Sectionalization Tests - TM-11-6625-667-450089

TM 11-6625-667-45/NAVAIR 16-30APM123-2/TO 33A1-3-367-22

braided) shields. Use jacketed cables

receptacle before power is reapplied to

to avoid short circuits where the cables

the test set.

must pass over the circuit cards and

CAUTION 3

other subassemblies.

Do not use test cables with exposed

a. Test Equipment Required

Technical Manual

Test Equipment

Oscilloscpe, AN/USM-281A . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 11-6625-l703-l6

Attenuator, Fixed (NSN 5905-00-781-0312).

Multimeter ME 26B/U . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 11-6625-200-15

Multimeter TS 352/U . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 11-6625-366-15

AN/UPM-15A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 11-6825-368-10

Test Set, Electron Tube TV 7/U . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 11-6625-274-12

Test Set, Radar AN/TPM-A . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 11-6625-2610-12

Test Set, Radar

. . . . . . . . . . . . . . . . . . . . . . . . NAVELEX 0960-158-1010 NAVAIR

16-30UPM-137-6-1 AIR FORCE T.O.

33A1-3-426-21-1

(cont . . . . . . . . . . . . . . . . . . . . NAVELEX 0969-158-1020 NAVAIR

Test Set, Radar

16-30UPM-137-6-2 AIR FORCE T.O.

83A1-3-426-21-2

Test Set Transistor TS 1836/U . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 11-6625-539-15

Wattmeter AN/URM-98 b. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 11-6625-433-15

the Test Set, Radar AN/UPM-137A is used, oscillscope AN/USM-281A and Test Set, Radar AN/TPM-25A are not

required.

Summation Bridge TS 779A/U and Waveguide Probe MX-2144/U.

b. Tools.

equipment connecting and test conditions.

(1) Repair Kit, P r i n t e d Wiring Board

Instructions are provided in the charts for using

MK-772/U.

the test equipment. These, instructions, however,

Equipment

( 2 ) Tool Kit, Electronic

should be supplamented with the instruction

TK-100/G.

manual applicable to the test equipment. Before

proceeding with a test setup, remove the trans-

3-15. Sectionalization Tests

ponder test set from its case remove the card

a. General. Sectionalization tests are per-

cage cover to expose the test points and controls.

formed to sectionalize a fault to a module or

Proceed as follows:

subassmembly. These tests are an extension of the

(1) Unlatch and remove the test set cover.

operational tests in the daily maintenance checks

(2) Remove four hexagonal screws from the

and services chart (TM 11-6625-667-12). Two

front panel with a hexagonal driver. One screw is

sectionalization tests are provided, the first uses

located above and one below each front panel

Radar Test Set AN/TPM-25A and the second

handle.

uses Radar Test Set AN/UPM-137A.

(3) Lift the TS-1089/APM-123V from the

b. Test Setups. A test setup is provided for

case. A gentle rocking motion may be necessary.

each type of test (fig. 3-22 through 3-25 for

(4) Set the TS-1089/APM-123V carefully on

sectionalization tests using AN/TPM-25A and

a clean area of the workbench. Position the

figure 3-5.1 for sectionalization tests using

TS-1089/APM-123V for convenient access to

A N / U P M - 1 3 7 A ) . Instructions f o r making

both the rear section (test point location, fig. 3-6),

p r i m a r y power c o n n e c t i o n s a r e i n T M

and the front panel.

11-6625-667-12. During the sectionalization

(5) Remove the card cage cover by un-

tests, the required setup is referred to and test

fastening the four screws which secure it to the

conditions noted. Refer to figure 3-6 for physical

preselector (A15A1Z1) and remove the two

location of the test points. Test steps must be

screws which secure it to the card cage.

performed in the order given to ensure proper

Change 5

3-44