco 3745 Installationsanleitung Seite 13

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13
Installing Field-Replaceable Units in Cisco 3745 Routers
78-14308-02
Replacing Cisco 3745 Chassis Power Supplies
Removing a Cisco 3745 Chassis Power Supply
To remove a chassis power supply, perform the following steps:
Step 1 Turn off power to the power supply to be removed.
Warning
Before opening the unit, disconnect the telephone-network cables to avoid contact with
telephone-network voltages. To see translations of thewarnings that appear in thispublication, refer
to the
Regulatory Compliance and Safety Information
document that accompanied this device.
Step 2 Remove all network interface cables from the rear panel.
Warning
When installing the unit, always make the ground connection first and disconnect it last. To see
translations of the warnings that appear in this publication, refer to the
Regulatory Compliance and
Safety Information
document that accompanied this device.
Step 3 Disconnect the power cables from the terminal block as follows:
a. Lift and remove the plastic cover from the terminal block.
b. Use a screwdriver to remove the three power leads from the terminal block, in this order:
(1) negative, (2) positive, (3) ground.
Step 4 The power supply is held in the chassis by two external mounting screws at the rear of the router. (See
Figure 5.) Remove the screws and set them aside.
Figure 5 Removing the Power Supply Mounting Screws
Step 5 Place the router so that the front panel is facing toward you. Loosen the two fan tray retaining screws
located inside the access door. (See Figure 6.)
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