Chapter 5. GENERAL SUPPORT MAINTENANCE INSTRUCTIONS

TM 32-5865-218-24&P

CHAPTER 5

GENERAL SUPPORT MAINTENANCE INSTRUCTIONS

Section I.

GENERAL

5-1. Scope.

This chapter provides general support maintenance

instructions for the ECM panel indicator and the countermeasures

Troubleshooting and test procedures in this chapter

control.

supplement maintenance instructions provided in TM 32-5865-012-20

by using additional test equipment, tools, and materials available to

general support maintenance.

5-2. Organization.

This chapter contains reference data for and

measurements made on the ECM panel indicator and countermeasures

This chapter also lists tools

control to determine proper operation.

and test equipment required and provides troubleshooting procedures.

In addition, the chapter provides maintenance and test procedures to

the component level for general support maintenance.

The ECM Control

5-3. Countermeasures Control Measurements and Data.

contains resistor R2, a 620 ohm isolation resistor which isolates the

audio line for transmitter No. 4 from the other audio circuits. This

If R2 should open,

resistor prevents crosstalk between channels.

If R2 should short,

other audio channels will overide channel 4.

Channel 4 will overide all other channels. Whenever the ECM Control

is reported failed due to crosstalk, R2 should be checked before any

other troubleshooting procedures is attempted. To verify resistor

R2, refer to FO-2, and measure the resistance between connector pins

Replace R2

The measurement should be 62

ohms.

J2-J and J6-K.

if any other reading is obtained.

Section II.

TOOLS AND EQUIPMENT

5-4. General.

This section lists tools, test equipment, and

materials required to perform general support maintenance.

5-5. Tools and Equipment Required. Lists of authorized common tools

and equipment are provided as part of the Maintenance Allocation

Appendix D of this

Chart (MAC) located in Appendix B of this manual.

manual is a list of expendable supplies and materials required.

5-1