Keysight Technologies N5224A Service Manual page 117

Troubleshooting
Measurement System Troubleshooting
2. Disconnect the flexible cable at the suspect receiver.
3. Connect the spectrum analyzer to the suspect receiver connector.
4. Refer to Note on
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 and 419
Keysight N5224A/25A Service Guide
— Receiver R1; W62 of A27
— Receiver R2; W63 of A27
— Receiver B; W64 of A27
— Receiver C; W68 of A28
— Receiver R3; W67 of A28
— Receiver R4; W66 of A28
— Receiver D; W65 of A28
page 4-28. The measured signal on the spectrum
4-46.
"Removing and Replacing the A37 Reference Mixer
7-43.
— Port 1; W98 of A46
"Checking the A24 IF
4-45.
7-36.
"Checking the A46,
4-45.
7-36.
4-45