Keysight N5227B, Service Manual

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Keysight N5227B Service Guide 4-47
Troubleshooting
Measurement System Troubleshooting
3. Remove the outer and inner covers from the analyzer. Refer to “Removing
the Covers” on page 7-6 .
4. With the covers off, plug in the analyzer and turn on the power.
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 Note on page 4-29 . 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.
Procedures described in this document are performed with power
supplied to the product while protective covers are removed. Energy
available at many points may, if contacted, result in personal injury.
Do not operate the analyzer with the outer cover removed for more than
30 minutes, as this could cause the analyzer to overheat which could
result in costly damage.