Section III. MAINTENANCE - TM-9-4910-736-14-P0049

TM 9-4910-736-14&P

Section III. MAINTENANCE

INTRODUCTION. This section contains procedures for maintaining the test

set. It includes instructions for performing cleaning, troubleshooting, repair,

disassembly, reassembly, adjustments, and test procedures.

CLEANING .

Periodically clean the test set using procedures given below.

Case, Cover and Panel Assembly.

Proceed as follows:

(1) Wipe case, cover, and panel assembly with lint-free cloth dampened

with soap and water.

(2) Rinse thoroughly with fresh, clean water.

WARNING

When using compressed air, do not exceed 10 psi. Compressed

air in excess of 10 psi can cause injury. Do not direct

compressed air against skin.

Electrical Parts.

Clean with soft-bristle brush or with compressed air

(ohserve WARNING).

TROUBLESHOOTING . Troubleshooting procedures should be accomplished in

the following order. First perform a pre-troubleshooting check, then a visual

check, then a resistance (continuity) check and finally if the trouble has not

yet been located, troubleshoot by consulting the troubleshooting guide.

Pre-Troubleshooting Check.

Proceed as follows:

(1) Check that BAT LEADS are properly connected to the battery; +12 V

lead to positive terminal and -12 V lead to negative terminal.

(2) Check that the PUSH TO RESET window is clear. If it is red, depress

the PUSH TO RESET switch to reset the circuit breaker.

(3) Check that battery or power supply voltage being used is at least

12 volts and does not exceed 16 volts.

Visual Check. Remove 12 front panel screws and lift out the front

panel printed circuit board assembly. Visually inspect for open wire,

discolored resistor, signs of burnt component, and any other visible

signs of malfunction.

Resistance Check. Refer to table 3-1 for resistance check. Disconnect

the battery from the unit and perform the resistance (continuity) checks

with the switches as indicated in table 3-1.