Keysight NFA Series Noise Figure Analyzers Service Guide
289
L.O. Synthesizer/Reference Troubleshooting
A16 Reference Assembly Troubleshooting
Diagnostic LEDs
There are two sets of diagnostics LEDs on the A16 Reference Assembly. Six
LEDs are on the right side of the A16 Reference Main board and five LEDs are
on the A16A1 Reference Daughter board. Refer to
lists
the diagnostic LEDs and what their status indicates.
A blinking red LED typically indicates that an unleveled condition exists. The
number of blinks indicates what circuitry is unleveled, as indicated in
.
Table 8-4
A16 Reference Assembly Diagnostic LEDs
LED Number
Color
Description
Status
A16DS1
Yellow
When Program Code is loading
On=Loading code from EEPROM
Off=Ready
A16DS6
Red
100 MHz Unlocked
On=100 MHz VCXO is unlocked
1 Blink = 4.8 GHz calibrator unleveled
2 Blinks = 50 MHz calibrator unleveled
3 Blinks = 300 MHz LO_AIF unleveled
Off=Normal (locked)
A16DS7
Green
Is the 100 MHz PLL Unlocked?
On=Normal (locked)
Off=Fault (unlocked)
A16DS8
Green
Is the 100 MHz VCXO working?
On=Yes (alive)
Off=Fault (not alive)
A16DS9
Green
Is Internal 10 MHz Reference On?
On=Yes (enabled)
Off=No (disabled; Ext Ref Mode)
A16DS10
Green
Is the +15V Standby supply working?
On=Yes (+15 Standby supply is on)
Off=No
A16A1DS2
Red
When 2.4 or 4.8 GHz frequency is low
On=Fault (output frequency is low)
2 Blinks = 2.4 GHz Ref ALC unleveled
3 Blinks = 300 MHz Ref ALC unleveled
Off=Normal
A16A1DS3
Red
When 2.4 or 4.8 GHz frequency is high
On=Fault (output frequency is high)
2 Blinks = 4.8 GHz LO ALC unleveled
3 Blinks = 2.4 GHz LO ALC unleveled
Off=Normal
A16A1DS4
Green
Is the 2.4 GHz reference PLL locked?
On=Normal (locked)
Off=Fault (unlocked)
A16A1DS5
Green
Is the 2.4 GHz VCXO working?
On=Yes (alive)
Off=Fault (not alive)
A16A1DS6
Yellow
When Program Code is loading
On=Loading code from EEPROM
Off=Ready
Содержание N8973B
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