Chapter 2. UNIT TROUBLESHOOTING PROCEDURES

TM-11-5830-263-20&P

CHAPTER 2

UNIT TROUBLESHOOTING PROCEDURES

SECTION I

General Unit Troubleshooting Inspection.................................................................... 2-1

SECTION II

Equipment Location and Configuration Diagrams ...................................................... 2-2

SECTION III

System Troubleshooting With No Error Shown on Alphanumeric Display ................. 2-42

SECTION IV

System Troubleshooting With Error Shown on Alphanumeric Display ....................... 2-59

SECTION V

Troubleshooting of Cable Assemblies ........................................................................ 2-66

SECTION I

GENERAL UNIT TROUBLESHOOTING INSPECTION

CAUTION

BE SURE TO REMOVE POWER FROM THE MCS BEFORE DISCONNECTING OR

REMOVING AND REPLACING COMPONENTS AND/OR CABLES.

2.1.

GENERAL

If a troubleshooting procedure identifies a piece of equipment as defective refer to Chapter 3 of this

manual for all Removal and Replacement Procedures. Section III of the Maintenance Allocation Chart

(MAC) in Appendix B contains a list of all tools and test equipment required to troubleshoot the Vehicular

Intercommunication Set (VIS). Appendix C contains the Repair Parts and Special Tools List (RPSTL)

identifying the piece parts for repair.

2.2.

SCOPE OF UNIT TROUBLESHOOTING

Unit maintenance involves confirmation of operational problems reported by VIS users, diagnosis of

confirmed problems, and problem correction usually by replacement of units found to be faulty. Problems

may be identified by physical inspection of damaged equipment, by specific failure indications such as an

illuminated fault light or an inability to communicate, or by an alphanumeric error indication on the MCS

display. To adequately troubleshoot VIS, the unit maintainer is required to have one spare MCS and one

spare RIT (if vehicle has only one RIT normally).

2.3.

EQUIPMENT INSPECTIONS/CHECKS/GUIDELINES

Prior to beginning any troubleshooting procedures always review the report of the user problems and

verify if possible by observation. Sections IV, V, and VI of this chapter cover, respectively:

Troubleshooting system problems that "do not' show up as errors on the alphanumeric display.

Troubleshooting system problems that "do" show up as errors on the alphanumeric display.

Troubleshooting cable assemblies.

Before initiating any of the troubleshooting procedures in Sections IV, V, and VI there are some checks

that can be accomplished. These checks, as well as the troubleshooting procedures in later sections,

involve utilizing the VIS Operator's Manual, TM 11-5830-263-10. The checks are as follows:

2-1