Maintenance
371B Service Manual
4-15
c.
Remove J274 and J276 from the A27 Primary board.
d. Remove the A2 CPU and A3 A/D boards. Refer to the A2, A3, A4, and
A5 Plug-In boards procedures later in this chapter for removal instruc-
tions.
e.
Remove J220 from the A1 Mother board.
f.
Remove both ground wires that attach the rear panel to the main unit.
g. Replace the rear panel in the reverse order of removal.
. Procedures are provided later in this chapter for removing the A22
Interface board, the A27 Primary board, and the B100 Cooling Fan from the
rear panel. Refer to the applicable procedure as needed.
The following describes how to remove the drawer unit from the main unit. The
drawer unit should be completely removed from the main unit before attempting
to remove any associated assembly or chassis-mounted component.
Chapter 8: Diagrams and Component Locations, shows the location of related
electrical assemblies. Refer to the “Drawer Unit” and “Front Porch” drawings in
Chapter 9: Mechanical Parts for location of related chassis-mounted sub-assem-
blies and components.
Drawer Unit.
Perform the following to remove the drawer unit from the 371B.
1. Remove the right and left cabinet panels from the main unit.
The drawer unit is secured to the main unit using a long metal bracket on
each side.
2. Remove the eight screws (four flat-head and four round-head) that secure the
bracket to the main unit/drawer unit.
3. Pull the drawer unit forward away from the 371B.
You may have to place the fore and index fingers of each hand at the left-
and right-rear corners of the drawer unit. Then pry toward you with a slight
rocking motion to slide the drawer unit from the 371B.
. Before installing the mounting bracket (upon reassembly), make certain
that the bracket that contains potentiometer identification is installed on the
right side (the brackets are interchangeable).
Drawer Unit and
Associated Assemblies
and Components
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...