Maintenance
2715 Spectrum Analyzer Service Manual 6-27
Use the following procedure to replacethe 1st LO Buffer Amplifier:
NOTE. Replacement of this assembly requirescompletion of the. Amplitude
Flatness Adjustment Procedure on Page 5-- 52.
1. Remove the instrument from its cabinet(see Removing the Instrument from
its Cabinet on Page 6--17).
2. Remove the RF Deck from th e Spectrum Analyzer (see Replacing the RF
Deck on Page 6--23).
3. Disconnect P100 and P380 from the 1st LO BufferAmplifier assembly.
4. Remove the Step Attenuator (see the previous step Replacing the Step
Attenuator).
5. Remove two 1/4Inuts and a screw holding the 1st LO Buffer Amplifier in
place. The screw is located in t he corner of the 1st Converter assembly.
6. Remove the 1st LO Buffer Amplifier assembly from the RF deck.
Replace the assembly by reversingthe removal procedure.
Refer to Figure 6-- 10 for the following removal procedurefor the fan:
1. Remove the instrument from its cabinet(see Removing the Instrument from
its Cabinet on Page 6--17).
2. Position the instrument with the rear ofthe instrument facing the installer.
3. Remove the fan shroud by removing thetwo 4-40 nuts.
4. Remove the fan connector.
5. Remove the fan and mounting springs by removingthe four 4-40 Pozidriv
screws. The fan becomesfree with the mounting springs still attached.
6. Remove the two 6-32 mounting screws (andnuts) to separate the mounting
springs from the fan.
Replacing the 1st LOBuffer AmplifierReplacing the Fan
Assembly