
Assembly Replacement 8712ET/ES and 8714ET/ES
A5 Receiver Assembly Component Replacement RF Network Analyzers
3-16 Service Guide
Installing the Coupler.
1. Make sure the new coupler is of the correct impedance (50Ω or 75Ω) for the analyzer.
2. Inspect all the connectors and the semirigid cables for damage.
3. Reverse the procedure used to remove the coupler.
4. Tighten the semirigid cable connectors to 10 in-lb of torque.
Removing the Switch (ES Analyzers).
1. Disconnect the 3-wire power/control cable from the J3 connector on the attenuator PC
board.
2. With the special shaved wrench, loosen and lift the two outside cables off the switch
3. Loosen and remove the center cable from the switch and the attenuator.
4. Loosen and remove the two screws that attach the switch to the attenuator PC board.
Installing the Switch.
NOTE Make sure the center semirigid cable is routed under the adjacent cable. See
item 23 in the illustration on page 7-14, for a visual representation of the
cable.
1. Inspect all the connectors and the semirigid cables for damage.
2. Reverse the procedure used to remove the switch.
3. Tighten the semirigid cable connectors to 10 in-lb of torque.
CAUTION To prevent damage to the power-control cable when sliding the receiver
assembly into the chassis, route the excess 3-wire cable under the nearby
semirigid cable.
Removing the Attenuator (ES and Option 1E1 Analyzers).
1. Disconnect the two semirigid cables from the attenuator. On ES models, loosen and
disconnect the three cables from the switch as in the procedure “Removing the Switch
(ES Analyzers)” on page 3-16.
2. Disconnect the ribbon cable at J1 on the attenuator PC board.
3. Reroute the excess length of 3-wire cable so that it is above the adjacent semirigid
cabling.
4. Remove the four corner screws of the attenuator PC board. Carefully lift the board out
of the assembly taking care not to damage any pins or cables.
5. Disconnect the smaller ribbon cable from J2 on the attenuator PC board.
6. Lay the board with attenuator on a flat surface. Remove the two screws that fasten the
attenuator to the bottom of the board.
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