Keysight Technologies N5244/5B Service Manual page 148

Troubleshooting
Measurement System Troubleshooting
4. Refer to
spectrum analyzer should be at 7.61 MHz (analyzers with DSP version
4.0), or 7.44 MHz (analyzers with DSP version 5.0), and 1 GHz.
5. If the measured signal is present, continue testing at
Multiplexer Board" on page
6. If the measured signal is missing on the R1 receiver, continue testing at
"Checking the A37 Reference Mixer Switch" on page
If the measured signal is missing on any receiver (other than the R1
receiver noted above) and the analyzer does not have receiver attenuators,
replace the A27 or A28 mixer brick, whichever is appropriate. Refer to
"Removing and Replacing the A27 and A28 Mixer Bricks" on page
If the measured signal is missing on the A, B, C, or D receivers and the
analyzer has receiver attenuators, continue testing at
A47, A48, and A49 35-dB Receiver Step Attenuators" on page
Checking the A37 Reference Mixer Switch
1. Remove the front panel REF 1 jumper and connect a spectrum analyzer to
the front-panel REF 1 SOURCE OUT connector.
2. If the measured signal is present, replace the A27 mixer brick. Refer to
"Removing and Replacing the A27 and A28 Mixer Bricks" on page
3. If the measured signal is not present, replace the A37 reference mixer
switch. Refer to
Switch" on page
Checking the A46, A47, A48, and A49 35-dB Receiver Step Attenuators
1. Locate the appropriate semirigid cable at the output of the receiver step
attenuator to be checked:
— Options 219, 224, 419, and 423
2. Disconnect the appropriate semirigid cable from the output of the step
attenuator.
3. Connect the spectrum analyzer to the open step attenuator connector. Set
the spectrum analyzer to measure a signal at 800 MHz.
4. If the 800 MHz signal is not present, replace the receiver step attenuator.
Refer to
the A46–A49 Receiver Attenuators" on page
4-54
the NOTE notice on page
4-55.
"Removing and Replacing the A37 Reference Mixer
7-55.
— Port 1; W98 of A46
— Port 2; W104 of A49
— Port 3; W100 of A47
— Port 4; W102 of A48
"Removing and Replacing the A38–A41 Source Attenuators and
4-31. The measured signal on the
"Checking the A24 IF
4-54.
"Checking the A46,
7-57.
Keysight N5244B/45B Service Guide
7-48.
4-54.
7-48.