Keysight Technologies N5290/1A PNA Series Service Manual page 110

N5290/91A Troubleshooting
N5292A Test Controller Troubleshooting
5. If one or more LEDs is faulty, verify the power out one of the LOPA ports.
The power should measure ~0 dB out of either port. If the power is not
correct, replace the LOPA board. If the power is correct, but the LED is
faulty, replace the LOPA board. Refer to
A2–A4 Boards" on page
Else, if the J61 connector was re-seated and the LEDs are OK, proceed to
"N5292A Functional Verification Procedure" on page
test set passes the Operation Check, then reinstall the outer cover.
6. If the LOPA board is working OK, but the test set is still faulty, proceed to
"Verifying the A3 LODA (LO Distribution Amplifiers)" on page
Verifying the A3 LODA (LO Distribution Amplifiers)
1. If the LODA LED is red indicating no power/unleveled (green LED indicates
LODA power is OK), verify J60 connector is seated correctly.
Else, power down the test set and reconnect the J60 cable. Power up the
test set and recheck the LEDs. If the LEDs are OK after re-seating the J60
connector, then refer to
page
If the J60 cable is seated and one or more of the LODA LEDs is red or and
one or more of the A5 TSMB LEDs are red, then verify the A5 TSMB
voltages. Refer to
and Voltages" on page
LODA board is faulty and needs to be replaced. Refer to
Replacing the A2–A4 Boards" on page
2. Else, if the LEDs are OK, but the test set is still faulty, continue to
"Verifying the A4 Phase Compensation Board" on page
4-24
7-14.
"N5292A Functional Verification Procedure" on
3-16.
"Verifying A5 Test Set Motherboard Connectors, Cables,
4-16. If the A5 TSMB voltages are OK, then the
"Removing and Replacing the
3-16. If the N5292A
"Removing and
7-14.
4-25.
Keysight N5290/1A Service Guide
4-24.