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Front Loop and Back Loop Adjustment (R732 and R742)
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TM-11-6125-259-30 Inverter Power Static PP-7274C/A Manual
Next
Nonformal Coating with 1B31 (Humiseal)
TM 11-6125-259-30
assembly with six screws (20), six lockwashers (21)
voltmeter AN/GSM-64 No. 1.
and six flat washers (22).
f. Slowly adjust potentiometer R635 clockwise
r. Install bottom cover (18) on housing (12 with
until the oscilloscope waveform goes to 0 volts.
six screws (19).
g. Set UNIT PWR switch to S6 to down (off)
position.
3-15. Input Overvoltage Adjustment (R635)
h. Disconnect oscilloscope from inverter.
a. If not already performed, perform disassembly
i. Perform assembly procedures in para 3-14 p, q,
and r.
procedures in paragraph 3-14 a through f.
b. Connect Oscilloscope AN/USM-281 to pins
3-16. Repair Materials
15(+) and 7(-) of component assembly A6 (fig.
3-17).
Paragraphs 8-17 through 3-19 contain procedures
c. Turn potentiometer R635 fully coun-
for using repair materials which are needed when
terclockwise.
replacing certain component parts. Table 3-3 lists
the repair materials; table 3-4 lists the component
d. connect inverter to test fixture per figures
parts and their location; pargraphs3-17 through
3-19.
e. Set UNIT PWR switch S6 to ON position and
3-19 contain instructions for preparing and using
the repair materials.
adjust input to 44 0.5 vdc as read on digital
Table 3-3. Repair Materials
TYPE
MATERIAL
SOURCE
Paint
Flat Black
Commercially available
SN60-40
Kester Solder Company
4201 Wrightwood Ave.
Chicago, IL
FSCM 75295
Epocast 202
Furane Plastics, Inc.
Adhesive, Staking
5121 San Fernando Rd.
I
I
Los Angeles, CA 90039
FSCM 99384
Artist, small
Brush
Commercially available
Tuluol/Toluene
VanWaters and Rogers
Anhydrous Reagent Grade
1363 S. Bonnie Beach Pl.
Los Angeles, CA
FSCM 08455
1B31, Humiseal
Conformal Coating
Columbia Chase Corp.
Humiseal Division
Woodside, New York 11377
MIL-I-10428
Isopropyl Alcohol
Commercially available
RTV-615 A & B
General Electric
Silicone Rubber
Silicone Products Dept.
Waterford, NY 12188
FSCM 01139
RTV-910
Diluent
1G-101
Emerson & Cumings
Microballoon Sphere
Canton, MA 02021
FSCM 04552
Table 3-4 Cross Reference To Module/Component assemblies
Needing Repair Materials
REPAIR PROCEDURE AND COMPONENT PARTS
MODULE/COMPONENT ASSEMBLY
EMI MODULE Al (fig. 3-10)
Capacitors C100 through C104 and C106 through C109 are
secured with a fillet of Epocast 202 (100 parts of 202).
HIGH LEVEL BOOST MODULE A2 (fig. 3-11)
a. Capacitors C201 and C202 are secured with a fillet of
Epocast 202 (100 parts of 202).
b. A2 module is conformal coated with 1B31 (Humiseal), both
sides.
LOW LEVEL BOOST MODULE A3 (fig. 3-12
a. Capacitors C301 and C302 are secured with a fillet of
Epocast 202 (100 parts of 202).
b. A3 module is conformal coated with 1B31 (Humiseal), both
sides.
3-24

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