Keysight Technologies N5224A Service Manual page 114

Troubleshooting
Measurement System Troubleshooting
Equipment Used for These Tests
Equipment Type
Spectrum analyzer
a. Must be capable of measuring a signal at 1 GHz.
To determine which assembly is defective, check the signal at each available
measurement point in the signal path from the output of the source board to
the output port.
Set the network analyzer for an S
3, or 4 respectively, with a CW frequency of 800 MHz.
Perform the following checks in the order presented.
Checking the A29, A30, A31, and A32 Receiver Couplers
1. Locate the appropriate semirigid cable at the output of the receiver
coupler to be checked:
— Options 200 and 400
— Options 219 and 419
2. Using a 5/16-inch torque wrench, disconnect the semirigid cable at the
receiver coupler.
3. Connect the spectrum analyzer to the open receiver coupler connector.
Set the spectrum analyzer to measure a signal at 800 MHz.
4. If the 800 MHz signal is not present and the analyzer does not have
mechanical switches, replace the receiver coupler. Refer to
and Replacing the A29–A32 Receiver Couplers and Receiver Coupler
Mounting Brackets" on page
5. If the 800 MHz signal is present and the analyzer has source attenuators
and bias tees, reconnect the cable to the receiver coupler and continue
testing at
Attenuators" on page 4-43
4-42
11, S22, S33, or S44,
— Port 1; W19 of A29
— Port 2; W31 of A32
— Port 3; W23 of A30
— Port 4; W27 of A31
— Port 1; W81 of A29
— Port 2; W93 of A32
— Port 3; W85 of A30
— Port 4; W89 of A31
7-38.
"Checking the A38, A39, A40, and A41 60-dB Source Step
Model or Alternate Model or Part
Part Number Number
8565E
a
856xE
measurement for Port 1, 2,
Keysight N5224A/25A Service Guide
"Removing