Intergraph TD-x10 System Reference Manual page 38

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MIDI
7. Disconnect the cables from the external ports.
8. Using a three-sixteenth-inch nutdriver, remove the jackscrews from the video, parallel, and serial
ports.
9. Using an 8 mm or five-sixteenth-inch nutdriver, remove the hex nuts from the audio jacks.
Audio
Jacks
10. Using a quarter-inch nutdriver, remove the eight grounding screws from the system board.
11. Slide the system board to the front of the base unit.
12. Lift the board and remove it from the base unit. Set the board on a flat antistatic surface.
Internal SCSI
Audio
ISA Bus
Floppy Cable
Connector
Serial Parallel
Ports Port
Speaker
Reset
Fan
Assembly
Power
Video
Port