Table 7-2. Tools and Test Equipment Required
If the proper voltage is present on P1 and P2,
proceed to step g below as follows:
NSN or Part
g. Circuit check the wiring between J1, J2 and
XDS1, XDS2, CB1 and CB2 (fig. FO-6) and replace
h. After repairs or replacement, reinstall the PDP
in the shelter and return the shelter to operational status.
Tool Kit, Electronic Equipment
If MAIN-1 circuit breaker trips repeatedly,
Replace MAIN-1 circuit breaker CB1 as
7-5. Troubleshooting the Wired Shelter
Troubleshooting the wired shelter is accomplished by
k. If MAIN-1 still trips, replace the voltrip unit Al as
performing voltage and continuity checks.
check for proper operation.
I. If MAIN-2 circuit breaker trips repeatedly, remove
Voltages dangerous to life exist in the
Exercise extreme care if
m. Replace MAIN-2 circuit breaker CB2 as
voltage checks must be performed.
When performing continuity checks,
n. If MAIN-2 still trips, replace the voltrip unit A2
disconnect the main power input
cables from the shelter power entry
and check for proper operation.
panel MAIN POWER 1 and 2
o. Observe that the phase sequence indicators
are illuminated. Check the phase sequence wiring at the
source if the NO GO indicators are illuminated. If the
a. Disconnect the main power input cables from
phase sequence is correct, replace voltrip unit Al if DS5
the shelter power entry panel main power connectors.
is lit or voltrip unit A2 if DS4 is lit as instructed in
Verify proper power input at the power source (120/208
Vac 10 %, 3 phase, 50/60 Hz 5%).
If either GO indicator is not illuminated replace
the lamps. If either GO indicator is still not illuminated
replace voltrip unit Al for lamp DS2 or voltrip unit A2 for
This may be accomplished by
measuring 120 Vac between each
q. If circuit breakers for the TTY, dehydrator, rack
phase and neutral. Phase A is in pin
1 through 4 or utilities and lights trip repeatedly check for
B, phase B is in pin C, phase C is in
continuity of the shelter wiring and shorts to ground (fig.
pin E, and the neutral is in pin F (fig.
If the voltage
is not correct,
Remove power from the shelter.
b. Remove P3 through P11 from PDP connectors
J3 through J11 and apply power to the shelters.
r. If the shelter wiring is satisfactory, check the
c. Observe the two POWER IN Lamps. If lit,
PDP wiring for continuity and shorts to ground (fig. FO-
proceed to step f below.
d. If the POWER IN lamps are not lit, check the
s. If the PDP wiring is satisfactory replace the
lamps by substitution. If the lamps still do not light,
remove the two shelter cable plugs (P1 and P2) from
7. Replace the PDP in the shelter and check for proper
PDP unit connectors J1 and J2, respectively (fig. 7-1).
e. Check for presence of the voltage at the proper pins
t. If the PA1, PA2 or air conditioner operation is
in P1 and P2 (fig. FO-6). If the voltage is not present
faulty, check the shelter wiring with the power removed
check the wiring between the main power input
from the shelter (fig. FO-7 for the basic terminal, fig.
connectors J1 and J2 and the EM1 filters by removing
FO-21 for the radio subsystem racks and fig. FO-22 for
the cover on top of the EM1 filter assembly. This is done
u. If the shelter wiring is satisfactory, check the
by removing the 18 screws securing the cover to the
Repeat step a above and replace the
wiring and switch S2 in the PDP (fig. FO-6). Replace
appropriate filter or other component in the EMI filter.
the defective wiring or switch S2 as instructed in
If the wiring
is defective, repair
v. If circuit breakers for racks 5 through 8 trip
repeatedly, check for continuity of the shelter wiring