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Cooling Fan Removal and Replacement
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TM-11-6130-377-14 Inverter Power Static PP-7078/U Manual
Next
Section IV. VERIFICATION AND ADJUSTMENT
TM 11-6130-377-14
NOTE
(9) Tag all electrical leads to ensure proper
Turn the mounting screws so that
reassembly.
they clear the captive nuts in the fan
(10) Using a 25 watt soldering iron unsolder
plate. The screws and lockwashers
the leads from the fan terminals and remove the fan.
must remain in the fan housing
(11) Support the replacement fan assembly
during removal.
and attach the electrical leads to the fan terminals
making a good mechanical joint, then solder the
(7) Carefully lift and swing the fan assembly
electrical leads to the terminals.
out of the heat sink duct and support it to relieve the
(12) Position  the  fan  assembly  on  the
strain on electrical leads.
mounting brackets and align the screw holes.
(8) Remove the four screws and lockwashers
(13) Install  the  four  screws  through  the
from the fan housing and tag for reuse.
mounting  brackets  and  fan  housing,  install  the
(9) Tag all electrical leads to ensure proper
lockwashers and nuts. Tighten nuts.
reassembly.
(14) Position the right side panel against the
(10) Using a 25 watt soldering iron unsolder
upper brace angles and platform and align the bolt
the electrical leads from the fan terminals and remove
holes.
the fan.
(15) Install the cap screws and tighten to
(11) Support the replacement fan assembly
secure side panel.
and attach the electrical leads to the fan terminals
(16) Install the two lifting eyes and tighten the
making a good mechanical joint, then solder the
jam nuts.
electrical leads to the terminals.
(17) Position the top cover and place and align
(12) Install the four screws and lockwashers in
screw holes. Install twelve screws and lockwashers and
the holes of the fan housing.
tighten screws.
(13) Position the fan assembly in the heat sink
(18) Install the air filter and filter screen
duct and on the fan plate, and align the mounting holes.
assembly as described in paragraph 4-11.
(14) Using an offset crosspoint screwdriver
(19) Perform equipment starting procedure
turn the four screws down until tight.
(para 3-3) and operation of fans (para 4-8) to check for
(15) Position the heat sink duct cover on the
proper performance.
heat sink duct and align the mounting holes.
c. Heat Sink Duct Mounted Fan (Fig. 6-1).
(16) Install the ten screws, lockwashers and
(1) Position DC circuit breaker A1CB1 to
three harness clamps in their respective holes and
OFF.
tighten screws.
(2) Open front indicator panel.
(17) Position the inverter drive board A1A2 on
(3) Remove  connector  A1P1  from  its
the standoffs of the heat sink duct cover and align the
receptacle A1A2J1 on the inverter drive board A1A2.
mounting holes.
(4) Remove four screws securing the inverter
(18) Install the four screws and lockwashers
drive board to the heat sink and remove the inverter
and tighten screws.
drive board.
(19) Connect plug A1P1 to its receptacle
A1A2J1 on the inverter drive board A1A2.
NOTE
(20) Close the front indicator panel and secure
Make a note as to where the three
the four captive screws.
harness clamps are positioned so
(21) Perform equipment starting procedures
that they can be installed in same
(para 3-3) and operation of fans (para 4-8) to check for
place during installation.
proper performance.
(5) Remove ten screws, lockwashers and flat
6-19.
Capacitors A1C3-A (A1C4-A) Through A1C3-
washers securing the heat sink duct cover to the heat
H (A1C4-H)
sink duct and remove the cover.
(fig. 6-1)
(6) Using an offset crosspoint screwdriver
The eight capacitors are mounted in pairs on the left and
loosen the four screws and lockwashers securing the fan
right side panels. Right side panel holds A through D
assembly to the fan plate.
and left side panel holds E through H. To remove and
replace any pair of the capacitors proceed as follows:
Change 1
6-16

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