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TM 11-5920-252-24
SECTION III. TROUBLESHOOTING
Section Contents
Paragraph
General .......................................................................................
2-7
Tools and Test Equipment ..........................................................
2.8
Troubleshooting Procedure ........................................................
29
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
1.
Determine the faulty channel.
2.
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.
3.
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
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