10 Installation Note E4400-90252
Assemble the Option UN9 (UN8 + UN9) rear panel
1. Attach the A17 rear-panel interface to the new Option UN9 (UN8 + UN9) rear panel with eight
washers and eight hex nuts. Torque to 21 in-lbs.
2. Assemble the COHERENT CARRIER connector to the rear panel using a washer and a hex nut.
Torque to 21 in-lbs.
3. Secure the COHERENT CARRIER cap and chain to the rear panel. Torque to 9 in-lbs.
4. Insert W15 into the rear-panel hole for the 13 MHz connector. Secure the cable using a washer and
a hex nut. Torque to 21 in-lbs.
5. Insert W16 into the rear-panel hole for the Q-OUT connector. Secure the cable using a washer and a
hex nut. Torque to 21 in-lbs.
6. Insert W17 into the rear-panel hole for the I-OUT connector. Secure the cable using a washer and a
hex nut. Torque to 21 in-lbs.
7. Insert three hole plugs into the three remaining rear-panel holes.
8. Reinstall the serial tag. Torque to 9 in-lbs.
9. Cut out single UN9 label and attach to the serial tag option location. This identifies the instrument
as having Option UN9 (UN8 + UN9) installed.
10. Reinstall the line module using the two flat-head screws. Make certain that the ground plug is
pointed down. Torque to 9 in-lbs.
11. Replace the nut that attaches the ground wire from the line module to the ground stud on the rear
panel. Torque to 9 in-lbs.
Install the Option UN9 (UN8 and UN9) rear panel
1. Reconnect the line module A16W1 to the power supply (A4).
2. Secure the new Option UN9 (UN8 + UN9) rear panel to the instrument chassis with the 10 screws.
Torque to 9 in-lbs.
3. Replace the hex screws on the AUXILIARY INTERFACE. Torque to 6 in-lbs.
4. Replace the hex screws and washers on the HP-IB connector. Torque to 9 in-lbs.
5. Replace the nuts and washers securing the BNC connectors at the base of the rear panel. Torque to
21 in-lbs.
6. Reconnect the nut connecting the COHERENT CARRIER cable (W12) to the rear panel. Torque to 9
in-lbs.
7. Reconnect the bracket at the rear of the instrument using the two screws.
8. Replace the bottom chassis cover with the 15 screws. Torque to 9 in-lbs.