330 Chapter7
Replacing Major Assemblies
A16 Processor/Video Board and A16A1 Memory Board Assembly
A16 Processor/Video Board and A16A1
Memory Board Assembly
This procedure applies to:
8590 E-Series and L-Series spectrum analyzers
8591C cable TV analyzers
8594Q QAM analyzers
Before Replacing the A16 Processor/Video Board
Assembly or the A16A1 Memory Board Assembly
Frequency response and cal attenuator correction constants (for the
A12 amplitude control board assembly) are stored in battery-backed
RAM on the A16A1 memory board assembly. If replacing the A16A1
memory board, record these correction constants using the procedures
in Chapter 3 prior to removing the A16A1 memory board assembly.
If not replacing the A16A1 memory board, remove the board by prying
the board off the standoffs and place in a static-safe bag.
NOTE If you are unable to record the current correction constants, or they are
invalid, new correction constants must be generated after replacing the
A16A1 memory board. Refer to the “10 MHz Reference,” “Frequency
Response,” and “Cal Attenuator Error Correction” adjustment
procedures in Chapter 2 of this manual.
If valid correction constants can be removed from analyzer memory
before replacing the A16A1 memory board, record the correction values
using the procedures in Chapter 3.
CAUTION Use ESD precautions when performing this replacement procedure.
To Next Page
Loading...
Need help?
General
