Keysight Technologies X Series Service Manual page 66

Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
Figure 2-7 A1A2 Front Panel Interface Board LCD Backlight Inverter Control Voltages
Table 2-1
Signal
Brightness Control
Inverter Enable
Inverter Supply
a. On newer analyzers, the backlight is a string of LEDs, rather
66
Expected Backlight Inverter Control Voltage Levels
than a fluorescent tube. The brightness control voltage for the
LEDs ranges from 0 to 2.5VDC, rather than 0 to 3VDC. If the
A1A2 Front Panel Interface board installed is either
W1312-60042 or N9020-60033, expect this voltage to range
from 0 to 3VDC.
Expected Vol tage
a
0 to 3 VDC
>6 VDC
+12 VDC
Keysight N9010A EXA Service Guide