TM 11-5895-846-14
when separating it from the shelter wall. (Retain the
gasket.)
(1) Remove the two nuts and lockwasher
(7) With the EMI filter and power entry panel
which secure the board to the front of the PDP.
out of the shelter refer to figure FO-8 and perform
(2) Using a soldering iron, remove and tag the
continuity checks to determine the defective component,
wires from the board.
if necessary. (Remove bottom cover by removing 14
(3) Replace the board by performing steps (1)
and (2) above in reverse order.
(a) Check for obvious physical damage to the
h. Meter M1.
EMI filters, FL1 through FL8. Replace if necessary (refer
to c below). Check for charring or other evidence of
(1) Remove the nuts and washers securing
shorts.
the wires to the meter and tag the wires.
(b) Perform a continuity check of the
(2) Remove the capacitor mounted on the
suspected input line by measuring between the power
terminal lugs.
input connector and the terminal on the top of the EMI
(3) Remove the three screws, washers, and
nuts which secure the meter to the front panel.
(c) Check for shorts to ground by
(4) Replace the meter by performing steps
continuity checking between the input terminal of the
(1), (2), and (3) above in reverse order.
suspected EMI filter to ground (if necessary, electrically
i. AC Indicator Lamps (XDS1 and XDS2).
disconnect the associated resistor, R1 through R8).
(d) If a short is found, disconnect the
(1) Remove the lens from the front of the
appropriate filter from the input connector and perform
lamp holders.
continuity checks to determine if the filter or connector is
(2) Using a soldering iron, remove and tag the
at fault.
wires from the lamp holder.
(8) Refer to b and c below for component
(3) Remove the nut and lockwasher at the
replacement procedure.
rear of the lamp holder. Remove the lamp holder.
(9) Replace EMI filter and power entry panel
(4) Replace the lamp holder by performing
by reversing the procedure of steps (1) through (6)
steps (1), (2), and (3) above in reverse order.
above.
7-8. Maintenance of Power Entry Panel and EMI
b. Replacement of MAIN POWER CONNECTORS
Filter.
J1 and J2.
Maintenance of power entry and EMI filter is limited to
(1) It is not absolutely necessary to remove
replacement as described in paragraphs a, b, and c
the filter assembly from the shelter to circuit check or
below.
remove the connectors.
a. Removal and Replacement of EMI Filter and
holding the top cover plate in place. (Carefully remove
Power Entry Panel (fig. 1-5).
the top cover plate and RFI gasket taking care not to
(1) Turn auxiliary power off and disconnect
damage the gasket.) (3) Remove the four wires from the
power cable and ground cable at outside of shelter.
INPUT terminals of filters FL3, FL4, FL7 and FL8, if
removing J1, or filters FL1, FL2, FL5 and FL6, if
NOTE
removing J2. Take care not to damage the terminal
It is not necessary to remove the
insulator and bleeder resistor on the filters. (Note the
assembly to replace or check all
identification marking on each lead as it is removed for
components.
Refer to applicable
later replacement.) (4) Remove the two ground wires
section before removing.
from bus bar W1. (Note the identification marking on
each lead for later replacement.) (5) Remove the
(2) Remove the two connectors P1 and P2
protective cover from the connector.
from the bottom of the PDP unit.
(6) Remove the jam nut securing the
(3) Remove the stowage bracket located in
connector to the power entry panel. Also remove the
front of the EMI filter by removing the six screws and
washer captivating the protective cover.
washers.
(7) Remove the connector carefully.
(4) Remove the four screws securing the
(8) Unsolder the wire from one lug on the
bottom of the unit to the shelter floor.
connector and resolder to the corresponding lug on the
(5) Outside the shelter, remove the 16
replacement connector. Repeat this process for the
Phillips-head screws from the power entry panel.
remaining wires.
(6) Remove the EMI filter and power entry
(9) Install the new connector orienting the
panel taking care to keep the watertight RFI gasket intact
7-5