306 E8257D/67D, E8663D PSG Signal Generators Service Guide
Assembly Replacement
A21 Rear–Panel Interface
A21 Rear–Panel Interface
Tools Required
— T–10 driver
— 9/16” hex–nut driver
— 5.0 mm hex–nut driver
— 7.0 mm hex–nut driver
— needle–nose pliers
Removal Procedure
Refer to Figure 3-27 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. Remove the rear panel. Refer to “Rear Panel (Standard)” on page 360 or
“Rear Panel (Option 1EM)” on page 363.
4. Using the 9/16” hex–nut driver, remove the nuts and washers securing the
six BNC
connectors (1) at the base of the rear panel.
5. Using the 5.0 mm hex–nut driver, remove the screws (2) from the RS–232
port.
6. Using the 7.0 mm hex–nut driver, remove the screws (3) from the GPIB
port.
7. Using the T–10 driver, remove the two screws (4) from the bottom of the
A21 Rear Panel Interface.
8. Disconnect the B1 Fan cable (5) from A31P251.
9. If you have Option UNR/UNX, disconnect the A32 10 MHz Crystal
Oscillator (Option UNR/UNX) cable from A21P2.
10.Remove the A21 Rear Panel Interface.
Replacement Procedure
1. Reverse the order of the removal procedure.
2. Torque all T–10 screws to 9 in–lbs.
3. Torque all hex–nuts to 9 in–lbs.
4. Torque all BNC nuts to 21 in–lbs.
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