Chapter 4 185
Assembly Replacement
Procedure 2. A1 Front Frame/A18 LCD
Removal of the Keyboard
1. Disconnect cable A1A1W1 from HDR1 on the A1 front panel
assembly and from A3J602 on the A3 interface board.
2. Disconnect the power probe cable from the probe power connector on
the front frame PC board.
3. Unhook the RPG cable.
4. Remove the seven screws (0515-1934) that secure the front frame PC
board to the front frame. Use a T-8 TORX driver set to 6-in/lbs.
Replacement of the Front Frame
1. Remove the cover assembly as described in “Procedure 1. Spectrum
Analyzer Cover.” Place the instrument on its side, with the display
section upper-most, as shown in Figure 4-1 on page 179.
2. Fold out the A14 and A15 assemblies as described in steps 3 through
4 under“Procedure 8. A14 and A15 Assemblies.” Facing the front
panel, the A14, and A15 assemblies will lie to your right.
3. Fold out the A2, A3, A4, and A5 assemblies as described in steps 2
through 6 under “Procedure 5. A2, A3, A4, and A5 Assemblies.”
Facing the front panel, the A2, A3, A4, and A5 assemblies will lie to
your left.
4. Place the A1 front frame assembly in the chassis of the instrument.
a. Position the A1 front frame assembly in the chassis.
b. Insert the three screws (0515-1101) that secure the front frame
chassis to the bottom of the spectrum analyzer.
c. Insert the three screws (0515-1101) that secure the front frame
chassis to the top of the spectrum analyzer
d. Insert the screw (0515-1227) that secures the top of the
attenuator to the inside of the A1 front frame assembly.
5. Secure the following connectors to the inside of the A1 front panel
assembly.
a. INPUT 50 Ω RF connector. Use a 5/16-inch open-end wrench to
connect cable W41 to the front panel from the attenuator.
b. RF OUT 50 Ω connector for Option 002 spectrum analyzers. Use a
5/16-inch open-end wrench to connect cable W47 to the front
panel.
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