Section 5. MAINTENANCE - TM-11-5820-917-130101

TM 11-5820-917-13

SECTION 5

MAINTENANCE

INTRODUCTION

5-2. This section provides maintenance and service information for the RCS-4B

receiver. Included are tables of recommended test equipment, a preventive main-

tenance schedule, corrective maintenance procedures, and performance verifi-

cation data. An understanding of the theory of operation from Section 4 is required

for troubleshooting and repairing the receiver.

5-3. TEST EQUIPMENT

5-4. Recommended test equipment for performance checking and troubleshooting

is listed in table 5-1. Other test instruments may be used if their performance is

equivalent to those listed. If a test measurement is made which is outside the

acceptable range, operation of the test equipment should first be verified before

assuming malfunction of the equipment under test.

PREVENTIVE

MAINTENANCE

5-6. Table 5-2 provides a list of recommended preventive maintenance proce-

dures. To assist in obtaining long-term trouble-free operation of the receiver,

the maintenance schedule as recommended should be adhered to as closely as

possible. Marginal operation of any unit checked should be noted and carefully

re-examined at the next maintenance period.

WARNING

In the performance of some maintenance procedures, it is necessary to have

the equipment energized and dust covers removed. Extreme care must be

exercised in making internal measurements or adjustments since potentially

lethal voltages are present.

CORRECTIVE

MAINTENANCE

5-8. The corrective maintenance data provided in this section consists of

troubleshooting procedures and adjustment procedures. Parts requiring removal

during relevant adjustment operations are described and illustrated as necessary.

The recommended maintenance approach for the RCS-4B receiver is repair by

replacement of assemblies. Faulty assemblies are returned to the depot for repair

to a part level.

5-9. TROUBLESHOOTING PROCEDURES. Table 5-3 provides a basic guide

to troubleshooting the receiver. The table is not intended to be all inclusive,

but rather to provide indications of what unit or assembly is defective. One

approach to fault isolation is to derive all possible information from the function

or malfunction of operating controls and indicators and then, through systematic

analysis of test and measurement data, along with the troubleshooting guides,

localize a fault to a module or assembly. The malfunction is verified and corrected

5-1