Tektronix 371B Service Manual page 90

Maintenance
4-18
6. Install the A30 Connector board in the reverse order of removal.
Front Porch Chassis Mounted 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 High Current Power Supply Circuit Board. 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.
371B Service Manual