Replacing the Power Supply Fuse
The rack chassis power supply uses a 400mA fuse for 120V AC
circuits, and a 200mA fuse for 240V AC circuits. The fuse compartment
is located just below the AC socket on the rear card. To replace the
fuse, follow these steps:
1.
Using a small screwdriver, pop the compartment open: It will slide
open like a drawer. Depending upon the exact part used, the
drawer may slide completely out of the fuse holder or it may stop
partway out.
2.
Note that there are
two fuses in the drawer: The front fuse is the
spare, the rear fuse is the “active” fuse.
3.
If the active fuse appears to be blown, remove it from the clips and
replace it with the spare from the front compartment. Note the size
and rating of the blown fuse before discarding.
4.
Using the part number found in Appendix C, order a new
replacement fuse.
Warning: For continued protection against the risk of fire, replace
only with the same type and rating of fuse.
Switching the Power Supply Between 120 and 240 Volts
Although the Model 1000R16P is shipped from the factory with a
customer-specified power supply configuration, you may change the
configuration yourself. Here are the steps to switch the configuration of
the power supply between 120V and 240V AC:
1. Remove the front power supply card and locate the two position
switch near the back of the card. Slide the switch to the desired
voltage (Note: The actual values on the switch may be “110/220” or
“115/230”).
2. Replace the existing fuse with one of the correct value (see
Appendix C for the appropriate fuse).
3.
Replace the power supply cord, if necessary (see Appendix C for
the appropriate power cord).
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4.0 INSTALLATION
This section describes the functions of the Model 1000R16P rack
chassis, tells how to install front and rear Model 1000CC cards into the
chassis and provides diagrams for wiring up the interface connections
correctly.
4.1 THE MODEL 1000R16P RACK CHASSIS
The Model 1000R16P Rack Chassis (Figure 3, below) has sixteen
short range modem card slots, plus its own power supply. Measuring
only 3.5” high, the Model 1000R16P is designed to occupy only 2U in a
19” rack. Sturdy front handles allow the Model 1000R16P to be
extracted and transported conveniently.
4.1.1 THE RACK POWER SUPPLY
The power supply included in the Model 1000R16P rack uses the
same mid-plane architecture as the modem cards. The front card of
the power supply slides in from the front, and the rear card slides in
from the rear. They plug into one another in the middle of the rack.
The front card is then secured by thumb screws and the rear card by
conventional metal screws.
Switching the Power Supply On and Off
The power switch is located on the front panel. When plugged in
and switched on, a red front panel LED will glow. Since the Model
1000R16P is a “hot swappable” rack,
it is not necessary for any cards
to be installed before switching on the power supply. The power supply
may be switched off at any time without harming the installed cards.
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Figure 3. Model 1000R16P Rack Chassis with power supply
