348 E8257D/67D, E8663D PSG Signal Generators Service Guide
Assembly Replacement
A31 Motherboard (E8257D & E8663D)
A31 Motherboard (E8257D & E8663D)
Tools Required
— T–10 driver
— 5/16” open–ended wrench
— needle–nose pliers
Removal Procedure
Refer to Figure 3-53 for this procedure.
1. Disconnect the power cord.
2. Remove the covers from the signal generator. Refer to “Outer Instrument
Cover” on page 258 and “Inner Instrument Cover” on page 260.
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 262.
5. Remove the assemblies that are inserted into the A31 Motherboard. Refer
to “A5 Sampler, A6 Frac–N, A7 Reference (Standard and Option
UNR/UNX/UNY), A8 Output, A45 Frac-N and A46 Offset” on page 279, “A9
YIG Driver” on page 281, “A10 ALC” on page 283, “A11 Pulse/Analog
Modulation Generator” on page 285, “A14 Baseband Generator (E8267D
Only)” on page 293, “A18 CPU” on page 297, and “A13 I/Q MUX (E8267D
Standard or with Option 015) (Serial Prefixes <US4722/MY4722)” on
page 289.
6. Using the 5/16” open–ended wrench, disconnect the following RF cables:
— W40 from A29J3
— W39 from A29J4
— W37 from the A23 Lowband Coupler/Detector
— W137 from W121
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
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