2-83
Assembly Replacement
A31 Motherboard (E8247C/57C)
A31 Motherboard (E8247C/57C)
Tools Required
• T-10 driver
• 5/16” open ended wrench
• needle-nose pliers
Removal Procedure
Refer to Figure 2-41 for this procedure.
1. Disconnect the power cord.
2. Remove the covers from the signal generator. Refer to "Outer Instrument Cover" on page 2-5
and "Inner Instrument Cover" on page 2-7.
3. Position the signal generator with the A31 Motherboard facing you and the RF deck on top.
4. Remove the front panel. Refer to "Front Panel" on page 2-9.
5. Remove the assemblies that are inserted into the A31 Motherboard. Refer to "A5 Sampler, A6
Frac-N, A7 Reference (Standard and Option UNR), and A8 Output" on page 2-22, "A9 YIG
Driver" on page 2-24, "A10 ALC" on page 2-27, "A11 Pulse/Analog Modulation Generator" on
page 2-29, "A14 Baseband Generator (E8267C Models Only)" on page 2-34, "A18 CPU" on page
2-39, and "A35 3-20 GHz I/Q Modulator (E8267C Models Only)" on page 2-96.
6. Using the 5/16” open ended wrench, disconnect the following RF cables:
• W40 from A29 20 GHz Doubler J3
• W39 from A29 20 GHz Doubler J4
• W37 from A23 Lowband Coupler/Detector
7. Using the needle-nose pliers, disconnect the following flexible cables:
• W21 from A31J1043
• W10 from A31J1031
• W11 from A31J1021
• W54 from A31J1032
• W47 from A31J1041
• W22 from A31J1042
8. Disconnect the W23 ribbon cable from the A21 Rear Panel Interface while removing the
A31 Motherboard from the chassis.
9. Disconnect the W35 ribbon cable from the A26 MID J10.
10.Using the T-10 driver, remove the 15 screws (1) that hold the A31 Motherboard to the chassis.
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