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Weekly Preventive Maintenance Checks and Services Chart
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TM-11-6130-377-14 Inverter Power Static PP-7078/U Manual
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Fuse Replacement (1973 Model Only)
TM 11-6130-377-14
Item
No.
Trouble symptom
Corrective measures
3
DC VOLTAGE meter indicates 0 volt.
a.
Turn on dc power source.
b.
Set switch connected between the inverter and the dc
source to ON.
c.
Replace fuses, if provided, between dc power source
inverter.
4
DC VOLTAGE meter indicates below or above 143
Adjust the dc-power source to nominal 110 vdc (or at least
vdc, and when DC circuit breaker is operated, it
above and below 143 vcd).
springs to OFF.
Section III. ORGANIZATIONAL MAINTENANCE
and test equipment are specified in table B-1, appendix B
4-11. Scope of Organizational Maintenance
(MAC).
The maintenance duties assigned to organizational main-
tenance of the inverter are listed below with a reference to
4-12. Organizational Preventive Maintenance Checks
the paragraphs covering specific maintenance functions.
and Services
a. Quarterly preventive maintenance checks and
Organizational  preventive  maintenance  checks  and
services (para. 4-12).
services of the inverter are required quarterly (para. 4-13).
b. Fuse replacement (para. 4-16).
The  quarterly  preventive  maintenance  checks  and
services are performed while the inverter is operating and
c.  Clean and/or replace air filter element (para. 4-
under the conditions listed below.
14, and 4-15).
a. When the equipment is initially installed.
d. Indicator lamp replacement (para. 4-17).
b. When the equipment is reinstalled after removal
e. Troubleshooting (para 4-18). The required tools
for any reason.
4-13. Quarterly Preventive Maintenance Checks and Services Chart
Sequence
No.
Item
Procedure
References
1
Cleanliness ................................
Check that the air filter elements are clean.
2
Cables .......................................
Visually inspect all exterior cables for kinks, strain, cut,
frayed or otherwise damaged insulation
3
Indicator Lamps .........................
Check that indicator lamps are in serviceable condition.
edge.
The fifth air filter is located in the base
4-14. Cleaning Air Filters
subassembly. Use the appropriate procedure given in a
To clean air filters proceed as follows:
or b below to remove or replace the air filters.
a. Remove air filter as described in paragraph 4-15.
a. Front and Side Panel Mounted Air Filters.  To
b. Clean the air filter in a solution of water and
remove or replace a front or side panel mounted air filter
detergent.
(fig. 2-1 and 3-1) proceed as follows:
c.  Air dry the filter or, if compressed air is available,
(1)  Locate the pry-slot in the screen assembly
dry the filter by blowing air (not to exceed 30 psi) through
of the air filter.
it.
(2)  Insert the blade of a flat tip screwdriver in
d. Replace the air filter as described in paragraph 4-
the pry-slot of the screen assembly and gently apply
15.
pressure to remove the screen.
4-15. Air Filter Removal and Replacement
(3)
Lift out the filter assembly from its retaining
frame.
The inverter is equipped with five air filters. Two air filters
are located on the front panel assembly, lower edge, and
(4)  Insert cleaned (para 4-14) or replacement
two are located on the right hand side panel near the top
air filter into its retaining frame.
Change 1
4-3

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