Specifications

114 Chapter 9
XMU+ Hardware Upgrades
Replacing the XMU+ Large Chassis Power Supply
Removal of the Power Supply card from the XMU+ (large chassis only) may be
required:
 For some XMU+ repairs.
 To troubleshoot power supply failures.
 To change the power source (from AC to DC, or DC to AC).
 To add a secondary power supply (AC or DC).
Large chassis power supply cards should always be removed and/or installed by a
trained technician. Small chassis Power Supply cards are not field upgradable, and
must be returned to the factory for replacement.
Note: Since the AC power cord is the disconnect for the XMU+, ensure that the AC
receptacle is near the unit. See XMU+ Approvals on page 143 for more information.
Bitte beachten Sie die wichtien Sicherheits informationen auf Seite 135, XMU+
Technical Specifications and Approvals.
To remove a single Power Supply card
1. Take the XMU+ offline and power down. See To take the XMU+ offline on page
107 and To power dow n th e XMU+ on page 108.
2. Loosen the two thumbscrews on either end of the Power Supply card’s faceplate.
See “Connecting the XMU+ to its Power Supply” in Chapter 2 of the XMU+
Installation Handbook for a detailed diagram of the Power Supply card.
3. Pull the Power Supply card straight out.
To install a new single Power Supply card
1. Take the XMU+ offline and power down.
See To take the XMU+ offline on page 107 and To power dow n the XMU+ on
page 108.
2. Remove the old Power Supply card.
See To remove a single Power Supply card on page 114.
3. Line up the circuit board of the new Power Supply card on the plastic rails in
the chassis.
4. Slide the new Power Supply card into place.
When seating the card, there should be slight resistance.
5. Tighten the thumbscrews.
6. Bring the XMU+ back online. See To br ing the X MU+ online on page 108.
If the power supply card is properly installed and working, the LED indicator
will be green.
Caution...
Power supply
may contain
lethal voltage.
Caution...
Forcing the Power
Supply card into
place could bend
the pins on the
connector.