TM 11-6625-1614-15

Model 410C

instrument circuitry in an effort to localize the problem . These operations should be undertaken only after it has been established that the difficulty can not be eliminated by the Adjustment and Calibration Pro-

cedures, Paragraph 5-26.

An investigation should

also be made

to insure that

the trouble is not a result

of conditions

external to the

Model 410C.

5-38. Conduct a visual check of the Model 410C for possible burned or loose components, loose connec-

tions, or

any other

obvious conditions which

might

suggest a

source of

trouble.

 

5-39. Table 5-9 contains a summary of the front- panel symptoms that may be encountered. It should beueed in initial efforts to select a starting point for troubleshooting operations.

5-40. Table 5-10,in conjunction with Figure 5-5, contains procedures which may be used as a guide in isolating malfunctions. The steps in Table 5-10 describe the normal conditions which should be encoun-

tered during the checks ( circled numbers in Figure 5-5.

Section V Paragraphs 5-38to 5-46

Figure 5-55-41. The checks outlined in Table 5-10 are not de-

signed to measure all circuit parameters, rather only to localize the malfunction. .Therefore, it is quite possible that additional measurements will be required to completely isolate the problem. Amplifier gain may also vary slightly between instruments; therefore it should not be necessary to precisely duplicate waveforms or values described.

5-42. Voltage values indicated in Table 5-10are based on .5 vdc input, with Model 410C RANGE switch set to

.015 v.

5-43. When required, check power supply voltages as outlined in Paragraph 5-29.

5-44. Refer to Figure 5-9for typical waveforms encountered in the Model 410C. Waveforms represent signals which occur when instrument is operating during overdriven conditions (.5 vdc input to .015 v RANGE).

5-45. SERVICING ETCHED CIRCUIT BOARDS.

5-46. The

Model 410C has three etched circuit

Figure 5-5. Troubleshooting Tree

01566-2

5 - 1 4