Step 1. Remove the blower cover. Remove three screws from the top of the cover and two screws on the sides. Tilt the cover up and slide it out.

Step 2. Remove the top cover of the GPIB board. Remove the three screws along side the unit. Remove the screw at the end of the cover that attaches the cover to the pc board.

Step 3. Remove the binding post (1) from the rear of the chassis.
3

2

1

Step 4. Crimp the appropriate ring terminal (2) onto the end of the ground wire. Step 5. Place the ring terminal onto the threaded end of the binding post. Reinstall the binding post on the chassis with the washer and nut (3). Step 6. Rotate the ring terminal so that the ground wire does not interfere with any other connectors on the back of the unit. Tighten the binding post to the chassis. Torque for N6700A mainframes = 15 – 20 in-lb. Torque for N6700B mainframes = 20 – 25 in-lb. Step 7. Reassemble the mainframe. Step 8. Attach the 400 Hz label to the top of the unit. Place the label above the existing label that is closest to the AC input connector.