SECTION III. TROUBLESHOOTING - TM-11-5920-252-240019

TM 11-5920-252-24

SECTION III. TROUBLESHOOTING

Section Contents

Paragraph

General .......................................................................................

2-7

Tools and Test Equipment ..........................................................

2.8

Troubleshooting Procedure ........................................................

2.7

GENERAL

Troubleshooting at the organizational maintenance level is limited to resistance measurements.

The arrester is a passive device, therefore the absence of a signal to a shelter communications equipment could be the

fault of the arrester when it is certain that the signal is present at the input (channel) of the arrester.

Table 2-2 gives the typical channel numbers with the circuit over which signals pass through the arrester. For example,

the 4 lines used for channel 1 are P1 to J1 pins A to A, B to B, C to C and D to D.

2-8.

TOOLS AND TEST EQUIPMENTI

A Phillips screwdriver located in Tool Kit, Electronic Equipment TK-101/G is required for access to the arrester.

Multimeter TS-352B8U is required to make the necessary resistance measurements.

2-9.

TROUBLESHOOTING PROCEDURE

Determine the faulty channel.

Remove the access panel of the SIGNAL ENTRANCE panel. Determine from Table 2-2 which circuits may be at

fault and disconnect P and J connectors of the arrester.

Perform continuity check as follows:

Set TS-352B/U FUNCTION switch to OHMS and set range switch to RX1.

Connect the TS-352BIU leads to the same lettered pins on the P and J connectors shown in Table 2-2.

All resistance measurements should be less than 20 ohms. If any measurement is more than 20 ohms,

higher level of maintenance is required.

2-4