Maintenance
4-2
371B Service Manual
Avoid the use of chemical cleaning agents that might damage the
plastics in this instrument. Use a non-residue type of cleaner, preferably
isopropyl alcohol or totally denatured ethyl alcohol. Before using any other type
of cleaner, consult your Tektronix service center or field representative.
Loose dust accumulated on the outside of the instrument can be removed with a
soft cloth or small brush. The brush is particularly useful for dislodging dirt on
and around the front-panel controls. Dirt that remains can be removed with a soft
cloth dampened in a mild detergent and water solution. Abrasive cleaners should
not be used.
Inspect and clean the air filter periodically to maintain cooling air flow. Remove
the filter retainer (remove four attaching screws) from the rear of the 371B. Wash
the filter in soapy water, rinse, dry, and replace on the 371B.
Clean the plastic light filter, implosion shield, and the CRT faceplate with a soft,
lint-free cloth dampened with denatured alcohol.
Cleaning the interior of the instrument should only be necessary occasionally.
The best way to clean the interior is to blow off the accumulated dust with dry,
low-velocity air (approximately 5 lbs/sq in). Remove any dirt that remains with a
soft brush or a cloth dampened with a mild detergent and water solution. A
cotton swab is useful for cleaning in narrow spaces or for cleaning more delicate
circuit components.
Circuit boards and components must be dry before applying power to
prevent damage from electrical arcing.
The high-voltage circuit should receive special attention. Excessive dirt in this
area may cause high-voltage arcing and result in improper instrument operation.
Visual Inspection
The 371B should be inspected occasionally for such defects as broken connec-
tions, improperly seated semiconductors, damaged or improperly installed circuit
boards, and heat-damaged parts. The corrective procedure for most visible
defects is obvious; however, particular care must be taken if heat-damaged parts
are found. Overheating usually indicates other trouble in the instrument;
therefore, correcting the cause of overheating is important to prevent recurrence
of the damage.
Exterior
Air Filter
CRT
Interior
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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