Maintenance
4-26
371B Service Manual
A25 Main Power Supply Board.
Perform the following to remove and install the
A25 Main Power Supply board.
1. Remove the top and rear panels from the 371B.
2. Remove J72, J190, J192, J194, J250, J252, J280, and J290 from the A25
board.
3. Remove the three screws that secure the A25 heat sink to the chassis.
4. Remove the remaining two screws that secure the A25 Main Power Supply
board to the chassis.
5. Lift the board from the main unit.
6. Replace the A25 Main Power Supply board in the reverse order of removal.
A26 Collector Power Supply Assembly.
The A26 Collector Power Supply
assembly consists of a transformer and a small circuit board. Perform the
following to remove and install the A26 Collector Supply assembly.
1. Remove the top, right and rear side panels.
2. Remove J64, J260, and J262 from the A26 Collector Power Supply
assembly.
3. Remove J276 from the A27 Primary board.
4. Remove the four screws that secure the A26 Collector Power Supply
assembly to the chassis (two on the bottom side rail and two on the floor of
the chassis).
5. Lift the A26 Collector Power Supply assembly from the main unit.
6. Replace the A26 Collector Power Supply assembly in the reverse order of
removal.
A27 Primary Board.
Perform the following to remove and install the A27 Primary
board.
1. Remove the rear panel from the 371B.
2. Remove the protective cover over the A27 Primary Circuit board by
crimping the tip of the plastic standoff and pulling the cover from board.
3. Remove J274 and J276 from the board.
4. Remove the three screws and two spacer posts from the board; lift the A27
Primary board from the rear panel.
5. Replace the A27 Primary board in the reverse order of removal.
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...
Page 280: ...371B Service Manual...
Page 287: ...371B Service Manual...
Page 288: ...371B Service Manual...
Page 289: ...371B Service Manual 6 5...
Page 290: ...371B Service Manual...