310 Keysight N9038A MXE Service Guide
Reference Assembly
A16 Reference Assembly Troubleshooting
Figure 9-2 A16 Reference Board Assembly LEDs
Table 9-2 A16 Reference Assembly Status LEDs
LED LED Color Description Status
A16DS1 Yellow Program Code is loading On = Loading Code
Off = Ready
A16DS6 Red 100 MHz Unlocked On = 100 MHz VCXO Unlocked
1 Blink = 4.8 GHz Calibrator Unleveled
2 Blinks = 50 MHz Calibrator Unleveled
3 Blinks = 300 MHz LO Unleveled
Off = All Locked
A16DS7 Green 100 MHz PLL Locked On = Locked
Off = Unlocked
A16DS8 Green 100 MHz VCXO Status On = Yes
Off = No
A16DS9 Green 10 MHz OCXO Status On = On
Off = Off
A16DS10 Green +15V Standby Supply Status On = On
Off = Off
A16A1DS2 Red Frequency Low On = Frequency is Low
2 Blinks = 2.4 GHz Ref ALC Unleveled
3 Blinks = 300 MHz Ref ALC Unleveled
Off = Normal
A16A1DS3 Red Frequency High On = Frequency is High
2 Blinks = 4.8 GHz LO ALC Unleveled
3 Blinks = 2.4 GHz LO ALC Unleveled
Off = Normal
A16A1DS4 Green 2.4 GHz Reference Locked On = Locked
Off = Unlocked
A16A1DS5 Green 2.4 GHz VCXO Alive On = Yes
Off = No
A16A1DS6 Yellow Program Code Loading On = Loading Code
Off = Ready
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