Section II. TOOLS, TEST EQUIPMENT AND TROUBLESHOOTING

TM 11-6625-444-14-1

Section Il. TOOLS, TEST EQUIPMENT AND TROUBLESHOOTING

equipment required for maintenance of the

6-5. Tools and Test Equipment Required

voltmeter. No special tools are required.

This section contains a listing (table 6-7) of test

Table 6-7. Required Test Equipment

task. Since a number of subassemblies are in-

6-6. Troubleshooting Instructions

volved, the first step in troubleshooting after

a. The troubleshooting information contained

visual inspection is to isolate the trouble to a

i n this section includes both step-by-step

particular section. Once this is accomplished,

procedures and fault logic diagrams to assist in

each subassembly in that particular section can

rapdily locating a defective assembly and com-

then be tested to reveal the exact source of

ponent parts.

trouble.

b. Troubleshooting starts by first performing a

NOTE

thorough visual inspection for improperly seated

Install each assembly referenced during

plug-in assemblies, l o o s e or broken wires,

troubleshooting on the extender card

physically damaged parts, and other obvious

provided with the voltmeter to facilitate

problems. Next, the performance characteristics

access to test points.

should be checked in accordance with paragraph

b. Power Supply. Correct operation of the

6-16 and any discrepancies noted. The results

power supply section (A 1 ) is verified by making

from these tests can then be used to help in

the voltage checks in table 6-8. All circuitry for

locating the exact source of trouble.

this section is contained on the power supply

6-7. Section Fault Isolation

assembly the location of which is shown in figure

a. General. The voltmeter consists of four

6-1. Test point and adjustment locations are

major sections: power supply; analog; digital;

shown in figure 6-2. Component parts are shown

and ratio. Each section, except for the power

in figure 6-9.

supply, consists of a number of subassemblies

which together perform a separate but distinct

6-15