GENERAL SUPPORT MAINTENANCE INSTRUCTIONS
This chapter provides general support maintenance
instructions for the ECM panel indicator and the countermeasures
Troubleshooting and test procedures in this chapter
supplement maintenance instructions provided in TM 32-5865-012-20
by using additional test equipment, tools, and materials available to
general support maintenance.
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
The measurement should be 62
J2-J and J6-K.
if any other reading is obtained.
TOOLS AND EQUIPMENT
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.