HP 410C manual Servicing Etched Circuit Boards, Troubleshooting Tree 01566-2

Page 48

TM 11-6625-1614-15

Model 410C

instrument circuitry in an effort to localize the pro- blem. 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 des- cribe 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 wave- forms 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

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Contents HEWLETT-PACKARD Electronic Voltmeter Model 410C Exist in this Equipment HEWLETT-PACKARD Electronic Voltmeter List of Tables Number Section Section General Information Page Model 410C Description Model 410C Figures 2-land Section Installation 01556-1 Section Operation Front and Rear Panel Controls 01556-2 Voltage Measurement AT High FRE Pulse MeasurementsPRF Negative PulsesDC Voltage Measurements 01556-3 AC Voltage Measurements Section Model 410C 5 5 6 III Graph Used in Calculation of Pulse Voltage ReadingsResistance Measurements 01556-2 DC Nano-Amoere Current Measurements Section Input Network MODULATOR-DEMODULATORPower Supply Feedback NetworkSection 01556-2 Section Section 01556-2 Section Page BNC Alternate Voltage Source DC Voltmeter Operation Accuracy Check DCVInput Resistance Check DCV Input Resistance Check DCAModel 410C Section Tables 5-3and Amplifier Operation Ohmmeter OperationAmplifier Gain Check DC Amplifter Output Impedance Check AC Voltmeter Operation AC Probe Accuracy CheckAC Voltmeter Accuracy Check AC Voltmeter Frequency Response CheckSET Level Adjustment and Calibration Procedure Chopper Frequency AdjustN C T I O N COMPage C e t h e y a r e w i t h i n C Zero Adjust AC Full Scale Adjust .5 V RangeTroubleshooting Procedure D e l 4 1 0 C Troubleshooting Tree 01566-2 Servicing Etched Circuit BoardsChopper Assembly Installation Paragraph Section Model 410C 11. Model 11036A AC Probe Exploded View Change 16.1 Page Section Power Supply Schematic Typical Amplifier Waveforms Page Page Page Harold K. Johnson Page Metric System and Equivalents N 0 1 6 2 8 8 0 0
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