Diagnostic Leds - Keysight Technologies Option 503 Service Manual

LO 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
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
8-4.
Table 8-4 A16 Reference Assembly Diagnostic LEDs
LED Number Color
A16DS1 Yellow
A16DS6 Red
A16DS7 Green
A16DS8 Green
A16DS9 Green
A16DS10 Green
A16A1DS2 Red
A16A1DS3 Red
A16A1DS4 Green
A16A1DS5 Green
A16A1DS6 Yellow
N9030A PXA Signal Analyzer Service Guide
Description
When Program Code is loading
100 MHz Unlocked
Is the 100 MHz PLL Unlocked?
Is the 100 MHz VCXO working?
Is Internal 10 MHz Reference On?
Is the +15V Standby supply working?
When 2.4 or 4.8 GHz frequency is low
When 2.4 or 4.8 GHz frequency is high
Is the 2.4 GHz reference PLL locked?
Is the 2.4 GHz VCXO working?
When Program Code is loading
Figure 8-14. Table 8-4
Status
On=Loading code from EEPROM
Off=Ready
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)
On=Normal (locked)
Off=Fault (unlocked)
On=Yes (alive)
Off=Fault (not alive)
On=Yes (enabled)
Off=No (disabled; Ext Ref Mode)
On=Yes (+15 Standby supply is on)
Off=No
On=Fault (output frequency is low)
2 Blinks = 2.4 GHz Ref ALC unleveled
3 Blinks = 300 MHz Ref ALC unleveled
Off=Normal
On=Fault (output frequency is high)
2 Blinks = 4.8 GHz LO ALC unleveled
3 Blinks = 2.4 GHz LO ALC unleveled
Off=Normal
On=Normal (locked)
Off=Fault (unlocked)
On=Yes (alive)
Off=Fault (not alive)
On=Loading code from EEPROM
Off=Ready
lists
Table
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