Keysight N5171B EXG Service Manual page 74

Troubleshooting
Troubleshooting Assembly Level Problems
5. Refer to
6. Refer to
7. Refer to
8. Refer to
9. Refer to
10.Refer to
Keysight X-Series Signal Generators Service Guide
Figure 1-15. Measure A3J10-A21 and A3J10-A22; they should
have a voltage of +3 Vdc.
— If A3J10-A21 and A3J10-A22 have a voltage of +3 Vdc:
a. Replace the A3 RF assembly.
b. After replacing the A3 RF assembly, go to
"Post-Repair Procedures and Operational Performance
Verification.".
— If A3J10-A21 and A3J10-A22 do not have a voltage of +3 Vdc, go to
"A1 Power Supply Troubleshooting" on page 45
A1 Power Supply.
Figure 1-14. Measure A6J2-28; it should have a voltage of +5
Vdc.
— If A6J2-28 has a voltage of +5 Vdc, go to
— If A6J2-28 does not have a voltage of +5 Vdc, go to
Figure 1-14. Measure A6J1-3 and A6J1-4; they should have a
voltage of +12 Vdc.
— If A6J1-3 and A6J1-4 have a voltage of +12 Vdc, replace the A6
Front Panel Interface Scan board.
— If A6J1-3 and A6J1-4 do not have a voltage of +12 Vdc, go to
step 8.
Figure 1-15. Measure A3J6-3 and A3J6-4; they should have a
voltage of +12 Vdc.
— If A3J6-3 and A3J6-4 have a voltage of +12 Vdc, replace the W1
ribbon cable.
— If A3J6-3 and A3J6-4 do not have a voltage of +12 Vdc, go to
step 9.
Figure 1-15. Measure A3J10-B16; it should have a voltage of
+12 Vdc.
— If A3J10-B16 has a voltage of +12 Vdc:
a. Replace the A3 RF assembly.
b. Go to Chapter 4, "Post-Repair Procedures and Operational
Performance
— If A3J10-B16 does not have a voltage of +3 Vdc, go to
Supply Troubleshooting" on page 45
Supply.
Figure 1-14. Using an oscilloscope, turn the RPG knob and
measure A6J2-26 and A6J2-30. There should be a 4V square pulse. If
there is no 4V square pulse, replace the Keypad assembly.
step
Verification.".
to troubleshoot the A1 Power
Chapter 4,
to troubleshoot the
10.
step 7.
"A1 Power
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