Tektronix 371B, Service Manual

Page: 95 / 292

Maintenance
371B Service Manual
4-23
A6 Collector Supply Output Board.
Perform the following to remove the install the
A6 Collector Supply Output board.
1. Remove the top, rear, and left side panels.
2. Remove the electrical shield over the A6 board.
3. Remove J60, J62, and J66 from the board.
4. Remove J64 from the A26 Collector Power Supply board.
5. Remove the four screws that secure the heat sink of the A6 board to the
chassis.
6. Remove the two screws that secure the A6 Collector Supply Output board to
the chassis and remove the board from the main unit.
7. Install the A6 Collector Supply Output board in the reverse order of removal.
If you have removed Q438, Q440, Q538, and Q540 from the heat sink,
upon reassembly, make sure that all four insulation washers are placed in
position. Without these insulator, destructive electric short circuits will occur.
. Do not apply silicon grease to the insulation washers. No grease is
required because of the high heat conductivity of the insulation washers.
A7 Step Generator Circuit Board.
Perform the following to remove and install the
A7 Step Generator board.
1. Remove the top, rear, and right side panels from the 371B.
2. Remove J70, J72, J74, J76, and J78 from the A7 board.
3. Remove the three screws located on the lower side of the A7 Step Generator
board.
4. Remove the three screws that fasten the heat sink of the A7 Step Generator
board to the chassis. Support the board as these screws are removed so it
does not fall and become damaged.
5. Remove the A7 Step Generator board from the 371B.
6. Replace the A7 Step Generator board in the reverse order of removal.