Agilent Technologies N5230A Service Manual page 110

Troubleshooting
Measurement System Troubleshooting
Checking the A6 Multiplier Output, All Bands
1. Refer to the block diagram at the end of this chapter and to
page 6-12. Locate the flexible cable W3, at the A6 multiplier board.
2. Disconnect W3 from the A6 board.
3. Connect the spectrum analyzer to the open connector.
4. Set the network analyzer for a 2 GHz CW frequency and observe the spectrum analyzer
measurement.
• The spectrum analyzer should measure a signal at approximately 2 GHz.
5. If the signal is not present and the signals are present from
Fractional-N Synthesizer Output, Bands 5–12,"
to "Removing and Replacing the A5 through A10 Boards" on page
6. If the signal is present, reconnect cable W3, and then continue with
Fractional-N Synthesizer Output, Bands 0–3" on page
Checking the A9 Fractional-N Synthesizer Output, Bands 0–3
1. Refer to the block diagram at the end of this chapter and to
page 6-12. Locate the flexible cable W5, at the A9 fractional-N synthesizer board.
2. Disconnect W5 from A9J101.
3. Connect the spectrum analyzer to A9J101.
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 500 MHz.
5. If the signal is not present and the 5 MHz reference signal is present from
the A10 5 MHz Reference Output, All Bands,"
board. Refer to "Removing and Replacing the A5 through A10 Boards" on page
6. If the signal is present, reconnect cable W5, and then continue with
Fractional-N Synthesizer Output, Band 4" on page
Checking the A9 Fractional-N Synthesizer Output, Band 4
Perform this procedure if you observe a problem in band 4 in all receivers.
1. Refer to the block diagram at the back of this chapter and to
on page 6-12. Locate semirigid cable W4, at the A9 fractional-N synthesizer board.
CAUTION Be careful not to damage the center pins of the semirigid cable. Some flexing
of the cables is necessary to measure the output.
2. Using a 5/16 inch torque wrench, disconnect W4 at A9J106.
3. Connect the spectrum analyzer to A9J106.
4. Set the network analyzer to a CW frequency of 1 GHz.
• The spectrum analyzer should measure a signal at 1 GHz.
4-40
PNA Series Microwave Network Analyzers
"Top Cables, All Options" on
"Checking the A7
replace the A6 multiplier board. Refer
7-16.
4-40.
"Top Cables, All Options" on
replace the A9 fractional-N synthesizer
4-40.
"Top Cables, All Options"
Service Guide N5230-90014
N5230A
"Checking the A9
"Checking
7-16.
"Checking the A9