Section II. TROUBLESHOOTING - TM-11-5895-1123-340087

TM 11-5895-1123-34

Section II. TROUBLESHOOTING

4-4. General

b. Table 4-7 contains the minimum performance

This section contains test and adjustment procedures,

standards to be used in testing, adjusting, and

minimum performance standards, and troubleshooting

troubleshooting the 20-Hz ringing supply assembly.

guides for the modules of the -48 vdc power supply, the

Refer to figure FO6 for a schematic diagram, and figure

20 Hz ringing supply assembly, and the control monitor -

4-8 for test setup.

48V/20 Hz assembly.

c. Table 4-8 contains the minimum performance

4-5. Performance Test and Schematic Diagram

standards to be used in testing and troubleshooting the

Locations

control monitor 48V/20 Hz assembly. Refer to figure FO-

a. Table 46 contains the minimum performance

7 for a schematic diagram and figure 4-10 for test setup.

standards to be used in testing, adjusting, and

d. Removal and replacement procedures for the

troubleshooting the -48 vdc power supply. Refer to

individual modules or components are covered in

figure FO-5 for a schematic diagram, and figure 4-7 for

Section III of this chapter.

test setup.

Figure 4- 7. Test Setup for -48 Vdc Power Supply.

Table 4-6. Performance and Troubleshooting Test for the -48 Vdc Power Supply SM-F-935778

Step

Test setup instructions

Normal indications

If indication is abnormal

WARNING

Voltages dangerous to life are present on the -48 vdc

power supply (UUT) during this procedure; therefore

the ac line voltage should be turned off when bodily

contact must be made with connections on the UUT.

NOTE

Each test in this procedure is dependent upon the oth-

ers; therefore all tests should be performed in the order

that they are presented.

4-9