Maintenance
4-22
371B Service Manual
A2, A3, A4, and A5 PlugĆIn Boards.
These circuit boards plug into the A1 Mother
board. Chapter 8: Diagrams and Component Locations shows their location in
the 371B.
1. Remove the top panel from the 371B.
2. Remove the two board retainer strips holding the boards in the card cage.
3. Pull-up on the ejector tabs at each end of the board to remove the board from
the card cage.
4. To install a plug-in board, perform the following:
a. Align the board with the alignment guide in its assigned slot (component
side away from the CRT). Insert it holding the tabs parallel to the top of
the board.
b. Slide the board down through the slots until the edge connectors rest on
the bus slot connectors on the A1 Mother board.
c.
Push the plug in card down into the bus slot connectors of the A1
Mother board. Press firmly on the board, but do not press on compo-
nents.
5. Replace the two circuit board retainers.
6. Install the top panel.
A1 Mother Circuit Board.
Perform the following to remove and replace the A1
Mother board.
1. Remove the top, left, and right side panels.
2. Remove the A2, A3, A4, and A5 boards from the main body as instructed in
the “A2, A3, A4, and A5 Plug-in Boards procedure.
3. Remove J10, J12, J110, J180, J190, J220, J400, J410, J412, and J420 from
the A1 Mother board.
4. Remove J60 from the A6 Collector Supply Output Circuit board (located at
left rear of 371B).
Remove J70 from the A7 Step Generator board.
Remove J192 from the A25 Main Power Supply board.
5. Remove the eight screws from the A1 Mother board.
6. Lift the A1 Mother board from the 371B.
7. Replace the A1 Mother 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...