Chapter 11 335
Assembly Replacement Procedures
RF Section E4440A, E4443A, E4445A
then unsolder the jumper wires from the bottom switch. Avoid
damage to the wires since they have little service length.
9. Remove the switch mounting screws being careful to keep track of
the two standoffs between the switches.
Bottom Switch Replacement
1. Position the replacement bottom switch on the switch bracket.
2. Pre-form the black jumper wires on the top switch for easier
installation. Also inspect all solder connections.
3. Position the standoffs over the mounting holes and insert the
mounting screws. Slightly tighten the screw close to the front of the
instrument. Leave the screw close to the fan resting on the switch
bracket, but with no threads engaged.
4. Rotate both switches toward the front of the instrument.
5. Solder the jumper wires.
6. Rotate the switches to their normal position and tighten the
mounting screws.
7. Refer to Figure 11-16. Install W82 from the dual mixer to the bottom
switch port 2. Torque to 10 in-lbs
8. Refer to Figure 11-17. Install W80 from the attenuator to the bottom
switch port C.
9. Install W81. Torque to 10 in lbs.
10.Refer to Figure 11-17. Install W84, W86 and W87 on the top switch.
Note that two of the cables have identification bands that correspond
to the connector designator 1, or 2, printed on the switch from the
top switch.
11.Replace the front panel.
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