Maintenance
371B Service Manual
4-3
Semiconductor Checks
Periodic checks of the semiconductors are not recommended. The best check of
semiconductor performance is actual operation in the instrument. More details on
semiconductors are given under “Troubleshooting” later in this chapter.
Periodic Electrical Adjustment
To ensure accurate measurements, check the electrical adjustment of this
instrument after each 2000 hours of operation or every 12 months if used
infrequently. In addition, replacement of components may necessitate adjustment
of the affected circuits. Complete adjustment instructions are given in Chapter
Four: Performance Check and Adjustment. Performing all or selected perfor-
mance checks and adjustments procedures can be helpful in localizing certain
troubles in the instrument and in some cases may correct them.
Troubleshooting
The following information is provided to facilitate troubleshooting the 371B:
Troubleshooting aids
Troubleshooting equipment
Troubleshooting techniques
Diagnostics
Information contained in other chapters of this manual should be used in
conjunction with the following data to aid in locating a defective component. An
understanding of the circuit operation is helpful in locating troubles. See Chapter
3: Theory of Operation, for this information.
Troubleshooting Aids
Diagrams.
Schematic diagrams are given on the pullout pages in Chapter 8:
Diagrams and Circuit Board Illustrations. Important voltages and numbered
waveform test points are also shown on the diagrams. Waveforms and the
numbered test points where each waveform was obtained are located adjacent to
each diagram. The portions of circuitry mounted on circuit boards are enclosed
with heavy solid-black lines.
Circuit Board Illustrations.
To aid in locating circuit boards, a circuit board
location illustration appears on the back of the pullout page that faces the
Summary of Contents for 371B
Page 4: ......
Page 14: ...Service Safety Summary 371B Service Manual...
Page 18: ...Preface 371B Service Manual...
Page 21: ...Specifications...
Page 22: ......
Page 24: ...Product Overview 371B Service Manual...
Page 38: ...Specifications 371B Service Manual...
Page 39: ...General Information...
Page 40: ......
Page 58: ...General Information 371B Service Manual...
Page 59: ...Theory of Operation...
Page 60: ......
Page 62: ...Theory of Operation 3 2 371B Service Manual Figure 3 1 371B Block Diagram...
Page 71: ...Maintenance...
Page 72: ......
Page 101: ...Performance Verification...
Page 102: ......
Page 220: ...Performance Verification 371B Service Manual...
Page 221: ...Options...
Page 222: ......
Page 226: ...Options and Accessories 371B Service Manual...
Page 227: ...Electrical Parts List...
Page 228: ......
Page 235: ...Diagrams...
Page 236: ......
Page 237: ...8 1 371B Service Manual Circuit Board Interconnections 2 2...
Page 238: ...371B Service Manual...
Page 239: ...8 3 371B Service Manual Circuit Board Interconnections 2 2...
Page 240: ...371B Service Manual...
Page 241: ...8 5 371B Service Manual Test Point Adjustment Locations 1...
Page 242: ...8 6 371B Service Manual Test Point Adjustment Locations 2...
Page 243: ...8 7 371B Service Manual Test Point Adjustment Locations 2...
Page 244: ...8 8 371B Service Manual Test Point Adjustment Locations 3...
Page 245: ...8 9 371B Service Manual Troubleshooting Tree...
Page 246: ...8 10 371B Service Manual Troubleshooting Tree Cont...
Page 247: ...8 11 371B Service Manual Troubleshooting Tree Cont...
Page 248: ...371B Service Manual...
Page 249: ...Mechanical Parts List...
Page 250: ......
Page 259: ...9 9 371B Service Manual Figure 9 1 Cabinet Rear 97 96 68...
Page 260: ...371B Service Manual...
Page 261: ...9 11 371B Service Manual Figure 9 2 Display Front 73...
Page 262: ...371B Service Manual...
Page 267: ...9 17 371B Service Manual Figure 9 3 Chassis Ciircuit Board...
Page 268: ...371B Service Manual...
Page 269: ...9 19 371B Service Manual Figure 9 4 Power Supply...
Page 270: ...371B Service Manual...
Page 276: ...Mechanical Parts List 371B Service Manual...
Page 277: ...9 27 371B Service Manual Figure 9 5 Test Fixture 78 78 REV MAR 96 75 72...
Page 278: ...371B Service Manual...
Page 279: ...9 29 371B Service Manual Figure 9 6 Front Porch...
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Page 289: ...371B Service Manual 6 5...
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