Component Removal and Installation 73
Power Supply Removal
There are two ways to check a power supply failure:
• Use QuickManager
• Check the LED on the power supply’s printed circuit board. An unlit LED indicates that the power supply has
failed.
• Wear a grounding strap while performing the following procedure to prevent electrical
discharge.
• Avoid touching the fan during the following procedure since the fan blade could cause
harm.
1. If dual power supplies are installed in the unit, determine which power supply is malfunctioning. Because dual
power supplies feature a load redundant hot swap scheme, the malfunctioning power supply can be removed
without powering down the unit.
If the T1 Modem Bank has only one power supply installed, use the ON/OFF switch at the back
of the T1 Modem Bank to power-down before removing the power supply.
2. Loosen the two captive screws on the display panel faceplate; carefully pull down the hinged display panel
faceplate to access the power supply (or supplies).
When handling the power supply printed circuit board, do not touch the edge connector that
connects to the distribution board because damage to the board may result.
3. Pull out the malfunctioning power supply from the chassis.
4. See “T1 Modem Bank Power Supply Installation/Replacement” on page 8 for instructions on
installing/replacing a power supply.