TM 11-6625-2575-14
Section Ill.
shorts. Cable shall be replaced if excessive stress-
es are caused by shortening the cable to make
a. Repair procedures shall consist of quality
repairs.
standards for wiring and soldering of electronic
equipment. Additional precautions are required
c. Precautions shall be observed when remov-
to restore the AN/USM-203A to its original con-
ing and replacing components on the printed cir-
cuit assemblies. Attempt to restore the board
dition. When replacing defective parts, be sure
to localize heat to the solder joints affected. All
to its original condition. Remove flux and clean-
ing agent residue from the board.
solder joints shall be smooth, bright, and feathered
out to a thin edge, indicating proper flow and
wetting action. Leads should be tagged for iden-
tification when assemblies are removed. Lead
When repairs on a defective AN/USM-203A have
length and component position should be dupli-
been completed, perform the alignment and cali-
cated when components are replaced.
bration r e q u i r e d ( p a r a 1 - 5 ) . A n y A N /
b. Small diameter coaxial cable connections re-
USM-203A that cannot be satisfactorily repaired
quire special attention to prevent breaks and
shall be sent to a higher maintenance category.
Section IV. TEST PROCEDURES
The extent of repair on the AN/USM-203A will
Follow the procedures in paragraph 7-4 and
determine whether or not alignment is required.
If a repaired AN/USM-203A (unit under test)
test is within the stated voltage tolerances, and
meets the test requirements in paragraphs 7-9,
is in agreement with the typical voltages and
7-10, and 7-11, alignment is not required.
waveshapes, proceed to paragraph 7-10. If the
