Maintenance
4-18
371B Service Manual
6. Install the A30 Connector board in the reverse order of removal.
Front Porch ChassisĆMounted Components.
The Front Porch assembly contains
several chassis-mounted subassemblies and components. Refer to the Front
Porch Assembly drawing in Chapter 9: Mechanical Parts for location of these
subassemblies and components. The Front Porch assembly must be removed in
order to access these chassis-mounted subassemblies and components.
A31 Relay Board.
Perform the following to remove the A31 Relay board.
1. Remove the drawer unit from the 371B.
2. Remove the shield (four screws) that covers the A31 Relay board and the
A15 High-Current Control board.
3. Remove the Front Porch assembly as described earlier in this chapter. Pull
the Front Porch away from the drawer unit slightly to access the A31 Relay
board.
4. Remove J914 and J695 from the A31 Relay board.
5. Remove the eight screws that secure wires to J920, J921, J924, J926, J928,
J932, and J934.
6. Remove the 10 screws that secure the A31 Relay board to the drawer unit
chassis.
7. Lift the A31 Relay board from the drawer unit.
8. Install the A31 Relay board in the reverse order of removal.
A15 HighĆCurrentPower Supply CircuitBoard.
Perform the following to remove
the A15 High Current Power Supply board.
1. Remove the drawer unit from the main unit.
2. Remove the shield (four screws) that covers the A31 Relay board and the
A15 High Current Control board.
3. Remove J800, J802, J804, J900, J902, J904, and J906 from the A15 board.
4. Remove the eleven screws that secure the A15 board to the drawer unit
chassis.
5. Lift the A15 High Current Power Supply board from the drawer unit.
6. Install the A15 High Current Power Supply 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...