Agilent Technologies 85032B/E 50 Specifiche Pagina 132

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Assembly Replacement 8712ET/ES and 8714ET/ES
A5 Receiver Assembly Component Replacement RF Network Analyzers
3-14 Service Guide
5. Remove the front panel assembly (see “Removing the Front Panel Assembly” on page
3-4). Remove the handle nut plate on the right side only.
6. Two semirigid cables connect the A5 assembly to the A4 assembly. Completely loosen
one nut on each cable where it connects to the A4 assembly, then separate the cable
from the A4 assembly.
7. Grasp the handle tab and pull forward to release the assembly. Once released, the
assembly will easily slide out of its cavity.
NOTE If one or both RF port connectors are damaged, you must replace the plate
that contains both connectors. Do not attempt to replace a single connector by
itself. These connectors have been machine-pressed into the plate to prevent
undesired rotation. It is not possible to duplicate this in the field. This plate
assembly can be replaced separately.
Removing the Individual Components from the A5 Receiver Assembly
After the receiver assembly is removed from the instrument, individual components can be
accessed. Follow the special assembly instructions in these sections:
Removing the Receiver PC Board
Removing the Coupler
Removing the Switch (ES Analyzers)
Removing the Attenuator (ES and Option 1E1 Analyzers)
Removing the Limiter (ET Analyzers)
Removing the Receiver PC Board.
NOTE The ET Option 1E1 and ES models have an attenuator board. A short ribbon
cable connects the receiver board to the attenuator board. After the receiver
board is removed you will want to transfer the attenuator ribbon cable to the
new receiver board. The standard ET models do not have this board or ribbon
cable.
1. From the attenuator board, disconnect at J1 the ribbon cable that connects to the
receiver board.
2. On the receiver board, loosen and lift the four semirigid cables off the
connectors J1 (LO IN), J2 (R RF IN), J3 (A RF IN), and J4 (B RF IN).
3. Remove the six screws that connect the frame to the main PC board. These screws are
located just inside of the long metal frame. There are three screws on each side.
4. Carefully separate the receiver PC board from the mainframe.
5. Disconnect the attenuator ribbon cable from the old receiver board. Set the cable aside
to be used with the new receiver board.
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