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Page Title:
Removal of Chassis Mounted Components |
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 TM 9-4931-378-13&P
Removal of Chassis Mounted Components. Re-
(6) Removal of Power Supply PS2. R e m o v e
b.
power supply PS2 (94) as follows:
move chassis mounted components by performing
( a ) Disconnect each wire from power
the following procedures:
supply PS2 (94) and label for later
(1) R e m o v a l o f T e r m i n a l B l o c k T B 1 . R e -
identification.
move terminal block TB1 as follows:
(b)
Remove
four
screws
(91)
and
(a) Disconnect each wire from terminal
washers (92).
block TB1 (77) and label for later
(c) Lift power supply PS2 (84) free of
identification.
chassis.
(b) Remove two screws (74), washers
(75) and nuts (78).
(7)
Removal
of
Diodes
CR1,
CR2
or
VR1 Remove diode CR1 (97), CR2 (95)
(c) Separate terminal block TB1 (77)
from chassis framework.
or VRI (96) as follows:
(2) Removal of Card Rack Assembly. R e -
(a)
Invert chassis to expose underside.
move card rack assembly (80) as follows:
(b) Record polarity of diode.
Remove 14 screws (86) and washers
(c) Unsolder diode from standoffs.
(a)
(85).
(d) If standoff requires removal, un-
(b) Lift card rack assembly (80) free of
solder each wire from standoff and
chassis framework.
label for later identification.
(3) R e m o v a l o f T e r m i n a l B l o c k T B 2 . R e -
(e) Remove appropriate screws and
move terminal block TB2 (81) as follows:
washers to free standoff from
(a) Disconnect each wire from terminal
chassis.
block TB2 (81) and label for later
(8) Removal of Resistor R1. Remove resistor
identification.
RI (98) as follows:
(b) Remove two screws (84), washers
( a ) Unsolder each wire from resistor
(83) and nuts (79).
R1 (98) and label for later identifi-
(c) Separate terminal block TB2 (81)
cation.
from framework.
(b) Remove two screws, washers and
(4) Removal of Grommets. R e m o v e g r o m -
nuts.
mets (89 and 93) by carefully prying out
(c) Lift resistor from inverted chassis.
of holes with a screwdriver.
(5) Removal of Power Supply PS1. R e m o v e
Removal of Resistors R2 and R3. R e -
(9)
power supply PSI (90) as follows:
move resistor R2 (99) or R3 (104) as fol-
Disconnect each wire from power
(a)
lows:
supply PSI (90) and label for later
( a ) Unsolder each wire from resistor
identification.
R2 (99) or R3 (104) and label for
(b) Remove four screws (88) and
later identification.
washers (87).
(b) Remove two screws, washers and
Lift power supply PSI (90) free of
(c)
nuts.
chassis.
(c) Lift resistor from inverted chassis.
Section Ill. CLEANING
c. If flux residue is found on any solder connection,
6-4. GENERAL
it shall be removed using isopropyl alcohol.
d. Exposed areas shall be cleaned with clean lint-free
cloth moistened with isopropyl alcohol.
Isopropyl alcohol (item 13, Appendix F) is re-
a.
Places inaccessible to a cloth shall be cleaned with
e.
quired for cleaning the test set.
a camel hair brush dipped in isopropyl alcohol.
f.
Cleaned areas should be dried with low pressure
b. Electro-mechanical components shall be cleaned
air.
with clean, dry, lint-free cloth.
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