Section II. TROUBLESHOOTING - TM-11-5820-695-350244

TM 11-5820-695-35

Section II. TROUBLESHOOTING

major unit responsible for abnormal operation. The

second step is to localize the fault to a group of

WARNING

components or circuits within the faulty unit. After the

115 vac is present in Transmitter,

fault has been localized, it must be isolated to a single

Radio

T-1054(P)/GRC-144(V),

component, wire, or piece part that is defective.

T1054(P)A/GRC-144(V),

Receiver

Radio

R-1467(P)/GRC-144(V),

R1467(P)A/GRC-144(V) and Converter

b. Sectionalization. Use the checks listed in (1)

Multiplier CV-3633/GRC144(V).

through (3) below to sectionalize the fault in all

AN/GRC-144(V) Radio Sets to a major unit. The

not remove or replace parts, nor

Checks are arranged to reduce unnecessary work and

perform continuity or resistance

aid in tracing the fault to the major unit responsible for

checks while primary power is

abnormal operations.

applied to the equipment.

NOTE

(1) Visual inspection. Most faults in Radio

For all removal and replacement of

Set AN/GRC-144(V) can be sectionalized to a major unit

units listed in the procedures not

by observing the status and alarm indicators on

described below, where applicable,

Transmitter,

Radio

T-1054(P)/GRC-144(V),

T-

1054(P)A/GRC-144(V),

Receiver,

Radio

R-

refer to TM 11-5820-695-12.

1467(P)/GRC-144(V), R-1467(P)A/GRC-I 144(V) and

CV-3633/CGRC-144(V).

3-4 General

(2) Operational checks.

When visual

Troubleshooting procedures described in this section

inspection fails to sectionalize a fault in Radio Set AN/

provide maintenance personnel with a systematic

GRC-144 to a major unit, use the operational -checks

method of isolating troubles within Transmitter, Radio T-

provided in the monthly preventive maintenance checks

1054(P)/GRC144(V),

T-1054(P)A/GRC-144(V),

and services chart in TM 115820495-12 to sectionalize

Receiver Radio R-1467(P)/GRC-144(V), R-1467(P)A/

the fault.

GRC-144(V), and Indicator, Antenna Alignment ID-

(3) Interunit cable checks. When a fault

1708/GRC. The troubleshooting procedures for T-

cannot be sectionalized to a major unit using the

1045(P)/GRC-144(V),

T1054(P)A/GRC-144(V),

R-

sectionalization techniques listed above, check the

1467(P)/GRC144(V)

and

R-1467(P)A/GRC-144(V)

interconnecting cables between Transmitter, Radio T-

consist of troubleshooting charts (para 3-6b and 3-12b);

1054(P)/GRC--144(V),

T-1054(P)

A/GRC-144(V),

and trouble isolation checks (para 3-7 through 3-11, and

Receiver

Radio

R-1467(P)

/GRC-144(V),

R-

3-13 through 3-17). Troubleshooting procedures for

1467(P)A/GRC-144(V) and Converter-Multiplier CV-

Indicator, Antenna Alignment ID-1708/GRC are

3633/GRC144(V). Interconnection cabling diagrams in

contained in paragraph 3-18 and troubleshooting

TM 11-5820-695-12 provide routing information for

procedures for Converter-Multiplier CV-3633/GRC-

performing the interunit cable checks.

144(V) are contained in paragraph 3-18.1.

c. Localization.

After the fault has been

3-5. Organization of Troubleshooting Procedures

sectionalized to a major unit, it is necessary to localize

the fault to a group of components or circuits within the

a. General. The first step in servicing a defective

faulty unit. The localization procedures consist of

radio set is to sectionalize the fault to the

troubleshooting charts (para 3-6b, 3-12b, and 3-18.1b)

that will aid the repairman in localizing faults in

AN/GRC-144 Radio Sets.

In many instances the

localization proce-

Change 6 3-2.2