Tektronix 371B, Service Manual

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Maintenance
4-16
371B Service Manual
4. Install the drawer unit in the reverse order of removal.
A24 Floppy Disk Driver.
The Floppy Disk Drive (FDD) unit with mounting
bracket is secured to the drawer unit with four screws. Note that the bracket
mounting holes are slotted to allow the FDD to be aligned flush with its front
panel bezel.
1. Remove the connector from the rear of the FDD.
2. Remove the four screws the secure the mounting bracket to the drawer unit.
3. Push the FDD to the rear, away from its front bezel, and remove the FDD
from the drawer unit.
4. If replacing the FDD with a new unit, remove the mounting bracket from the
FDD (four screws) and install the bracket on the new FDD.
5. Install the A24 FDD in the reverse order of removal.
A23 FDD Interface Circuit Board.
Remove and replace the A23 FDD Interface
circuit board as follows:
1. Pull out the drawer unit from the main body of the 371B.
2. Remove the connector for J100 from the A13 Key Interface circuit board.
3. Remove the connector (through the W200 on the A23 FDD Interface circuit
board) from the FDD assembly.
4. Remove the A23 FDD Interface circuit board by removing the four securing
screws from the board.
5. Replace the A23 FDD Interface circuit board in the reverse order of removal.
A10 Sense Circuit Board.
Remove and install the A10 Sense board as follows:
1. Pull out the drawer unit from the 371B.
2. Remove J140, J146, J142, and J148 from the A14 Lower Key and FDD
board.
3. Remove the six screws that secure the support bracket for the A24 FDD
assembly and the A14 Lower Key and FDD board to the drawer unit chassis.
4. Remove the bracket with the A24 FDD and A14 Lower Key and FDD board
assemblies attached.
5. Remove the following connectors from the A10 Sense board: J670, J146,
J612, J614, J690, J610, J617, J616, J620, J695, J630, J632, J626, J622,
J618, J634, and J636.