E8257D/67D, E8663D PSG Signal Generators Service Guide 361
Assembly Replacement
Rear Panel (Standard)
8. Using the 5/16” open–ended wrench, disconnect the following cables:
— W67 (.25–3.2 GHz COH CARRIER) from the Rear Panel (E8267D
only).
— (1 GHz Out) from the Rear Panel.
9. Disconnect the following ribbon cables:
— W64 from A17P2 (E8267D only)
— W90 from A17P1 (E8267D only)
— W20 from A20 SMI J1
— W18 from A21 Rear Panel Interface J3
— W23 from A21 Rear Panel Interface J2
— W136 from A40 Compact Flash PCA (if Option 008/009 is installed)
10.If the signal generator has option UNR/UNX, disconnect the W48 flexible
cable from A32 10 MHz Crystal Oscillator (Option UNR/UNX).
11.Using the T–10 driver, remove the eleven screws (1) that secure the Rear
Panel to the instrument chassis.
12.Using the needle–nose pliers, disconnect A22W1 from the power supply.
13.Using the T–10 driver, remove the screw securing the A22W2 to the A19
Power Supply.
14.Disconnect the B1 Fan cable from the A31 Motherboard P251.
15.Pull the rear panel away from the signal generator’s chassis.
Replacement Procedure
— Reverse the order of the removal procedure.
— Torque all T–10 screws to 9 in–lbs.
— Torque all RF connectors to 8 in–lbs.
— Perform the post–repair adjustments and performance tests that pertain to
this removal procedure.
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