REPLACEMENT OF INDICATOR LIGHTS.

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