
Agilent N5161A/62A/81A/82A/83A MXG Signal Generators Service Guide
Troubleshooting
Troubleshooting Self Test 1105
1-25
18. Troubleshoot all items that did not function as expected.
•
May require firmware to be downloaded into instrument so FPGA code is correct.
CAUTION
Not upgrading the firmware to the current version could cause errors during instrument boot-up.
•
Only perform option Backup if CPU has been verified as the fault, else ignore error 617 Config error at this time.
•
If the front panel yellow standby LED is not functioning, go to
“The Green Front Panel Power Switch LED or Yellow Standby LED
to troubleshoot the error.
•
If the front panel green power switch LED is not functioning, go to
“The Green Front Panel Power Switch LED or Yellow Standby
LED is Not Working” on page 1-57
to troubleshoot the error.
•
If the front panel LCD display does not turn on, go to
“LCD Display Appears to be Inoperative (Dark)” on page 1-52
to troubleshoot
the error.
•
If the fans do not turn on, go to
“The Fans are Not Working” on page 1-64
to troubleshoot the error.
•
If any of the yellow debug LEDs, TP1 through TP5, remain on, replace the A5 CPU assembly.
•
If any of the power supply voltage LEDs are off, go to
“A1 Power Supply” on page 1-26
to troubleshoot the error.
•
If any of the FPGA LEDs are on, the signal generator has malfunctioned. Due to the design of the A3 RF and A5 CPU assemblies,
the failure of one can interfere with the functionality of the other. Replace the A5 CPU assembly.
— If all FPGA LEDs turn off, then the A5 CPU was the faulty assembly.
— If the any of the FPGA LEDs remain on, the A3 RF assembly is at fault and needs to be replaced.
•
If any of the Unlock LEDs are on, replace the A3 RF assembly.
•
If the yellow DS11 LED is not “blinking”, the most likely assembly at fault is the A3 RF assembly. Go to
“A5 CPU Assembly Troubleshooting” on page 1-33
to confirm that the A3 RF assembly is at fault.
19. After all boot-up routine errors have been successfully fixed, run a complete self test again.
Press:
Utility
>
Instrument Info
>
Self Test
>
Run Complete Self Test
.
Troubleshooting Self Test 1105
A self test 1105 failure can be caused by the A3 RF assembly or the A7 Micro Deck. The following procedure will help identify the defective
assembly.
1.
After running a complete self test, where self test 1105 failed, press
View Test Info.
2.
Scroll to self test 1304.
3.
Press
View Details
.
a.
If multiple lower level 1304 self tests failed, replace the A3 RF assembly.
b.
If only 1304 lower level self test 3.199 GHz Delta H/LB Detector failed, continue to step 4.
4.
Disconnect W12 from the A3 RF assembly.
5.
Connect the signal generator’s RF output through a 10 dB attenuator to a spectrum analyzer.
6.
Set up the spectrum analyzer:
a.
Press
Preset
.
b.
Set the reference level to +30 dBm.
c.
Set the CW frequency to 100 MHz.
d.
Set the span to 100 MHz.
7.
Set up the signal generator:
a.
Press
Preset
.
b.
Set the CW frequency to 100 MHz.
c.
Press
RF On/Off
to On.
d.
Press
AMPTD
>
+10 dBm
.
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