Agilent Technologies E4440A, Service Manual

Page: 121 / 436

Chapter 5 121
Troubleshooting the Synthesizer Section
Verifying the A11 Reference Board
Measure the 10 MHz Rear Panel Output
6. Connect the spectrum analyzer to the 10 MHz Out (Switched) BNC
connector on the PSA rear panel. The 10 MHz signal amplitude
should be
+
6 dBm
±
2 dB.
Measure the 300 MHz Out at P4
7. Connect the spectrum analyzer to P4 on the reference assembly. The
300 MHz amplitude should be
−
27 dBm
±
2 dB.
Reference Assembly Detailed Troubleshooting
The reference assembly is placed on the E4440-60049 extender board so
additional signal levels can be measured.
1. Turn off the PSA and remove the reference assembly from the
instrument. Refer to Chapter 11 for removal procedures.
2. Place the reference assembly on the extender board and assure the
“4” cable (W16, 600 MHz Out) is connected to P3 on the reference
assembly.
3. Turn the instrument on and perform a factory preset.
Measure the 600 MHz Output to the Synthesizer Assembly
4. Connect a low loss SMA cable and SMA to SMB adapter between P1
(600 MHz) on the extender board and a spectrum analyzer. Set the
600 MHz switch on the extender board in the up position to connect
P1 to the 600 MHz output from the reference assembly. The
600 MHz signal should measure
−
11 dBm.
Measure the 10 MHz Signals to Other Assemblies
5. Measure the 10 MHz signal listed in the following table. Set the
switch controlling the jack to the up position.
Extender Board
Jack Designator Signal Level
P6 10 MHz CPU
+
6 dBm
P7 10 MHz FE driver
+
3 dBm
P5 10 MHz Option
+
3 dBm
P8 10 MHz AIF
+
3 dBm
P4 10 MHz Syn
+
3 dBm