4-6 Keysight N5290/1A Service Guide
N5290/91A Troubleshooting
N5292A Test Controller Troubleshooting
4-
N5292A Test Controller Troubleshooting
If the Test Set is not operating properly, use the following procedures to aid in
isolating the problem. Refer to the
“N5292A Functional Verification
.
Power Supplies and Fans
1.
Verify the front panel switch is operational:
a.
When the front panel switch is off, the LED should be amber.
b.
When on the front panel DC Power LED should be on (white) when
the front panel switch is in the on position.
2.
AC Line voltage checks:
a.
Ensure the proper AC line voltage is present at the instrument line
cord.
b.
Remove the AC power cord from the instrument.
3.
Internal DC Power checks.
a.
Set the front panel power switch to OFF (LED is amber).
b.
Remove the cover and connect the AC power cord. No fans should
be on. Some DC LEDs should be on the test set mother-board
(TSMB).
c.
Set the power switch to the on position (LED is white). Both internal
power supply fans should be operational; the front panel DC Power
LED should be on. If the DC Power LEDs are off, measure the
+3.35Ds VDC pin on F6 and the+3.35Ds VDC pin on J11. Refer to
“Verifying the A5 Test Set Motherboard (TSMB)” on page 4-9
“Verifying the A1 power supply” on page 4-17
STOP!
This chapter assumes you have performed the N5290/1A system
checks in
Chapter 3, “System Tests and Adjustments,”
and have isolated
the N5292A test set as the problem instrument. If you have not isolated
the N5292A test set as the problem, then go back and perform the checks
N5292A test set controller troubleshooting can only be done by
Keysight-trained personal for procedures such as S-Parameters and
voltage checks and are
not
intended for N5290/1A system
troubleshooting.
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