Service Guide N5227-90001 4-41
PNA Series Microwave Network Analyzers Troubleshooting
N5227A Measurement System Troubleshooting
Checking the A27 and A28 Mixer Brick Receiver Outputs
Set the network analyzer for an S
11
measurement with a CW frequency of 1 GHz.
1. Locate the following flexible cables at the receiver IF outputs of the mixer brick(s).
•2-port models
— Receiver A; W61 of A27
— Receiver R1; W62 of A27
— Receiver R2; W63 of A27
— Receiver B; W64 of A27
•4-port models
— Receiver A; W61 of A27
— 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
2. Disconnect the flexible cable at the suspect receiver.
3. Connect the spectrum analyzer to the suspect receiver connector.
4.
Refer to
the IMPORTANT notice on page 4-23
.
The measured signal on the 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
.
• If the measured signal is present, continue testing at “Checking the A24 IF Multiplexer Board” on
page 4-42.
5. If the measured signal is missing on the R1 receiver, continue testing at “Checking the A37 Reference
Mixer Switch” on page 4-41.
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 7-30.
If the measured signal is missing on the A, B, C, or D receivers and the analyzer has receiver attenuators,
continue testing at “Checking the A46, A47, A48, and A49 35-dB Receiver Step Attenuators” on
page 4-42.
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 7-30.
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