334 Chapter7
Replacing Major Assemblies
A16 Processor/Video Board and A16A1 Memory Board Assembly
After Replacing the A16 Processor/Video Board
Assembly
The A16A1 stores all the data necessary for analyzer operation
including the model identification and serial number. All that is
required is to power up the analyzer.
If the A16A1 memory board has lost this data for any reason, it will
be necessary to perform the routines outlined in “After Replacing the
A16A1 Memory Board Assembly.”
After Replacing the A16A1 Memory Board
Assembly
If no valid correction constants were saved before removal of the
A16A1 assembly, new correction constants must be generated.
• Perform “Reset the power-on units.” in Chapter 3.
• Perform the “10 MHz Reference” on 8590 E-Series, 8591Cs, and
8594Qs only, “Frequency Response,” and “Cal Attenuator Error”
adjustment procedures in Chapter 2 to generate new correction
constants.
• Perform the “Instrument Calibration after Reloading the
Correction Constants.” in Chapter 3.
If valid correction constants were saved before replacing the A16A1
assembly, restore the corrections to RAM memory and recalibrate
the analyzer using the following procedures from “Analyzer
Initialization.” and “Reloading the Correction Constants.” in
Chapter 3.
• “Reset the power-on units.”
• “Reload the timebase-correction constant.” and “Reload the
flatness-correction constants.”
• “Reload the A12 step-gain-correction constants.”
• “Instrument Calibration after Reloading the Correction
Constants.”
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