4-44 Service Guide E8361-90001
Troubleshooting PNA Series Microwave Network Analyzers
Measurement System Troubleshooting E8361A
Checking the A10 Phase Lock Reference Output, All Bands
1. Refer to the block diagram at the end of this chapter and “Top Cables, All Options
Except 080” on page 6-16. Locate flexible cable W44 at the A10 frequency reference
board.
2. Disconnect W44 from A10J5.
3. Connect the spectrum analyzer to A10J5.
4. Verify the presence of the 8.333 MHz phase lock reference output signal.
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 7-18.
6. If the signal is present, reconnect cable W44, and then continue with “Checking the 2nd
LO at the A10 Frequency Reference, All Bands” on page 4-44.
Checking the 2nd LO at the A10 Frequency Reference, All Bands
Perform this procedure if a problem is in one of the receiver channels and appears to be a
band related problem.
1. Refer to the block diagram at the end of this chapter and to “Top Cables, All Options
Except 080” on page 6-16. Locate the flexible cable W35 at the A10 frequency reference
board.
2. Disconnect the flexible cable W35 at A10J4.
3. Connect the spectrum analyzer to A10J4.
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 7-18.
6. If the signal is present, reconnect cable W35, and then go to “Checking the A31 through
A34 Receiver Outputs” on page 4-53.
Checking the A8 Fractional-N Synthesizer, Output Band 1
1. Refer to the block diagram at the end of this chapter and to “Top Cables, All Options
Except 080” on page 6-16. Locate the flexible cable W21, at the A8 fractional-N
synthesizer board.
2. Disconnect W21 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,” replace the A8 fractional-N
synthesizer board. Refer to “Removing and Replacing the A6, A8, A9, and A10 Boards”
on page 7-18.
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