Maintenance
4-4
371B Service Manual
appropriate schematic diagram. In addition, the circuit board illustrations are
included that show the physical location of the waveform test points that appear
on the schematic diagram.
Troubleshooting Charts.
Troubleshooting charts are given in Chapter 8: Diagrams
and Circuit Board Illustrations, to aid in locating a defective circuit. The shaded
blocks on the troubleshooting charts indicate circuits that may cause the
indicated malfunction. The circuits listed are discussed in detail in Chapter 3:
Theory of Operation.
Adjustment and Test Point Location.
To aid in locating test points and adjustable
components called out in the various portions of the adjustment procedure, the
“Adjustment and Test Point Locations” pullout pages appear in Chapter 8:
Diagrams and Circuit Board Illustrations.
The following equipment is useful for troubleshooting the 371B.
1. Transistor Tester
Description:
Dynamic tester
Purpose:
Tests semiconductors.
Recommended type:
SONY/Tek 370B Programmable Curve Tracer
2. Digital Multimeter
Description:
10 M
W
input impedance and0 to 1 kV range, AC andDC;
ohmmeter, accuracy, within 0.1%. Test probes must be
insulatedto prevent accidental shorting.
Purpose:
Checks voltages andresistances.
Recommended type:
Tektronix DM501A Digital Multimeter
3. Test Oscilloscope
Description:
Frequency response, DC to 150 MHz minimum; deflection
factor, 2 mV to 5 V/division. A 10X, 10 M
W
voltage probe
shouldbe usedto reduce circuit loading for voltage
measurements.
Purpose:
Checks operating waveforms.
Recommended type:
Tektronix 2445B Oscilloscope
Troubleshooting
Equipment
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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