Keysight NFA Series Noise Figure Analyzers Service Guide 61
Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
Verify Video Signal Path Integrity
The video controller is located on the A4 Processor assembly and is routed to
the front panel LCD through a few interconnections. These interconnections
are:
— A4 Processor assembly to A7 Midplane Board
— A7 Midplane Board to A8 Motherboard assembly
— A8 Motherboard assembly to A1A2 Front Panel Interface assembly via W1
ribbon cable
— A1A2 Front Panel Interface to A1A3 LCD via A1W1 flex-circuit
If all of these connections are properly made and none of the cables are
damaged proceed to “Video Controller / Touch Screen Display
Troubleshooting”.
Video Controller / Touch Screen Display Troubleshooting
The video controller is located on the A4 Processor assembly. The video signals
that the controller outputs are LVDS. As described above, these signals are
routed to the touch screen display via the A7 Midplane Board, A8 Motherboard,
and A1A2 Front Panel Interface board.
On the A1A2 Front Panel Interface board the LVDS signals are buffered and
then sent to the touch screen display via the A1W1 Flex circuit.
The most likely cause for a video problem is the A4 Processor assembly;
however it could be the result of a defective touch screen display.
Initializations Did Not Complete
During the initialization of the Noise Figure Analyzer Application the following
messages will be displayed on the application splash screen:
— Checking for required services (1 of 7)
— Initializing License Services (2 of 7)
— Initializing Message Services (3 of 7)
— Initializing Hardware (4 of 7)
— Initializing Data Services (5 of 7)
— Initializing SCPI Services (6 of 7)
— Initializing Front Panel EEPROM Services (7 of 7)
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