Keysight Technologies N5222B, Service Manual

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4-16 Keysight N5290/1A Service Guide
N5290/91A Troubleshooting
N5292A Test Controller Troubleshooting
4-
Figure 4-7 Group 3 Test Point Details
Verifying A5 Test Set Motherboard Connectors, Cables, and Voltages
1. Power down the test set and remove the top and bottom covers. Refer to
Chapter 7 and “Removing the Outer Cover” on page 7-8 .
2. If not previously done, verify the continuity of the F1–F8 fuses. If
necessary, use the "Spare" fuse (F9). Refer to Table 4-1 on page 4-11 .
If the fuse was faulty was replaced, proceed to step 7 .
3. If the fuses are OK, inspect that the J3–J6 DC cables and J7–J11 head
digital control cables are installed properly. If not, power down the test
set, and re-seat the connectors. Then power up the test set, and recheck
the operation of the head(s) and test set. Refer to 7 .
4. If the fuses are OK, verify the voltages at the corresponding port’s TSMB
connector pins (J3–J6). (I.e., Port 1 (A), port 2 (B), port 3 (C), and port 4
(D).) Refer to Figure 4-8 on page 4-18 and Figure 4-10 on page 4-21 .
If no problem found or only one connector pin is failing the voltage check,
continue to step 5 .
Else, refer to “Verifying the A1 power supply” on page 4-17 and then to
step 6 .