Keysight N9038A MXE Service Guide 265
L.O. Synthesizer
A14 L.O. Synthesizer Assembly Troubleshooting
Assembly Status LEDs
There are three assembly status indicating LEDs on the A14 LO Synthesizer
assembly, the location of which are shown in
. When the instrument
is functioning properly all of these LEDs should be off.
To put the instrument into a known state in which all LEDs should be off tune
the instrument to a Center Frequency of 50 MHz and set the Span to 0 Hz. At
this point all of the LEDs should be off. If any of the LEDs are on see
for a possible cause.
Table 7-2
A14 L.O. Synthesizer Assembly Status LEDs
LED
Description
Cause for Fault
DS1
FPGA Programming Done
FPGA code is not uploading from assembly EEROM. Try reprogramming
FPGA by using the “FPGA Synchronization” instructions in
. If this LED is on the state of all other LEDs can
be ignored
DS2
Cycle Slipped
If DS3 is also on at the same time the status of this Led can be ignored
and troubleshoot the DS3 LED. If this LED is intermittently on by itself it
may not be a problem.
DS3
Frequency Unlocked
Verify that the 4800 MHz reference signal from the A16 Reference
assembly is of the correct frequency and power level (See
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Страница 216: ...216 Keysight N9038A MXE Service Guide RF Preselector Section RF Preselector Section Troubleshooting ...
Страница 268: ...268 Keysight N9038A MXE Service Guide L O Synthesizer A14 L O Synthesizer Assembly Troubleshooting ...
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