E8257D/67D, E8663D PSG Signal Generators Service Guide 351
Assembly Replacement
A31 Motherboard (E8267D)
A31 Motherboard (E8267D)
Tools Required
— T–10 driver
— 5/16” open–ended wrench
— needle–nose pliers
Removal Procedure
Refer to Figure 3-54 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 284, “A11 Pulse/Analog
Modulation Generator” on page 286, “A14 Baseband Generator (E8267D
Only)” on page 293, “A18 CPU” on page 298, 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:
— W67 from Rear Panel (.25–3.2 GHz COH CARRIER)
— W39 from A29 20 GHz Doubler J4
— W76 from A12 Pulse Modulator Board
7. Using the needle–nose pliers, disconnect the following flexible cables:
— W21 from A31J1043
— W10 from A31J1031
— W54 from A31J1032
— W47 from A31J1041
— W22 from A31J1042
— W60 from A31J1052
— W61 from A31J1053
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