Agilent Technologies E8362B Service Manual page 124

Troubleshooting
Measurement System Troubleshooting
4. Verify the presence of the 33.1667 MHz signal at A10J4.
5. If the signal is not present, replace the A10 frequency reference board. Refer to
"Removing and Replacing the A6, A8, A9, and A10 Boards" on page
6. If the signal is present, reconnect cable W29, and then go to
A34 Receiver Outputs" on page
Checking the A8 Fractional-N Synthesizer Band 0 and1 Output
1. Refer to the block diagram at the end of this chapter and to
Except 080" on page
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 508.33 MHz.
5. If the 508.33 MHz signal is not present and the 5 MHz reference signal is present from
"Checking the A10 5 MHz Reference Output, All Bands,"
synthesizer board. Refer to
on page 7-18.
6. If the signal is present, reconnect cable W20, and then continue with
Fractional-N Synthesizer Band 2 Output" on page
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
Except 080" on page
synthesizer board.
Be careful not to damage the center pins of the semirigid cable. Some flexing
CAUTION
of the cables is necessary to measure the output.
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 GHz.
5. If this signal is not present, replace the A8 fractional-N synthesizer board. Refer to
"Removing and Replacing the A6, A8, A9, and A10 Boards" on page
6. If the signal is present, leave the spectrum analyzer connected to A8J106 and continue
with "Checking the A8 Fractional-N Synthesizer Band 3 through 25 Output" on
page 4-43.
4-42
4-51.
6-14. Locate the flexible cable W20, at the A8 fractional-N
"Removing and Replacing the A6, A8, A9, and A10 Boards"
6-14. Locate semirigid cable W19, at the A8 fractional-N
PNA Series Microwave Network Analyzers
E8362B, E8363B, E8364B
7-18.
"Checking the A31 through
"Top Cables, All Options
replace the A8 fractional-N
"Checking the A8
4-42.
"Top Cables, All Options
7-18.
Service Guide E8364-90026