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installation. Two expansion cabinets can be
installed.
Remove and retain the four screws securing
the basic cabinet top cover and lift the cover
off the cabinet (Figure 4-l 1).
Remove and retain the two screws securing
each of the expansion cabinet side panels.
Pull the side panels off.
Place the four casters on the basic cabinet in
the lock position to ensure cabinet stability
during the expansion cabinet installation.
On both the basic and expansion cabinets,
remove and retain two screws securing the
cabinets' doors. Remove and retain the six
screws securing the rear panel on each cabi-
net.
Place the expansion cabinet on top of the
basic cabinet, ensuring proper alignment of
the four mounting holes. Secure in place with
four metric bolts, flat washers and lockwash-
ers.
Reinstall the two side covers on the expansion
cabinet and secure in place using four screws
(two per side).
Install the top cover on the expansion cabinet
and secure with four screws.
Connect the intercabinet ground wire in accor-
dance with Figure 4-8.
Route the expansion cabinet ribbon cable
from J406 in the expansion cabinet through
the opening provided in the cabinet bottom
and connect to the basic cabinet backplane at
J403.
Remove three screws from the secondary
power supply. From the front of the expansion
cabinet, slide the power supply into the rack
and secure in place with the three rear screws.
NOTE:
Prior to routing intercabinet cabling, check the
15-amp fuse (F2) located at the top of the main
power supply to verify that it is in working
order.
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INSTALLATION INSTRUCTIONS
SECTION 200-255-204
JUNE1992
Route the power supply cabling through the
hole in the expansion cabinet and connect
both power supplies to the upper connectors
at the Pl, P2 and P3 receptacles.
With the main power supply turned OFF, plug
the AC power cord into the AC outlet.
Momentarily press each secondary power
supply circuit breaker to verify that it is not
tripped.
Place the main power supply power switch in
the ON position.
Verify that all secondary power supply power
indicator LEDs are on. If any of the LEDs are
not on, replace the NPSA-S (RINGER LED
should be pulsating rapidly).
Using a multimeter (set to the appropriate
ranges), check the pins on connectors 5701
and J702 on the secondary power supply for
the voltages shown in Figure 4-9. (The con-
nectors are on the rear of the power supply
chassis.) Measure between the voltage pin
and a ground pin. (All ground leads are tied to
a single point, so any can be used.) Figure 4-
9 also shows the acceptable range for each
output voltage. If a measured voltage falls
outside of the acceptable range, replace the
secondary power supply.
Turn the power supply OFF.
Plug in connectors J701 and J702.
Route cable J703 into the basic cabinet and
plug it into connector J803.
Reinstall the rear panels and doors on both
cabinets and secure in place with screws.
3. PRINTED CIRCUIT BOARD INSTALLATION
3.00 NFDU
3.01 Install an NFDU in the FDDO slot in the basic
cabinet. If the system uses 0.02 or later version
softwareand Remote Maintenance, asecond NFDU
must be installed in the FDDI slot in the basic
cabinet. There are different strap selections on the
various NFDUs, depending on the slot in which the
4-9
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