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REMOVAL AND REPLACEMENT OF PARTS ON THUMBWHEEL SWITCH ASSEMBLIES.
Up
TM-11-5841-268-25 Control Transponder Set C-6280(P)/APX C-6280A(P)/APX C-67171APX & C-7483/APX Manual
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PACKAGING FOR STORAGE OR SHIPMENT.


T.O. 12P4-2APX-142
NAVAIR 16-35C6280-1
TM 11-5841-268-25
8­29. LUBRICATION.
8­23. REPLACEMENT OF INDICATOR LIGHTS.
8­30. When new rotary switches have been installed (para-
8­24. To replace either the REPLY or the TEST indicator
graph 8­15), or when thumbwheel switches have been dis-
light (35, FO­3; 44, FO­4; 34, FO­5), unscrew the indi-
assembled (paragraph 8­19), the bearing surfaces of the
cator light from the mounting base and install the replace-
switch actuating mechanisms and the gear teeth should be
ment light. To replace the mounting base for either of these
lubricated with a small amount of Lubriplate Aerogrease
lights (37, FO­3; 46, FO-4; 36, FO­5), remove plastic
(Lubricant 551D7-44). Remove any excess lubricant. Then,
light panel (paragraph 8­3) and the rear panel assembly
(paragraph 8­5). Unscrew the indicator light and proceed
turn switches several times to distribute lubricant.
as follows:
8­31. EQUIPMENT PERFORMANCE CHECK AFTER
Step 1. On C-6280A(P)/APX, loosen mounting nuts (47,
COMPLETION OF REPAIRS.
FO­4) on both indicator lights, and remove bracket assem-
8­32. When the transponder set control has been repaired
bly (50).
and reassembled, the operation of the controls and indica-
tors should be checked to verify satisfactory operation. Per-
Step 2. Unsolder wires from mounting base to be replaced.
form the check-out procedures of paragraphs 7­20 through
Step 3. Remove mounting nut (38, FO­3; 47, FO­4;
7­26. When these checks have been successfully performed,
37, FO­5) and remove mounting base.
the transponder set control is ready to be returned to service
and will furnish satisfactory operation equivalent to that of
Step 4. Install replacement mounting base with mounting
new equipment.
nut. On C-6280A(P)/APX, do not tighten mounting nut.
8­33. (Army) DEPOT OVERHAUL STANDARDS.
Step 5. See wiring diagram FO-2 and solder wires to
mounting base.
8­34. INTRODUCTION. After rebuild or repair, Control,
Transponder Set C-6280A(P)/APX must be tested thorough-
Step 6. On C-6280A(P)/APX, replace bracket assembly
ly to insure that it meets adequate performance standards
(50, FO-4) under nuts and washers (48 and 49) and tighten
for return to stock and reissue. Use the tests of paragraphs
both mounting nuts (47).
7­20 through 7­26 to measure the performance of the
repaired transponder set control. It is mandatory that re-
Step 7. Screw indicator light into mounting base.
paired equipment to be reissued, or returned to stock for
Step 8. Replace the plastic light panel and rear panel as-
reissue, meet all of the performance standards given in para-
sembly (paragraphs 8­3 and 8­5).
graphs 8­35 through 8-40.
8­35. REPAIR STANDARDS. Applicable procedures of
8­25. REPLACEMENT OF PANEL LIGHT BASES OF
the Signal Corps depot performing this test and its general
C-6280(P)/APX AND C-6280A(P)/APX.
standards for repaired signal equipment form a part of the
8­26. To replace any of the five panel light bases of the
requirements for testing this transponder set control.
C-6280(P)/APX or the C-6280A(P)/APX, remove the plastic
8­36. TECHNICAL PUBLICATIONS. No technical publi-
light panel (paragraph 8­3) and the rear panel assembly
cations are required other than this manual.
(paragraph 8-5), and proceed as follows:
8­37. MODIFICATION WORK ORDERS. Perform all
Step 1. Unsolder wires from panel light base (46, FO­3;
modification work orders applicable to this equipment be-
56, FO­4) to be replaced.
fore making the tests specified. DA Pam 310-7 lists all avail-
Step 2. Remove mounting nut and washer (47, 48, FO­3;
able MWOs.
57, 58, FO­4), and remove panel light base.
8­38. TEST FACILITIES REQUIRED. The only item re-
quired for depot testing the transponder set control is Multi-
Step 3. Install replacement base with nut and washer.
meter ME-26/U, or equivalent.
Step 4. Solder wires to replacement base.
8­39. GENERAL TEST REQUIREMENTS. A source of
28 volts DC is required for testing the indicator lights of a
Step 5. Replace the plastic light panel and rear panel as-
repaired transponder set control. Also, depending on the
sembly (paragraphs 8­3 and 8­5).
lamps installed, a source of either 6 volts DC or 28 volts DC
8­27. REPLACEMENT OF PANEL LAMPS OF C-6717/
is required for testing the panel illuminating lights. The test
APX AND C-7483/APX.
wiring described in paragraph 3­5 of this manual may be
used to facilitate measurements between contact pins of the
8­28. The 21 panel illuminating lamps of the C-6717/APX
electrical connector.
and the C-7483/APX are embedded in the plastic light panel
8­40. TESTS. After repairing or rebuilding the transponder
(9, FO-5) and are not individually replaceable. If the lamps
set control, perform the check-out procedures of paragraphs
are defective, refer to paragraph 8-3 and replace the plastic
7­20 through 7­26.
light panel.
8-4


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