Maintenance
371B Service Manual
4-17
6. Remove the six screws that secure the A10 Sense board to the drawer unit
chassis.
7. Lift the A10 Sense board from the drawer unit.
8. Install the A10 Sense board in the reverse order of removal.
Front Porch Assembly.
The Front Porch assembly must be unfastened from the
drawer unit in order to access the A30 Connector board and various chassis–
mounted components.
1. Remove the shield (four screws) that covers the A16 High-Current Control
and A31 Relay boards.
2. Remove the 5/16 inch nut that attaches the Front Porch assembly to the
center brace of the drawer unit.
3. Remove the three screws from each side of the drawer unit.
Tilt the Front Porch assembly up and back to access the A30 Connector
board and chassis-mounted components. Be careful not to stretch the cabling
between the Front Porch and other drawer unit assemblies.
4. Install the Front Porch assembly in the reverse order of removal.
A30 Connector Board.
The A30 Connector board is fastened to the underside of
the Front Porch panel.
1. Unfasten the Front Porch assembly from the drawer unit as previously
described.
2. Tilt the Front Porch assembly up and back to access the A30 Connector
board. Be careful not to stretch the cabling between the Front Porch and
other drawer unit assemblies.
3. Remove the nuts at J700, J702, J704, J706, J708, J710, J712, J714, J716,
and J720 on the A30 board.
. Several of the above nuts are used to attach wiring to the connectors. Be
sure to tag such wires to identity their location to ensure proper placement upon
re-assembly.
4. Two cable assemblies, W622 and W632 are hardwired to the A30 Connector
board. Remove these cables at J622 and J632, respectively, on the A10 Sense
board. Remove the cables from the chassis clamps.
5. Remove the A30 board from the Front Porch assembly.
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...