620 Chapter14
Analyzer Messages
Interpreting Analyzer Messages
Before removing the A16 processor/video assembly, check all assemblies
that are identified in Table 14-2.
1. Turn the instrument power off and remove each assembly, one at a
time.
2. Turn the instrument on.
• If the ADC 2 V fault remains, the instrument preset at power-up
displays the error message.
• If the error message goes away, the last assembly removed is the
cause of the problem.
• If the error message remains after the removal of all related
assemblies, suspect the A16 processor/video assembly.
Check the ADC 2 V reference voltage on the A16 processor/video
assembly. Refer to 8590 Series Analyzers Component-Level Repair
Service Guide for the location of the 2 V reference circuit in the
analog-to-digital function block.
A 2 V reference failure can also be checked manually, using the service
diagnostics. Press
CAL, More 1 of 4, More 2 of 4, Service Diag, More 1,
2v REF DETECTOR.
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