Keysight Technologies N5244/5B Service Manual page 149

Troubleshooting
Measurement System Troubleshooting
5. If the 800 MHz signal is present, replace the associated mixer brick, A27 or
A28. Refer to
page
Checking the A24 IF Multiplexer Board
1. Locate each of the flexible RF cables at the output receivers of the IF
multiplexer board:
2. Disconnect the appropriate flexible RF cable from the output receiver to be
tested on the A24 IF multiplexer board.
3. Connect the spectrum analyzer to the open connector.
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, replace the A16 SPAM board. Refer to
"Removing and Replacing the A4–A17 Boards (For analyzers with serial
numbers prefixed MY/SG/US5150 and below)" on page
6. If the measured signal is not present, replace the A24 IF multiplexer board.
Refer to
page
Keysight N5244B/45B Service Guide
"Removing and Replacing the A27 and A28 Mixer Bricks" on
7-48.
— 2-port models
— Receiver A; W69
— Receiver R1; W72
— Receiver R2; W73
— Receiver B; W70
— 4-port models
— Receiver A; W69
— Receiver B; W70
— Receiver C; W72
— Receiver D; W73
— Receiver R; W71
the NOTE notice on page
"Removing and Replacing the A24 IF Multiplexer Board" on
7-41.
4-31. The measured signal on the
7-20.
4-55