598 Chapter12
RF Section
Troubleshooting Using the Diagnostic Software
CAUTION Use of an active probe, such as an 85024A, with another spectrum
analyzer is recommended for troubleshooting the RF circuitry. If an
1120A Active Probe is being used with a spectrum analyzer, such as the
8566A/B, 8569A/B and the 8562A/B, having dc coupled inputs, either
set the active probe for an ac coupled output or use a dc blocking
capacitor (11240B) between the active probe and the spectrum analyzer
input. Failure to do this can result in damage to the spectrum analyzer
or to the probe.
Table 12-1 Procedures To Use For Isolating Faults
Suspected Faulty Circuit Manual Procedure to Perform
2nd IF Amplifier Third Converter
2nd IF Distribution Third Converter
10.7 MHz IF Out of Double Balanced Mixer Third Converter
300 MHz CAL OUTPUT 8. Calibrator Amplitude Adjustment in
Chapter 3
A7 LO Multiplier and Distribution Amplifier A7 LO Multiplier and Distribution
Amplifier
A8 Low Band Mixer A8 Low Band Mixer
A9 Input Attenuator A9 Input Attenuator
A13 Second Converter A13 Second Converter
A13J2 INT 2nd IF A13 Second Converter (steps 1 to 6)
A14 Latch Control Latch for Band-Switch Drivers
A15 Control Latches Control Latch for Band-Switch Drivers
A15J601 10.7 MHz Third Converter
External 10 MHz Reference Operation
10 MHz Reference (steps 5 to 11)
Gain of Flatness Compensation Amplifier Third Converter
INT 10 MHz Reference Operation
10 MHz Reference (steps 1 to 4)
LO Feedthrough
Low Band Problems (steps 1 to 3)
LO Power Low and High Band Problems
(steps 4 to 9)
PIN Switches in SIG ID Oscillator (Opt 008) SIG ID Oscillator (Option 008)
Second Converter Control A13 Second Converter
SIG ID Oscillator (Opt 008) Signal ID Oscillator Adjustment in
Chapter 3
SIG ID Oscillator Operation (Opt 008) SIG ID Oscillator (Option 008))
Third Converter Low and High Band Problems (step 10)
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