Agilent Technologies E8362A Service Manual page 119

PNA Series Microwave Network Analyzers
E8362A, E8363A, E8364A
5. If the signal is not present, replace the A10 frequency reference board. Refer to
"Removing and Replacing the A6, A8, and A10 Boards" on page
6. If the signal is present, reconnect cable W29, and continue testing at
through A34 Receiver Outputs" on page
Checking the A8 Fractional-N Synthesizer Band 1 Output
1. Refer to the block diagram at the end of this chapter and to
Locate the flexible cable W20, at the A8 fractional-N synthesizer board.
2. Disconnect W20 from A8J101.
3. Connect the spectrum analyzer to A8J101.
4. Set the network analyzer for a 500 MHz CW frequency and observe the spectrum
analyzer measurement.
• The spectrum analyzer should measure a signal at 508.333 MHz.
5. If the 508.333 MHz signal is not present and the 5 MHz reference signal is present from
"Checking the A10 5 MHz Reference Output,"
board. Refer to "Removing and Replacing the A6, A8, and A10 Boards" on page
6. If the signal is present, reconnect cable W20, and continue testing at
Fractional-N Synthesizer Band 2
Checking the A8 Fractional-N Synthesizer Band 2 Output
Perform this procedure if you observe a problem in band 2 in all receivers.
1. Refer to the block diagram at the back of this chapter and to
Locate semirigid cable W19, at the A8 fractional-N synthesizer board.
CAUTION Be careful not to damage the center pins of the semirigid cable. Some flexing
of the cable is necessary to measure the output. Do not over bend it.
2. Using a 5/16-inch torque wrench, disconnect W19 at A8J106.
3. Connect the spectrum analyzer to A8J106.
4. Set the network analyzer to a CW frequency of 1 GHz.
• The spectrum analyzer should measure a signal at 1.008 MHz.
5. If this signal is not present, replace the A8 fractional-N synthesizer board. Refer to
"Removing and Replacing the A6, A8, and A10 Boards" on page
6. If the signal is present, leave the spectrum analyzer connected to A8J106 and continue
testing at "Checking the A8 Fractional-N Synthesizer Bands 3 through 25
Checking the A8 Fractional-N Synthesizer Bands 3 through 25 Output
Perform this procedure if you observe a problem in bands 3 through 25 in all receivers.
1. Set the network analyzer to a CW frequency of 2GHz.
• The spectrum analyzer should measure a signal at 2.008GHz.
Service Guide E8364-90001
4-50.
replace the A8 fractional-N synthesizer
Output".
Troubleshooting
Measurement System Troubleshooting
7-18.
"Checking the A31
"Top Cables" on page
"Checking the A8
"Top Cables" on page
7-18.
Output".
6-24.
7-18.
6-24.
4- 41