3025EMC Master Control Switching & Channel Branding
Page 8 Revision 3.0.3
The fuse holder is located inside the power entry module. To change the fuses, disconnect the line
cord from the power entry module and pull the fuse holder out from the power entry module using a
small screwdriver. The fuse holder contains two fuses, one for the line and one for the neutral side of
the mains connection. Pull out the blown fuse and place a fuse of the correct value in its place.
For 100-120 VAC operation, use ceramic time delay 5 x 20 mm fuses rated for 250 Volts with a 10
amps current rating. For 220-240 VAC operation use ceramic time delay 5 x 20 mm fuses rated for
250 Volts with a 6.3 amps current rating.
For your convenience there are spare fuses located in the vinyl pouch in the front of this manual.
Carefully reinsert the fuse holder into the power entry module.
2.5.2. Replacing the Power Supply
Each power supply is a complete assembly, and includes the power supply cooling fan and one frame-
cooling fan. In the event that the power supply or one of the fans malfunctions, you will need to
replace the power supply assembly with a spare one while the failed assembly is being repaired.
CAUTION: Do not run the frame for ex
tended periods of time with one of the
power supplies removed. Proper cooling of the frame requires both power
supplies to be inserted into the frame, or one power supply and a power supply
blank panel.
The 3000PS, 3000PS-QT and 7800PS-QT power supplies are hot swappable and can be easily
replaced from the front without interrupting the signal integrity of the frame. Each power supply is
capable of supplying full power to the frame by itself, however we recommend running with both
supplies powered for power redundancy. On frames with only one power supply, a 3000PS-FM blank
power supply module with cooling fan must be inserted into the second power supply space. The
3000PS-FM contains a module-cooling fan and baffles to maintain proper airflow within the frame.
The power supply is secured into the frame by two machine screws through the rear panel (as shown
in Figure 2-1). These screws must be removed before the power supply can be extracted from the
front.
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