Keysight Technologies N5222B, Service Manual

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Keysight N5290/1A Service Guide 4-17
N5290/91A Troubleshooting
N5292A Test Controller Troubleshooting
5. If the J3-J6 voltages are OK, and only one port is failing, and the head(s)
are working OK on other ports, then swap out a known good J3–J6 cable
and retest that port. Refer to Figure 4-8 on page 4-18 and to step 7 .
Else, refer to “Verifying the A1 power supply” on page 4-17 .
6. Replace the defective cable or TSMB. Refer to Chapter 7, “Repair and
Replacement Procedures,”
7. f the power supply fixture voltages are OK, proceed to “N5292A Functional
Verification Procedure” on page 3-16 . If the N5292A test set passes the
Operation Check, then reinstall the top and bottom covers. Refer to
Chapter 7 and “Removing the Cover” on page 7-8 .
Verifying the A1 power supply
1. Connect the power supply fixture to the suspect port and tighten finger
tight.
2. Power up the test set.
3. Probe each of the J3–J6 power supply fixture test points, verifying that
each voltage is /-0.2V of the values shown in Figure 4-8 on
page 4-18 . See also, Figure 4-3 on page 4-12 .
If the voltages are ≥ +/-0.2V of the values shown, then step 4 .
If the power supply fixture volts have already been verified, skip to step 4 .