Keysight Technologies Option 503 Service Manual page 70

Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
6. Referring to
Figure 2-8 A7 Midplane Board +12VD LED/Test Point 503
If yes:
If not:
7. With the instrument turned off remove the screws that attach the front
8. Without disconnecting any of the cables carefully lay the front panel
9. Referring to
The instrument does have a screen saver which can disable the display
backlight after a predefined period of time. If there is any question as to
whether or not this has been set by the user prior to the current failure,
and the "Inverter Enable" voltage measures too low, press a front panel
key and see if the voltage level increases to the expected level.
70
Figure 2-8, verify that the red +12VD LED is off.
Is the red +12VD backlight supply voltage fault LED off?
Proceed to step
Replace the A6 Power Supply assembly.
panel assembly to the instrument chassis.
assembly face down on the work surface.
Figure 2-9, verify the 3 voltage levels listed in
correct.
7.
N9030A PXA Signal Analyzer Service Guide
Table 2-2 are